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© Copyright source/photographer
· 7
Andrena ilicis, F, face, Maryland, Somerset |
© Copyright source/photographer
· 7
Andrena ilicis, F, side, Maryland, Somerset County |
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© Rebekah Andrus Nelson
· 1
Andrena ilicis, female, face |
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Overview |
IDENTIFICATION TIPS: Smallish, similar to Subgenus Trachandrena in that it often has a raised line or carina across the tip of the propodeal triangle where it meets the rim of the dorsal surface. However, it does not have deeply recessed facial fovea. Also useful is the fact that the tibia and tarsal segments often are imbued with a reddish orange coloration.
Reprinted with permission of the American Entomological Society from:
LaBerge, W. E. 1971b. A revision of the bees of the genus Andrena of the Western Hemisphere. Part IV. Scrapteropsis, Xiphandrena, and Rhaphandrena. Transactions of the American Entomological Society 97: 441-520.
Please report text errors to: leah at discoverlife dot org.
This is a small species from southeastern United States that is closely related to A. imitatrix. A. ilicis is similar to imitatrix in having a flat sixth sternum in the male and the female lacking ridges on the under surface of the hind femur. However, the female of ilicis can be distinguished from that of imitatrix by the propodeal corbicula having simple internal hairs and being incomplete anteriorly, the propodeum outside of the dorsal enclosure being more coarsely sculptured, the narrower hind tibiae and the form of the rugulae on the under surface of the genal area. The male of ilicis is very much like that of imitatrix with which it has been confused, but ilicis males have more slender hind tibiae (not swollen as in imitatrix), a more coarsely sculptured propodeum, and slightly longer antennae. The male is here described for the first time.
FEMALE. MEASUREMENTS AND RATIOS. — N = 20: length. 8-ll mm; width, 2.5-3.5 mm; wing length, M = 3.25 ± 0.137 mm; FL/FW, M = 1.13 ± 0.004; FOVL/FOVW, M = 3.48 ± 0.093.
INTEGUMENTAL COLOR. — Black except as follows: flagellar segments 2-10 brown below: mandible with apical fourth to half rufescent; wing membranes hyaline, somewhat infumate apically, veins brown to red: terga 1-4 with apical areas translucent: basitarsi and hind tibiae often red or orange.
STRUCTURE. — Antennal scape length equal to first three flagellar segments or slightly more; flagellar segments as in imitatrix. Eyes each about 3.7 times as long as broad, inner margins parallel. Malar space, mandible and galea as in imitatrix. Maxillary palpus as in imitatrix but segmental ratio about 0.9: 1.0: 0.9: 0.9: 0.8: 0.9. Labial palpus as in imitatrix but segmental ratio about 1.0: 0.6: 0.5: 0.6. Labrum as in imitatrix but process always distinctly emarginate apically. Clypeus as in imitatrix. Supraclypeal area with minute, crowded punctures, surface dull to moderately shiny. Genal area about as broad as eye in profile, without rugulae, with small round punctures separated by half to one puncture width or less. surface shiny to moderately so; below head with longitudinal rugulae which do not turn inwards towards hypostomal carinae. Vertex and face above antennal fossae as in imitatrix. Facial fovea extends down to just below level of lower margins antennal fossae, relatively narrow, shallow, inner margins not clearly defined in upper half, usually separated from lateral ocellus by less than one ocellar diameter.
Pronotum as in imitatrix but shinier, punctures sparser and shagreening finer. Mesoscutum with posteromedian area with small round punctures separated mostly by two to four puncture widths, elsewhere by one-half to one puncture width or slightly more, surface dulled by fine tessellation. Scutellum with punctures separated by one-half to one puncture width or slightly more, surface shiny, unshagreened or with delicate reticular shagreening. Propodeum with dorsal enclosure as in imitatrix with rugae more distinctly longitudinal; dorsolateral and posterior surfaces coarsely rugatulopunctate; lateral surface with fine but distinct rugae in posterior half or more; surfaces finely tessellate. Mesepisternum with distinct round punctures in posterior half, becoming rugatulopunctate anteriorly, surface moderately dulled by fine reticular shagreening. Hind femur as in imitatrix but narrower and broadest at apex. Wing venation as in imitatrix.
Metasomal tergum 1 with apical area punctures separated mostly by about half a puncture width or somewhat more, basal area punctures separated mostly by two to four puncture widths, surface shiny, unshagreened. Terga 2-4 with apical area punctures slightly smaller and more crowded than in basal areas, basal area punctures separated mostly by two to three puncture widths, surfaces shiny, unshagreened or delicately so. Pygidial plate is in imitatrix. Sterna 2-5 with basal areas with crowded punctures, surface dulled by fine reticulotransverse shagreening.
VESTITURE. — Generally as in imitatrix except as follows: corbicula without plumose hairs anteriorly, internal hairs simple; trochanteral flocculus complete but week; terga 2-4 with narrow apical white pubescent fasciae of dense decumbent hairs, often interrupted medially on terga 2 and 3.
MALE. MEASUREMENTS AND RATIOS. — N = 20; length, 7-9 mm; width, 1.7-2.0 mm; wing length, M = 3.03 ± 0.137 mm; FL/FW, M = 1.17 ± 0.008; FS1/FS2, M = 0.91 ± 0.019.
INTEGUMENTAL COLOR. — Black with same exceptions as in female.
STRUCTURE. — Antennae moderately long, in repose reaching back to middle of propodeum; scape length equals first two and one-half to two and three-fourths flagellar segments; flagellar segment 1 no longer than segment 2 and usually slightly shorter, remaining segments as in imitatrix. Eyes each three and three-fourths as long as broad or slightly longer, inner margins converging slightly towards mandibles. malar space, mandible and galea as in female. Maxillary palpus as in female. Labial palpus as in female but segmental ratio about 1.0: 0.7: 0.6: 0.7. Labrum as in imitatrix. Clypeus as in female but median impunctate line usually absent. Supraclypeal area, vertex and face above antennal fossae as in female. Genal area laterally as in female but with longitudinal rugulae, fine punctures and delicate shagreening present, underneath head as in female.
Thoracic sculpturing as in female except as follows: mesoscutal punctures often more crowded; scutellum not so shiny: propodeum often with dorsal enclosure with rugae irregular. Wing venation as in female. Hind femur with apex simple, not at all inflated in apical third, broadest at apex.
Metasomal terga 1-5 sculptured as in female terga 1-4 except apical areas with punctures not much if any denser than basal areas. Sterna 2-5 with narrow apical areas impunctate. basal areas sparsely punctate, surfaces dulled by fine reticular shagreening. Sternum 6 flat, broadly emarginate apically.
Terminalia as in figures 12-16. Note the following: sternum 7 only weakly emarginate; sternum 8 with apical part strongly constricted below tip: gonocoxite with dorsal process straight, blunt-tipped.
VESTITURE. — White to cinereous, thoracic dorsum often pale ochraceous. Generally disposed as in female but without pollen-collecting hairs and terga 2-5 with dense apical fasciae broadly interrupted medially.
Reprinted with permission from: Mitchell, T.B. 1960. Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 141.
FEMALE. — Length 8 mm.; face very slightly longer than broad; clypeus convex, projecting about one-third below suborbital line, rather shining between the deep, distinct, moderately coarse punctures, which are well separated medially, becoming rather close at extreme sides, without a definite impunctate line; facial foveae occupying most of space between eyes and ocelli above and only slightly narrowed below, covered with whitish tomentum; space between margin of vertex and lateral ocelli subequal to their diameter; cheeks subequal to eyes in width, somewhat shining, punctures along margin of eye minute but rather distinct and close, becoming rather coarse posteriorly, those on vertex laterally fine, well separated but not sparse, surface somewhat shining; malar space very short; basal segment of flagellum slightly shorter than 2nd and 3rd combined, process of labrum subtriangular, apex rather narrowly truncate; pubescence of head, thorax and legs whitish, becoming somewhat yellowish on dorsum of thorax laterally and on the more apical portions of legs; punctures of scutum deep and distinct, well separated but not sparse over median area, closer between notaulices and tegulae, surface smooth but rather dull, those on scutellum slightly coarser, well separated; pleura rather coarsely rugose anteriorly, becoming smoother and more distinctly punctate posteriorly; dorsal area of propodeum oblique, triangle very coarsely rugoso-striate; propodeal corbicula rather short, poorly developed, without a distinct anterior fringe, whitish-ochraceous; trochanteral floccus thin and poorly developed; somewhat elongate, whitish; hind tibiae quite slender, apex only slightly broader than basitarsi, bright ferruginous, scopa rather dense, hairs of moderate length, simple, entirely whitish-ochraceous; fore and mid basitarsi quite slender, slightly narrower than their respective tibiae, mid and hind basitarsi ferruginous; 2nd submarginal cell very short, receiving 1st recurrent about one-third from apex; abdominal terga smooth and shining, punctures deep and distinct, but quite fine and close, apical impressed areas narrow, occupying medially hardly one-third length of discs, very narrowly yellowish-hyaline along rims, discal pubescence very sparse, short, obscure, apparently entirely pale, terga 2-4 with narrow, white, apical fasciae, widely interrupted medially on 2 and 3, tergum 5 with a brownish-fuscous fimbria.
TYPES. — Holotype: Female, Ivanhoe, N. C., April 12, 1945 (Mitchell, on Ilex) [author's coll.]. Paratypes: NORTH CAROLINA: 1 F, Ivanhoe, May 3, 1945; 2 FF, Willard, N. C., April 6, 1951 (on Crataegus); 1 F, Holly Shelter, Mar. 19, 1953 (on Prunus); 1 F, Wayne Co., May 7, 1954 (on Batodendron) (all Mitchell); 1 F, Waynesville, June 25, 1952 (W. A. Stephen); 2 FF, Raleigh, May 1, 1940 and May 24, 1941. MARYLAND: 1 F, Beltsville, June 28, 1917 (L. F. Jackson, on Castanea pumila). GEORGIA: 1 F, Thomaston, May 1, 1937; 1 F, Atlanta, May 8, 1948 (both P. W. Fattig). VIRGINIA: 3 FF, Arlington, May 27, 1951; 1 F, Dunn Loring, June 2, 1951 (K. V, Krombein). FLORIDA: 1 F, Levy Co., Apr. 3, 1954 (H. V. Weems, Jr.); 1 F, Gulf Hammock, Apr. 23, 1952 (J. R. Vockeroth). OHIO: 1 F, Scioto Co., June 17, 1944 (D. L. & J. N. Knull).
These paratype specimens are located in the U. S. National Museum, the State Plant Board of Florida, the Canadian National Museum, Ohio State University, and the author's collection.
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Updated: 2024-04-19 19:28:41 gmt
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