ART. 12 MEGACHILID BEES FROM BOLIVIA COCKEKELL 13 



2. Small species with strongly orange-tinted wings microscma Cockerell. 



Much larger; wings not orange 3. 



3. Pleura with black hair hypccrita Smith. 



Pleura with light hair virescens Cockerell. 



4. Tegulae black tergina Vachal. 



Tegulae clear red 5. 



5. Clypeus convex, ordinary 6. 



Clypeus more or less flattened or concave in middle, with a more or less dis- 

 tinct ridge on each side of median area 7. 



6. Larger; middle tarsi broad, with clear red hair on outer side; m.iddle tibiae 



ending in a very broad subtruncate red lobe mariannae Dalla Torre. 



Smaller; middle tarsi slender; middle tibiae with the apical red lobe emargi- 

 nate or bidentate ivonensi s, new species. 



7. Larger; wings strongh^ orange; closely resembles M. mariannae except as to 



clypeus scapularis Vachal. 



Smaller; wings not orange 8. 



8. Supraclypeal area well punctured; eyes red constructrix Smith. 



Supraclypeal area polished, smooth; eyes not red lenticula Vachal. 



Males 



Legs red 1. 



Legs not red, or only in small part red 2. 



1. Anterior tarsi modified polyodonta, new species. 



Anterior tarsi simple anodonta, new species. 



2. Anterior tarsi modified 3. 



Anterior tarsi simple 4. 



3. Larger; anterior basitarsus with a long projecting lobe crassipes Smith. 



Smaller; anterior basitarsus without a projecting lobe fumicosta Strand. 



4. Hind femora clear light red behind; sixth abdominal segment not cmarginate 



or toothed lenticula Vachal. 



Hind femora dark red or black behind 5. 



5. Sixth abdominal segment emarginate, the margins red; wings suffused with 



orange ivonensis, new species. 



Sixth abdominal segment otherwise 6. 



6. Si.xth segment irregularly multidentate brasiliensis Dalla Torre. 



Sixth segment otherwise 7. 



7. Smaller; sixth segment dentate or emarginate 8. 



Larger; sixth segment entire or (/ncosa) shallowly emarginate 11. 



8. Sixth segment with two widely separated sharp teeth 9. 



Sixth segment emarginate 10. 



9. More robust; tegulae red microsoma Cockerell. 



Less robust; tegulae black microdontura, new species. 



10. Face covered with bright yellow hair beniensis, new species. 



Face without yellow hair leucostomella, new species. 



11. Face covered with yellow or yellowish hair; tegulae light ferruginous 12. 



Face without yellow hair, or else tegulae dark 13. 



12. Mesothorax dull and closely punctured all over lenticula Vachal. 



Mesothorax shining and more sparsely punctured on disk 



sejuncta, new species. 



13. Face with orange hair; thorax above without black hair 



tricosa, new species. 

 Face with hair not orange; thorax above with a good deal of black hair 



semota, new species. 



