184 UNIVERSITY OF COLORADO STUDIES 



Maxillary palpi 6-jointed. 



Blade of maxilla broad at base, suddenly narrowing 

 to the slender apical portion. 



Clypeus dark in male. Diadasia Patt. (S.) 

 Clypeus light in male. Dasiapis Ckll. (S.) 

 (Vachal includes both Diadasia and Dasia- 

 pis in Ancyloscelis, a South American genus.) 

 Blade of maxilla broad, gradually narrowing to the 

 more or less blunt tip. 



First recurrent nervure joining second sub- 

 marginal cell near middle. 



Mandibles simple or bidentate. 



Anthophora Latr. 1 (P.) 

 Mandibles tridentate. 



Clisodon Patt. (P. D.) 

 First recurrent nervure joining second sub- 

 marginal cell at or very near end. 



Emphoropsis Ashm. (P. D.) 



c Paraglossae very long, hairy. Etjcerinae. 



Maxillary palpi 6-jointed. Tetralonia Spin. (P.) 



Maxillary palpi 5-jointed. 



Maxillary palpi comparatively long and slender; bees 

 usually found on Cucubitaceae. 



Xenoglossa Smith (S.) 

 Maxillary palpi shorter, fifth joint reduced. 



Xenoglossodes Ashm. (S. D.) 

 Maxillary palpi 4-jointed. Melissodes Latr. (S.) 



{Xenoglossodes is nearer to Melissodes than to Xeno- 

 glossa. Martinella is a genus found in New Mexico, 

 closely allied to Melissodes. The only known species 

 has the flagellum bright yellow in the male.) 



C. Tongue long, filiform ; two submarginal cells ; labial palpi with the basal joints much 

 elongated, the apical minute ; under side of female abdomen with a pollen-collecting 

 scopa, except in the parasitic genera. MEGACHILIFORMES: MEGACHILIDAE 



1 Eyes hairy; 2 parasitic group related to the Megachilinae. Coelioxynae. 



Coelioxys Latr. (P.) 



2 Eyes not hairy. 



a Non-metallic, 2 pollen-collecting bees, without colored markings. 

 Megachilinae. 



aa Bees of large or medium size. 



Marginal cell sharply pointed; face in female with 

 a protuberance; male with a pulvillus. 2 



Lithurgus Berthold (P.) 

 (One species in our fauna.) 

 Marginal cell obtuse; face without a protuberance; 

 no pulvillus in either sex; maxillary palpi 

 3-jointed. 

 Megachile Latr. (Many species) (part P., part N.) 

 bb Small bees, with a pulvillus. Osmiinae. 

 Maxillary palpi 3-jointed. 



Base of first abdominal segment with a 



1 Anlhophoroides T. & W. Ckll., from New Mexico, is like Anthrophora, but with five- jointed maxillary 

 palpi. The only species is A. vallorum Ckll. 



» Exceptions to these characters are found in certain Old-World species. 



