I06 MAINE AGRICULTURAL EXPERIMENT STATION. I912. 



black. Thorax fuscous black, subopaque, humeri, posterior 

 angles, spot in front of scutellum, and the scutellum except the 

 sides, luteous ; hairs yellow, setae black. Abdomen fuscous 

 black, the lateral and posterior margins of each segment except 

 the first yellowish ; the small hypopygium yellow. Cox^e and 

 legs pale yellow, tips of hind femora black; middle tibiae each 

 with 2 setae on flexor surface, hind metatarsus about equal to 

 the following 4 joints taken together; tarsi more or less dusky. 

 Wing with rather large central spot and a preapical fascia 

 which extends from the tip of the cell Ri obliquely proximad 

 into cell Rs but not reaching vein Mi; below this fascia the 

 veins Mi and Ms are clouded with gray. "D. C." There are 2 

 ranges of setae on the extensor surface of each hind tibiae in 

 the type specimen. 



Var. a. Male. Thorax subshining dark brown, scutellum 

 wholly brown, fore tarsi slightly swollen, otherwise as above ; 

 hypopygium (Fig. 94). Ithaca, N. Y., July, August. 



43. Mycetophila socia n. sp. 

 ]\'Iale and female. Length 3 mm. Thorax and abdomen sub- 

 shining brownish black, humeri, posterior angles of mesonotum 

 and narrow hind margins of the segments of the abdomen yel- 

 low ; hypopygium (Fig. 95). Fore metatarsus about 7-8 as 

 long as the tibia; fore tarsi not swollen. Wing with brown 

 central spot and an oval grayish preapical spot (Fig. 212). 

 Otherwise as in M. trichonota. Ithaca, N. Y., August. 



44. Mycetophila discoidea Say. 

 Journal Ac. Sc; Phil. VI. 153, 1829. 

 Thorax pale with a blackish disk, wings with a fuscous spot. Head 

 blackish, antennae whitish, at tip blackish ; thorax pale honey-yellow, 

 disk blackish owing to 3 vittje of that color being confluent into one , 

 wings hyaline, with a fuscous spot on the connecting nervures ; tergum 

 blackish, somewhat sericeous ; poisers whitish ; feet whitish, with 

 blackish tarsi ; abdomen whitish at base. Length more than i-io inch. 

 Belongs to Meigen's first division of the genus. Indiana. 



45. Mycetophila ichneumonea Say. 



Journal Ac. Sc. Phil. III. 16. 1823. 

 Female. Length 3 mm. Clay yellow, abdomen brown dorsally. Be- 

 longs to Meigen's first division. Antennje paler, head more dusky clay 

 3^ellow. Mesonotum moi-e dusky, pleura paler clay yellow. Segments 



