No. 466.] GENUS DJ AD ASIA. 743 



Apex of abdomen bidentate . ...'. . . . 2. 



2. Abdomen above with much black hair on discs of segments beyond the 



second . . . . . . . . . -g ^_ 3. 



Abdomen above without black hair . . " . . . . 6. 



3. Large; at least 13 mm. long; apical teeth of abdomen large and 

 divergent ....... bituberculata (Cresson). 



Smaller; about 10 mm. long; apical teeth of abdomen small and close 

 together . . .''-. . . . . . . 4. 



4. Hind tibiae thickened, but shape not remarkable ; basal joint of hind 

 tarsi dark ferruginous, long, slender, and curved, its apex not produced, 

 the hair on its inner side orange ; maxillary palpi not fringed with hair, 

 except a little tuft at the end of second joint ; tegulae light rufous 



sumichrasti (Cresson). 



Hind tibiae greatly swollen, narrowing to a very slender base, shaped 

 something like a wine-bottle ; basal joint of hind tarsi dark, not so long, 

 with black or dark fuscous hair on inner side . . . . 5. 



5. Tegulae dark but decided red ; second submarginal cell much narrowed 

 above; hair of mesothorax white . . . . afflicta (Cresson). 

 Tegulae piceous : second submarginal cell scarcely narrowed above ; hair 

 of mesothorax and scutellum gray . . afflicta perafflicta Cockerell. 



6. Basal joint of hind tarsus ending in a long process ; species covered 

 with gray hair ; maxillary palpi with no fringe of long hairs, but second 

 joint ciliate ........... 7. 



Basal joint of hind tarsus not ending in a long process . . 8. 



7. Larger forms ....... australis (Cresson). 



Smaller, down to about 10 mm. long . australis rinconis (Cockerell). 



8. Very large, about 16 mm. long . . . megamorpha Cockerell. 

 Rather large, length over 10 mm., the pubescence more or less ochrace- 

 ous on thorax, sometimes quite fulvous ; facial quadrangle longer than 

 broad ............ 9. 



Small, length less than 10 mm. ....... 10. 



9. Hair of thorax more or less fulvous . . . enavata (Cresson). 

 Hair of thorax paler .... enavata var. densa (Cresson). 



10. Abdomen above shining and sparsely hairy, not banded ; face broad, 

 orbits little converging below (distinctly less than in diminuta) 



nitidifrons Cockerell . 

 Abdomen hairy, the hind margins of the segments banded 



diminuta (Cresson). 

 Abdomen covered with appressed white tomentum 



sphceralcearum Cockerell. 



D. albovestita Provancher, I have not seen. It was described 

 from the female; length just over 8 mm., flagellum reddish 

 beneath, tegulae brownish, margins of abdominal segments pale 

 yellow and covered with dense whitish pubescence ; apex red- 



