1938] 
The Genus Lithurgus 
153 
tibia in two distinct rows, the surface between polished, 
those on the hind tibia scattered, the surface polished be- 
tween them ; apical margins of abdominal segments slightly 
depressed, more so toward sides. 
Puncturation : Close and fine on face, vertex and on pleura 
above ; coarse and rather sparse on pleura below and on the 
shining clypeus; cheeks finely and quite closely punctate 
above, rather coarsely so below ; mesonotum rather coarsely 
striately rugose, especially medially, becoming finely rugose 
or subpunctate toward prothorax; scutellum rather finely 
rugose; basal segments of abdomen impunctate medially, 
becoming rather finely and closely punctate laterally, and 
the more apical segments quite distinctly punctate, the fifth 
with moderately coarse and distinctly separated punctures. 
Color: Black; tegulae and wing nervures piceous; an- 
tennae beyond the basal joint of the flagellum ferruginous; 
wings subhyaline, faintly clouded apically ; spurs yellow. 
Pubescence: White at sides of face, around antennae, on 
cheeks, pleura, propodeum, dorsum of thorax anteriorly, 
and on legs; white, but thin and inconspicuous on vertex; 
mesonotum, scutellum and basal abdominal terga almost 
bare, fifth tergum with scattered erect dark hairs, the 
apical one with dense fuscous pubescence; second to fifth 
terga with entire and conspicuous white apical fasciae ; 
sterna also with narrower but entire white apical fasciae be- 
neath the reddish or orange scopa. 
Male. — Size: Length 10 mm.; breadth of abdomen 3 
mm. ; anterior wing 7 mm. 
Structure: Face with breadth above about equal to length ; 
eyes convergent below ; lateral ocelli slightly nearer edge of 
vertex than to eyes; cheeks subequal in width to eyes; 
clypeal margin nearly straight, entire ; labrum with a basal 
median conical robust tubercle ; supraclypeal area flattened, 
impunctate medially, polished; basal joint of flagellum sub- 
equal to pedicel and to the second joint ; mandibles 3-dentate ; 
tibiae finely tuberculate or rugose on outer faces, the meta- 
tarsi slender, shorter than their tibiae; claws deeply cleft, 
a small but distinct pulvillus between them ; apical margins 
of abdominal terga slightly depressed, especially toward 
sides. 
