36 UNIVERSITY OF COLORADO STUDIES 
a longitudinal pale reddish line. I do not find that this was published; it differs from 
all the species known to me, and is probably new. 
Trigona mellicolor Packard 
A small species; head and thorax honey color; head large, broader than thorax; 
mandibles not dentate; metathorax darkened, its base black; wings hyaline, nervures 
pale honey color; legs honey color. Abdomen missing in the unique type. 
The similarly colored T. mellea Smith has toothed mandibles. 
Anthophora pilifrons Packard 
g. A species of ordinary size, the face with dense white hair, the vertex with much 
black, the thorax above with black and pale fulvous mixed, but on hind part of scutellum 
dense and entirely rather bright fulvous. First recurrent nervure reaching second sub- 
marginal cell in middle. Legs dark red; outer side of hind tibia and basitarsus with 
much coarse black hair. Abdomen with dense pale fulvous hair-bands. Apical plate 
very narrow. 
Centris conica (Packard) 
Anthophora conica Packard, Rept. Peabody Acad., 1869, p. 57. 
9. This is a genuine Centris, of the subgenus Trachina. The face-marks are of the 
same type as those of C. flavifrons (Fabr.), but the lateral marks are narrower and longer, 
and the transverse bar on the clypeus is more elevated in the middle, forming, with the 
upright mark, a sort of reversed Y. Labrum cream-color; eyes large, prominent, green; 
thorax above with dense rufo-fulvous hair, pleura with paler hair; legs red, the large 
scopa of hind legs orange-fulvous; abdomen red; the second and third segments with 
the posterior middle, narrowing laterally, darker and a little metallic; segments 4 and 5 
with orange-fulvous hair, and their tegument pale, except that 4 is dark in basal middle. 
Centris quadrimaculata Packard 
@. Nearly 25 mm. long; face with four subtriangular cream-colored marks, two of 
them on the clypeus; middle of clypeus impunctate; upper part of cheeks very shiny; 
hair of thorax above chocolate-color, dense, moss-like; scopa of hind legs fulvous; wings 
deep ferruginous; abdomen clear red, without bands. 
Friese suggests that this may be the female of C. personata Smith, but it is too large. 
Centris braccata Packard 
g. A large black species, about 30 mm. long; no light marks on face; basal half 
of first abdominal segment ferruginous; mandibles with a yellow subapical band; clypeus 
deep ferruginous, with a smooth median band, which is faintly keeled in the middle; 
posterior orbital margins very narrowly ferruginous; hair of thorax above dense, brown- 
black; wings very dark violaceous; abdomen without bands; scopa of hind legs brown- 
black. Close to C. atra Friese, but larger. 
Eulzema bombiformis (Packard) 
Euglossa bombiformis Packard, Rept. Peabody Acad., 1869, p. 57- 
Very large and robust, about 30 mm. long; mouth parts very large; head and thorax 
black, with short dark chocolate-colored hair; eyes green; clypeus with a strong median 
longitudinal keel; a ridge across front as in E. dimidiata; scutellum as in dimidiata; 
wings with basal part fuscous, beyond that pale reddish, the apical margin broadly hya- 
