56 E, T. CKESSON. 



MALES. 



Eyes ovate, eniarginate. subopaque ; tegulae large, elongate oval 2. 



Eyes round or oval, smooth, polished, not eniarginate ; tegiilie rounded, not 

 elongate 15. 



2. First segment of abdomen broad, scarcely constricted at apex, gradually di- 



lated posteriorly and sessile with base of second segment ; j)roth()rax 



rounded anteriorly ; abdomen more or less red 3. 



First segment narrower, depressed, and of uniform width, being quadrate or 

 elongate, with parallel sides; prothorax rectangular in front 6. 



3. Pubescence of second and following segments of abdomen at apex black, more 



conspicuous from a lateral view; base of clypeus with a more or less 

 prominent nasutiform projection, seen more distinctly from beneath. 



1. niacapa Cress 

 Pubescence of segments 1-5 or 6 at apex golden or fulvous 4. 



4. Pubescence on tegulse black ; first segment of abdomen except tip, and apical 



segment, black ; clypeus with obtuse nasutiform projection at base ; 



form robust 2. escada Cress. 



Pubescence of tegulae pale 5. 



5. Base of clypeus with a semicircular roof-like i)rojection ; apical segment of 



abdomen sometimes black or fuscous 4. riifiveiitriN Klug. 



Base of clypeus with a spiniform jirojection at base; two apical segments of 

 abdomen black ; form slender 3. manga Cress. 



6. Tegulse with a central longitudinal carina 7. 



Tegulaj without a longitudinal carina 8. 



7. Abdomen black, second segment above silvery at apex 5. gracilis Sni. 



Abdomen with segments 2 and 3 red 6. iagiiiia Cress. 



8. Abdomen black or purple, marked with silvery pui)escence 9. 



Abdomen black, apical half of second, and the following segments with dense 



golden pubescence; metathorax and first segment of abdomen silvery.* 



13. oiica Cress. 



Abdomen ferruginous, segments 4-7 black ; apex of segments 2 and 3 yellow- 

 ish ; head, prothorax, pleura and metathorax densely silvery-ochra- 

 ceous 14. vicosa Cress. 



Abdomen entirely fulvous, clothed with golden pubescence 14. 



9. First segment of abdomen short, scarcely longer than broad 10. 



First .segment elongate, twice longer than broad 13. 



10. Last ventral segment more or less pale testaceous 11. 



Last ventral segment entirely black 10. jatoba Cress. 



11. Base of second segment of abdomen much flattened, and covered like first 



segment with short silvery white pubescence ; the metathorax with a 



prominent obtuse tooth on each side- . • -7. arg*'iituia Dalla Torra. 



Base of second segment more or less depressed, but not covered with pale 



pubescence 12. 



12. Scutellum produced at apex and bilobed ; metathorax with a prominent ob- 



tuse tooth on each side, and without a subapical discal tooth. 



8. inora«la Cress. 

 Scutellum not produced at apex, simply convex ; metathorax with lateral 

 margin serrate and a more or less distinct subapical discal tooth. 

 ' 9. croata Cress. 



