340 T. D. A. COCKERELL. 



2. Scopa yellow or yellowish, without black, even at apex; hair of abdomen 



orange -3. 



Scopa with some black at apex 4. 



3. Last dorsal segment descending; anterior edge of clypeus tuberculate ; hind 



tarsi ordinary ; claws with no distinct basal tooth. 



bipartita Sm. (T.). 

 Last dorsal segment not descending; hind tarsi broad and flattened. 



Candida Sm. (T.). 



4. Abdomen without hair-bands ; size smaller; scopa yellowish white, black on 



last segment; a conspicuous band of black hair along hind margin of 

 scutellum, contrasting with a pure white tuft on each side of rneta- 



thorax irritans Sm. (T.). 



Abdomen very broad, with well-developed hair-bands 5. 



5. Scopa white, black at the sides and on apical segment ; tegulse red ; a large 



tuft of hair, dark brown above and white beneath, on each side be- 

 hind the wings breviuscula Sm. (T.). 



Scopa yellowish, black on last two segments (but some yellow basally on the 

 last) ; tegulse black ; claws with a well-developed inner tooth. 



\ alida Sm. (T.). 



6. Legs red ; abdominal hair-bands orange ; tegulse red ; hair about base of wings 



orange-fulvous; claws with no basal tooth azteca Cress. 9 • 



Legs at least largely black ; males 7. 



7. Larger; middle femora greatly swollen; anterior tarsi with a boat-shaped 



scale; anterior coxae with large spines, but no bristles above them; 

 flagellum (except basally) strongly crenulate beneath ; claws cleft but 



with no distinct basal tooth artuata Sm. (T.). 



Smaller; tarsi light yellow; hind tarsi strongly curved; middle tibiae red 

 (blackened within), with a curious tubercle near apex on inner side; 

 anterior tarsi flattened, canary yellow, the long hairs of the fringe 

 black Candida Sm. (T.). 



Megachile armata is a Xanthosarus, very close to M. latimanus, 

 but has a good deal of black hair near apex of abdomen above, and 

 the hollow scale of anterior tarsus is fringed with black on inner 

 side, and for basal half on outer. 



Table C. — Neotropical species. 



Tegument of abdomen entirely red 1. 



Tegument of abdomen not red, or not entirely red 2. 



1. Scopa white, black on apical segments (Santarem). 



rubrivenlris Sm. 9 (T.). 

 Scopa pale yellowish, becoming fulvous on apical segments (S. Paulo). 



pulclira Sm. (T.). 



2. Scopa very bright red ; abdomen black, without bands (S. Domingo). 



sedula Sm. 9 (T.). 

 Scopa not so colored ; or males 3. 



3. Wings orange, with broad blackish outer margins 4. 



Wings not so colored 5. 



