|
Reprinted with permission from: Daly, H. V. 1973. Bees of the genus Ceratina in America North of Mexico (Hymenoptera: Apoidea). University of California Publications in Entomology 74: 1-114. The Regents of the University of California. Published by the University of California Press.
Ceratina shinnersi Daly, new species
Allotype female.—Measurements and ratios: wing, 3.3 mm; hamuli, 5; eye, 83:95:87:80; clypeus, 43 × 70:23:65; interocellar, 20:31:20:35, Ø 12.0; frontal carina, 45; malar area, 0 × 35; interalveolar, 23:20;36:40, Ø 15; antenna, 35:10:10:5:5:6, Ø 11; subpleural signum, 10.0 × 2.5.
Structure: Head rounded in cephalic view; eyes convergent below, narrowly rounded above, subtruncate at malar area; frontal carina simple, poorly defined between alveolae, sulciform beneath median ocellus; vertex and supraorbital area limited posteriorly by preoccipital ridge without carina; median portion of hypostomal carina when viewed laterally of low uniform height, terminating anteriorly without a tooth, when viewed ventrally angle between median and lateral portions about 120°. Basitibial plate spiniform, its elevated apex at basal 0.28 of tibial length. Metasoma widest at segments 3-4; gradulus of tergum 4 terminating laterally beyond and below spiracle at a distance of 2.5 spiracle lengths; tergum 6 with median central area depressed, giving notched lateral profile; gradulus of sternum 2 arcuate, gradulus of sternum 3 slightly arcuate.
Sculpture and vestiture: Head shiny between punctures, largely impunctate on clypeal disc, lower supraclypeal area, subantennal area, convex portion of alveolocellar area and in narrow band behind eye; sparsely punctured on mandible base and gena; elsewhere with fine to medium punctures often more than a puncture width apart and with largely simple setae; punctures closer in interalveolar, supraorbital, and paraocular arena and vertex; sparse setae longer in interalveolar and postgenal areas, vertex, labral disc, and apically on mandible. Sides of pronotum finely punctured about a puncture width apart or less, impunctate area before pronotal pit; scutal disc shiny, virtually impunctate except sparsely along line, flue punctures marginally and as close as a puncture width apart laterally and on axilla; scutellar disc sparsely punctate, fine punctures becoming closer and almost contiguous laterally and posteriorly; metanotum finely punctured throughout, less than a puncture width apart; mesopleuron with medium punctures generally less than a puncture width apart laterally, becoming more widely spaced posteroventrally, setae narrowly plumose, becoming longer posteroventrally; hypoepimeral area sparsely punctate; metapleuron finely punctured, usually less than a puncture width apart; propodeal triangle reticulate rugose; angle of propodeum impunctate, minutely coriaceous; sides finely punctured, becoming closer and smaller laterad, with long erect, narrowly plumose setae. Metasomal tergum 1 finely punctured on dorsal surface about a puncture width apart, virtually impunctate on anterior surface; terga 2-5 with scattered fine punctures on pregradular area near gradulus, postgradular punctures fine and becoming denser to about a puncture width apart laterally and apically, each with a short appressed simple seta; ground shiny, but subapically minutely roughened on terga 2-4; tergum 5 finely and sparsely papillate; tergum 6 finely punctured about a puncture width apart, ground uneven with basal papillae becoming rugulose laterally and apically; setae short, simple. Sterna finely punctured, more than a puncture width apart; setae simple, fine, suberect, dense at apex of abdomen; setae of wax glands appressed.
Color: Head and thorn dark reddish brown (ISCC-NBS 44) with faint blue-green reflections; abdomen reddish brown with greenish reflections; metallic colors lacking on labrum, mandibles, mesoscutal dine, and wax glands. Ivory marks: broad amygdaliform on clypeus, extending almost full length and widest near apex; spots at bases of all tibiae, being largest on metatibia; pronotal lobes. Antennae fuscous, lighter beneath; legs dark testaceous without metallic reflections; wing membrane hyaline, venation and teguln testaceous. Body setae white.
Holotype mala—Measurements and ratios: wing, 3.05 mm; hamuli, 5; eye, 80:82:72:65; clypeus, 42 × 57:18:60; interocellar, 20:28:15:32, Ø 13; frontal carina, 40; malar area, 0 × 30; interalveolar, 22:12:30:35, Ø 13; antenna, 25:10:10:5:6:10, Ø 13; subpleural signum, 12 × 2.5.
Structure: Head rounded in cephalic view; eyes convergent below, rounded above, broadly rounded at malar area; frontal carina simple, distinct between alveolae, sulciform beneath median ocellus; vertex and supraorbital area limited posteriorly by a sharp preoccipital ridge with a fine carina; median portion of hypostomal carina when viewed laterally of low uniform height, terminating anteriorly without a tooth, when viewed ventrally lateral portion arcuate. Ventral profile of metatrochanter obtusely angled; width of metafemur at tooth 0.55 length, tooth pointed at apex, obtuse, 100° angle, facet evident and with minute hairs, proximal ventral edge of tooth with medium, straight, narrowly plumose setae becoming short at tooth’s apex (resembles fig. 22m). Metasoma widest at segment 4; gradulus of tergum 4 terminating laterally beyond spiracle at a distance of 1.3 spiracle lengths; tergum 6 without median subapical protuberance; dorsal view of apical plate width equals twice length, narrowly rounded; sternum 6 with two median teeth (resembles 13!). Genitalia presumed to be similar to fig. 28b).
Sculpture and vestiture: Head shiny between punctures, largely impunctate on clypeal disc, subantennal area, most of convex portion of alveolocellar area and in narrow band behind eye; sparsely punctured on mandible base with minute and fine punctures; gena with fine punctures more than a puncture width apart; elsewhere with fine to medium punctures about a puncture width apart or more and with largely simple setae; punctures closer in interalveolar area, sparser in ocellorbital area; sparse setae longer in interalveolar and postgenal areas, vertex, and posteriorly on mandible. Sides of pronotum finely punctured about a puncture width apart, impunctate area above pronotal pit extending to beneath dorsolateral angle; scutal disc shiny, impunctate areas mesad of parapsidal lines, medium punctures marginally and about a puncture width apart or less laterally and on axilla; scutellar disc moderately punctate, fine punctures becoming less than a puncture width apart laterally and posteriorly; metanotum finely and almost contiguously punctured throughout; mesopleuron with medium punctures about a puncture width apart or less laterally, becoming more widely spaced posteroventrally, medium plumose setae; hypoepimeral area impunctate above scrobe; metapleuron finely punctured, less than a puncture width apart; small impunctate area before metapleural pit; propodeal triangle reticulate rugulose, longitudinal carinulae becoming indistinct laterally; angle of propodeum impunctate, minutely coriaceous; sides finely punctured, becoming contiguous and smaller laterad, with erect plumose setae. Metasomal tergum 1 virtually impunctate on dorsal and anterior surfaces; terga 2-6 with scattered fine punctures on pregradular area near gradulus, postgradular punctures sparse on discs, fine and irregularly about a puncture width apart elsewhere, each with a short appressed simple seta; ground shiny, but minutely roughened on terga 5-6; tergum 7 finely punctured about a puncture width apart with shiny round, apical plate above with long, plumose hairs extending beyond plate. Sterna 1-5 finely punctured, about a puncture width apart; setae fine, suberect, narrowly plumose, longer subapically on each sternum.
Color: Head and thorax dark reddish brown (ISCC-NBS 44) with faint metallic blue-green reflection; abdomen similar but paler with greenish reflections; metallic colors lacking on mandibles which are dark brown. Ivory marks: broad hat-shaped on clypeus, extending full length and width; rectangular spot on labral disc; spot at anterior base of mandible, apex of fore femur, and bases of all tibiae, being largest on metatibia; pronotal lobes. Antennae dark fuscous, lighter beneath; legs dark testaceous, not metallic, tarsi apically testaceous; wing membrane hyaline, venation and tegula testaceous. Body setae white.
Male compared with illustrations of other specimens: metafemur and metatrochanter (fig. 22m), sternum 6 and apical plate (fig. 13f); genitalia not dissected, but illustrated from another specimen (fig. 28b).
Named in memory of Lloyd H. Shinners, who collected the type series as a part of a survey of the anthophilous Hymenoptera of Texas (Daly, 1972).
Ceratina shinnersi is closely allied to C. nanula and distinguishable only by characters of the male and the geographic distribution. Throughout the range of C. nanula from British Columbia to the mountains of western Texas, the hind femoral tooth of the male is rounded and bears hairs which curve distad and are longest at the tooth’s apex (fig. 22a—l). The femoral tooth of C. shinnersi is pointed and with proximal, straight hairs which are shortest at the tooth’s apex (fig. 22m—n). Both sexes of C. shinnersi are less melanized: bodies with more greenish reflections and the legs nonmetallic reddish brown. C. nanula enters western Texas apparently at higher elevations (Brewster Co.: Alpine., 9 mi 5; Chisos Mts. Jeff Davis Co.: Davis Mts.; Ft. Davis, 20 mi N; Valentine). Populations with the features of C. shinnersi occur immediately to the south and east at lower elevations (Brewster Co.: Santa Elena Canyon; Hot Spgs. Terrell Co.: Sanderson) and eastward in Texas to the oak-hickory forest belt (fig. 21). The abrupt change in structure and color in western Texas is the basis for recognizing C. shinnersi as a species distinct from C. nanula.
|
