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Trachusa crassipes (Cresson, 1878)
Anthidium crassipes Cresson, 1878; Heteranthidium crassipes (Cresson, 1878); Anthidium crassipes; Heteranthidium crassipes

Life   Insecta   Hymenoptera   Apoidea   Megachilidae   Trachusa
Subgenus: Heteranthidium

Trachusa crassipes female top
photo by John Pascarella, jbp014@shsu.edu; 936-294-1458 · 1
Trachusa crassipes female top

Click on map for details about points.

Overview
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 10 mm.; black, with yellow maculations; clypeus except the narrow, apical margin, a triangular maculation on supraclypeal area, lateral facial maculae reaching top of eye, and a pair of small, oblong spots on each side of vertex, yellow; a small yellow spot on tubercle; anterior third of tegulae, an L-shaped mark on scutum extending from anterior margin to axillae, the entire axillae, and posterior margin of scutellum, yellow; pleura with a large, anterior, yellow blotch; mandibles, upper part of face in large part, and median basal part of scutellum, black; coxae, trochanters and femora largely ferruginous, tibiae and basitarsi more yellowish, the more apical tarsal segments becoming reddish; spurs testaceous; abdominal terga with entire, transverse, yellow bands, these gradually and strongly narrowed toward midline, filling entire disc at each side, the apical depressed rims narrowly black; tergum 6 entirely black; face slightly longer than distance between eyes; eyes very slightly convergent below; lateral ocelli subequally distant from eyes and margin of vertex; cheeks much narrower than eyes; clypeus only slightly convex, rather short, apical margin with a shallow, median, emarginate area and very minute crenulations on each side; mandibles with very low, scarcely perceptible teeth on the dentate margin; tegulae somewhat shining, very minutely and closely but quite deeply punctate; wings lightly infuscated, veins piceous; tubercles strongly carinate; hind basitarsi nearly as broad as their tibiae, length no more than twice the greatest breadth; pubescence very short and inconspicuous, entirely pale, barely visible on dorsum of thorax and abdominal terga, more dense on face, cheeks and pleura, but still quite short and thin; scopa entirely pale ochraceous; tergum 6 in large part covered with dense, appressed tomentum; punctures quite coarse, deep and distinct, close and rather fine around antennae, somewhat more coarse and distinct on maculated areas, and more widely separated on vertex, becoming close on cheeks below; punctures rather coarse and quite close on pleura anteriorly and above, becoming finer and closer below and posteriorly, those on scutum and scutellum uniformly very close, coarse and deep, almost crowded; abdominal terga 1-3 quite coarsely, deeply and uniformly punctate, punctures slightly separated near midline, becoming somewhat closer laterally and closer on terga 4 and 5, tergum 6 with minute and densely crowded, barely visible punctures.

MALE—Length 9 mm.; black, with yellow maculations; clypeus, mandibles, apical third of supraclypeal area, scape below, and lateral facial marks extending narrowly to top of eye, yellow; vertex with a pair of small, oblong, yellow spots on each side and a smaller, more indefinite spot on upper part of cheeks; scutum with a pair of lateral, yellow bands, extending from median third of anterior margin along side to axillae, the axillae and postero-lateral half of scutellum yellow, median half black; an oblong, yellow spot on pleura anteriorly; tubercles yellow in large part, tegulae with a pale yellow, anterior blotch; coxae, trochanters and femora ferruginous, tibiae more yellowish, basitarsi pale yellow, and the more apical tarsal segments more ferruginous; spurs pale yellow; abdominal terga 1-6 with transverse yellow bands, these broad laterally, strongly narrowed medially, that on tergum 1 slightly interrupted; apical margin of terga narrowly depressed and shining, reddish in color; band on tergum 6 occupying two-thirds of plate, tergum 7 narrowly yellow apically, the remainder ferruginous; face slightly longer than distance between eyes above; eyes very slightly convergent below; lateral ocelli slightly nearer eyes than to margin of vertex; cheeks somewhat narrower than eyes; mandibles 3-dentate, teeth black in contrast with the yellow outer face; clypeus slightly protuberant, apical margin nearly straight but with a barely perceptible, median, emarginate area delimited by a pair of minute tubercles; tegulae somewhat shining, with very fine and rather close but indefinite punctures; wings subhyaline, veins more piceous; pubescence entirely pale, very short and thin, somewhat yellowish above, very inconspicuous on dorsum of thorax and on abdominal terga, more dense around antennae and on cheeks, pleura and propodeum; punctures deep and distinct, close in large part, quite fine below ocelli, somewhat more widely separated on maculated areas and well separated and rather fine on vertex, becoming close and fine on cheeks below; rather coarse and well separated on pleura anteriorly, adjacent to maculation, becoming fine and close below; coarse and uniformly close over scutum and scutellum, intervening lines somewhat shining; front basitarsi very small and inconspicuous, mid basitarsi elongate, narrow, slightly curved, fully twice as long as hind basitarsi which are much shorter than following joints combined and not much more than one-third length of tibia; abdominal terga shining, punctures deep and distinct, well separated medially on terga 1-4, becoming quite close and coarser at extreme sides, quite close on terga 5 and 6; tergum 7 nearly straight apically, very slightly convex; sterna 1-3 largely exposed, 2 and 3 with dense pubescence which becomes more elongate toward sides; sterna 4-8 retracted and hidden, form as shown (fig. 8); genital armature as shown.

DISTRIBUTION—North Carolina to Florida, July.

Names
Scientific source:

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Updated: 2024-04-24 03:14:18 gmt
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