P'UNGX^S GNATS 01? NORTH AMERICA. 99 



Thorax ochraceous, shining, mesonotum with 3 confluent 

 stripes, hairs yehow, blackish on the dark stripes, setse black; 

 pleura in part fuscous. First abdominal segment wholly 

 fuscous black, the remaining segments fuscous black each 

 margined anteriorly and posteriorly with yellow, venter yel- 

 lowish tinged. Coxse and legs yellowish, hind femora with 

 black tips; middle tibise each with 3 setge on flexor surface, 

 fore tarsi moderately thickened, hind metatarsus about as long 

 as the 3 following joints taken together. Wing with central 

 spot and a preapical fascia which fills the apex of cell of R' 

 and extends into cell Rs beyond this are 2 small very indis- 

 tinct clouds, one on each branch of the media. "English 

 River;" "Maine;" Wis. (W.M.W.) July. 



25. Mycefophila foecunda n. sp. 

 Male and female. Length 3 mm. Head, thorax and abdo- 

 men shining fuscous black, the scape, palpi, humeri and lateral 

 posterior margins of mesonotum narrowly, small spot on apex 

 of scutellum and very narrow hind margin of intermediate 

 abdominal segment, yellow ; hypopygium long, with acute for- 

 ceps (Fig. 81). Coxse and legs yellow, bases of hind cox^e, 

 a spot under middle and hind femora, the tips of the middle 

 femora, the apical 1-4 of each hind femur, dark brown, tarsi 

 brownish; fore metatarsus less than 7-8 of tibia; middle tibia-. 

 each with 3 or 4 setae on flexor surface, hind metatarsus nearly 

 .8 as long as the 4 remaining joints taken together, fore tarsi 

 of female swollen below. Wing h3^aline, with a central spot, a 

 faint cloud behind the fork of the cubitus, and a preapical 

 fascia which fills the apex of cell Ri and extends to Cm though 

 broken and very faint beyond Mi (Fig. 200). Halteres yellow. 

 In some specimens the coxae and under side of the femora are 

 not marked and the preapical wing cloud obsolete beyond M:. 

 Juliaette, Id., (J.M.A.) ; Orono, Me., Ithaca, N. Y. ! (Nov.). 

 Reared irom Polyfbrus sp. 



26. Mycetophila imitator n. sp. 

 Male and female. Length 3 mm. Similar to M. foecunda 

 but differs in being subopaque, in lacking the abdominal fasciae 

 and in the structure of the hypopygium. Head, thorax, and 

 abdomen black, subopaque, palpi, scape and small humeral 

 spot yellowish; hypopygium short (Fig. 91). Coxae and legs 



