FUNGUS GNATS 01' NORTH AMERICA. 6/ 



jj. Postero-ventral angles each with several 

 setae; the broader forceps with bkint apex 

 and a tuft of setse on the preapical angle 

 (Fig. 52). 21. cap i I lata n. sp. 



gg. Postero-ventral angles of hypopygial sclerite with- 

 out several conspicuously strong setse or spines, 

 h. One pair of the hypopygial appendages curved on 

 apical third and conspicuously longer than the 

 others. (Fig. 53) ; dark brown species. 



22. obediens n. sp. 

 hh. Two pairs of appendages subequal in length. 



i. Appendages unusually slender; one pair blunt, 

 each limb of the other pair with a long sub- 

 basal branch (Fig. 54b); thorax brown: 

 abdomen with yellow. 23. attrita n. sp. 



ii. Appendages otherwise. 



j. The more slender forceps with several apical 

 setse (Fig. 55) ; pleura in part yellow. 



24. repanda n. sp. 

 jj. Slender forceps without apical setse. 



k. Abdomen with yellow markings at base of 

 venter; hypopygium (Fig. 56). 



25. absurda n. sp. 

 kk. Abdomen brown ; hypopygium (Fig. 57). 



26. casta n. sp. 

 E. analis Coq. belongs to Mycothera. 



General description of Species of Exeehia. 



The species described below, unless specifically stated to the contrary, 

 possess the following characters in common : 



Head and antennas fuscous, the scape and base of the first flagellar 

 joint and the palpi yellow. Dorsum of the thorax fuscous apparently 

 consisting of 3 confluent stripes, leaving the humeri yellow; scutellum 

 and metanotum fuscous ; hairs pale, setse blackish ; scutellum with 2 

 black setae. Dorsum of abdomen fuscous, hypopygium yellow. Coxse 

 and legs yellow, the tibiae dusky yellow, spurs and tarsi infuscated. 

 Subcosta short, ends free ; venation as figured. Halteres yellow. 



Although the ovipositor of the female offers good specific characters, 

 descriptions are only given of those females which are definitely asso 

 ciated with males. 



T. Exeehia perspicna n. sp. 

 ]\[ale. Length 3.25 mm. Pleura brown. Abdomen brown, 

 the posterior segments darker brown ; appendages of the hy- 

 popygium (Fig. 31) slender; terminal ventral sternites, paired, 

 rectangular. Fore metatarsus over 1.15 the tibia in length. 

 Wing dusky hyaline (Fig. 15Q). Sage Creek. Wyo.. 

 (W.^I.W.) Sept.'; Orono, Me.! Oct. 



