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Reprinted with permission of the University of Nebraska State Museum from:|
LaBerge, W. E. 1967. A revision of the bees of the genus Andrena of the Western Hemisphere. Part I. Callandrena (Hymenoptera: Andrenidae). Bulletin of the University of Nebraska State Museum 7: 1-316.
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This species known only from Texas is one of several with only two submarginal cells in the front wing. It differs in this respect from A. accepta to which it is closely allied. The female of verbesinae has a large yellow clypeal macula as in trimaculata and large parocular yellow maculae as in accepta and trimaculata. The vertex is not quite as high nor the genal areas as broad in either sex as in accepta. Also, A. verbesinae lacks a subgenal coronet and has a tooth at the apex of the hypostomal carina.
FEMALE. MEASUREMENTS AND RATIOS. — N = 1; length, about 12 mm; width, about 4 mm; wing length, 4.45 mm; FL/FW = 1.08; FOVL/FOVW = 2.81.
INTEGUMENTAL COLOR. — Black except as follows: clypeus with basomedial yellow macula with trilobed apical margin which equals about one-fifth clypeal area; parocular areas yellow to level of antennal fossae; tegulae testaceous; wing membranes slightly infumate, especially apically, veins reddish-brown; terga hyaline apically, yellowish becoming rufescent basally especially on first two terga, area basal 10 hyaline area and extreme base of all terga red, leaving dark. median band in some specimens; sterna hyaline apically; often red basally; tarsi rufescent, tibiae reddish but darker than tarsi; tibial spurs yellow, dark-tipped.
STRUCTURE. — Antennae missing in specimen available. Eyes one and one-half times as long as broad, subparallel. Malar space as in accepta or slightly shorter. Mandible (outer) in repose extends one-fourth of its length beyond middle of labrum, without ventrobasal lamella. Subgenal coronet lacking or poorly developed; hypostomal border at apex with a strong tooth-like process. Galea as in manifesta. Maxillary palpus short (last two segments missing in specimen available), in ratio of about 1.2:1.0:1.0:0.8:X:X (sic). Labral palpi missing in specimen available labia1 process short, more than three times as broad as long, weakly emarginate apicomedially. Clypeus flat medially, with round coarse punctures separated by about 3 puncture widths along midline and by about half a puncture width laterally, surface slightly dulled by reticular shagreening. Supraclypeal area with small round punctures separated by half to one puncture width, surface shiny. Genal area equals less than one and one-half times width of eye in profile, with small crowded punctures separated mostly by half a puncture width throughout, surface shiny. Vertex moderately tall, above lateral ocellus equals about 2 ocellar diameters, closely punctate except just lateral of lateral ocelli, surface moderately dulled by fine dense tessellation. Face with weak longitudinal rugulae and closely spaced interrugal punctures, shiny; inverted impressed triangle below median ocellus impunctate, shagreened. Facial fovea about half as long as eye or slightly longer, rounded above, narrow below but not markedly pointed.
Pronotum, mesoscutum, and scutellum as in accepta but punctures slightly more crowded. Propodeal enclosure with extremely fine transverse rugulae near middle, irregular basally, surface shagreened, dull; outside of enclosure as in accepta. Mesepisternal punctures separated by half to one puncture width, surface dulled by dense reticular shagreening. Metepisternum impunctate below, shiny. Middle basitarsus no broader than hind basitarsus, sides almost parallel. Hind tibia as in accepta. Tibial spurs normal but interior spur of hind tibia slightly sinuate. Front wing with pterostigma as in accepta; with two submarginal cells; vein 1st m-cu meets second submarginal cell 2 to 3 vein widths beyond its base.
Metasomal tergum 1 with apical area distinctly impressed, basal area with punctures separated by half to one puncture width, surface shiny medially, shagreened peripherally. Terga 2 and 3 similar but punctures slightly sparser, surfaces duller, and apical area less distinctly impressed. Terga 4 and 5 with apical areas scarcely impressed, basal area punctures widely separated, surfaces dulled by 5ne, dense reticular shagreening. Pygidial plate quite pointed, rather narrow. Sterna 3-6 as in accepta; sternum 2 with scattered punctures basally.
VESTITURE. — In general hair ochraceous to slightly reddish on thoracic dorsum. Distribution and type of hairs as in accepta except is follows: thoracic dorsum with hairs shorter; tergal basal areas with hairs weak, long and mostly erect; tibial scopal hairs dark ochraceous.
MALE. MEASUREMENTS AND RATIOS. — N = 1; length about 12 mm; width about 3.5 mm; wing length, 4.15 mm; FL/FW = 1.13; FS1/FS2 = 2.24.
INTEGUMENTAL COLOR. — As in accepta except as follows: clypeus yellow except narrow apical border and extremely narrow posterior border; parocular yellow maculae extend to top margins of antennal fossae; wing membranes moderately infumate, especially apically; tarsi and apical one-third or more of tibiae reddish-yellow; terga and sterna vary as in female.
STRUCTURE. — Antennae short, reaching tegulae in repose; scape subequal to flagellar segments 1 plus 2; flagellar segment 1 longer than segments 2 plus 3 which are subequal to each other and each slightly shorter than segment 4. Malar space, mandibles and galeae as in female but mandibles slightly longer. Maxillary palpal ratio about 1.4:1.0:0.8:1.0:0.7:1.3. Labial palpal ratio about 1.7:1.0:0.5:0.6. Labral process as in female. Clypeus protruding distinctly below lower level of eyes, sculptured as in female. Supraclypeal area, genal area, vertex, and face as in female. Thoracic sculpture as in female but lateral surfaces of propodeum with more abundant punctures.
Metasomal terga 1-5 with apical areas deeply impressed, apex not noticeably reflexed, basal area punctures coarse, separated mostly by less than half a puncture width on all terga, surfaces dulled by coarse shagreening. Terga 6 and 7 with apical areas less impressed. Sterna 2-5 much as in female but punctures more abundant basally. Sternum 6 densely punctate, with apical margin convex or almost straight, not reflexed or emarginate. Sterna 7 and 8 and genital capsule as figured (Figs. 25-29); note blunt gonostylus, large blunt penis valves, U-shaped emargination of sternum 7 and laterally angulate apex of sternum 8.
VESTITURE. — In general pale ochraceous or cinereous. Distribution and type of hairs as in accepts but basal tergal hairs long, weak, mostly erect.
TYPE MATERIAL. — The female holotype (USNM No. 18, 119), three female and seven male paratypes (USNM) were collected at Cotula, Texas, by F. C. Pratt, May 12, 1906, on Verbesina encelioides. An additional male paratype (USNM) was collected by J. C. Crawford, May 12, 1906, on Verbesina encelioides. Two additional paratypes (AMNH) are as follows: 1 male, 1 female, San Antonio, Texas, June 6, 1905 by J. C. Crawford.
Andrena verbesinae Viereck and Cockerell, 1914, Proceedings of the U.S. National Museum, vol. 48, p. 1; Lanham, 1949, University of California Publications in Entomology, vol. 8, p. 199.
Updated: 2021-05-11 13:25:22 gmt