I 



I^UNGUS GNATS OF NORTH AMERICA. 85 



cc. Wing with preapical cloud or fascia in addition to the central 

 spot, 

 d. Scutellum black, humeri yellow ; females. 



e. Preapical wing cloud does not reach vein Mi. 4 M. sp. 

 ee. Preapical wing cloud crosses M=. 5. M. sp. 



dd. Robust species with scutellum largely yellow. 



e. Cubital cell broad, branches of Cu slightly divergent. 



6. procera. 

 ee. Cubital cell • moderate (Fig. 196), branches of Cu sub- 

 parallel apically. 

 f. Wing with about 4 spots ; one on each of M and Cu ; 

 hypopygium (Fig. 71). 7. fastosa n. sp. 



ff. No distinct spots on media and cubitus ; female. 



8. M. sp. 

 aa. Two ranges of sette on extensor surface of each hind tibia, 

 b. With no setas on flexor surface of middle tibije. 



c. Wing immaculate; last joint of palpus spatulate; hypopygium 

 (Fig. 72). 9. punctata. 



cc. With wing spots. 



d. With but a central wing spot. 



e. Thorax dark brown, with not more than 4 fine setae near 

 apex of hind tibia on inner lateral side ; hypopygium 

 (Fig. 72). 10. falcata n. sp. 



ee. Reddish brown or yellow thorax ; S or more fine setae 

 on inner lateral side of hind tibia apically. 

 f. Thorax yellow ; apically half of inner lateral side of 

 hind tibia ciliate; hypopygium (Fig. 74). 11. mutica. 

 if. Thorax reddish brown, brown dorsum and pleura ; 

 hypopygium (Fig. 75). iia mutica van a. 



dd. With 2 wing spots ; branches of the cubitus slightly diverg- 

 ent; hypopygium (Fig. 76). 12. lenis n. sp. 

 bb. With one or more setae on flexor surface of middle tibia, 

 c. With but 'one seta on flexor surface of middle tibia. 



d. Wing without distinct spot. 17. dolosa. 



dd. Wing with one or more spots. 



e. Wing with discal spot and a preapical cloud which does 

 not pass the media. 13. monochaeta. 



ee. The apex of the wing more or less clouded, or other spots 

 present, 

 f. Apex_,of wing brown, an oval hyaline spot below Rs. 



Mycothera fenestrata. 

 ff. Apex not distinctly clouded, a spot on cell M2 dis- 

 tinctly separated from the preapical spot. 



15. quatuornotafa. 

 cc. With 2 or more setae on flexor surface of middle tibia. 

 d. Wing without distinct spots. 



e. With a distinct thickening of the apical half of the basal 

 section of the media ; fore metatarsus longer than its 

 tibia. St. Vincent Isl. 16. nodulosa. 



