FUNGUS GNATS OF NORTH AMERICA. 183 



lower margin of pleura brownish ; setae black, fine hairs pale : 

 4 scutellar setae black. Abdomen yellow, tergites black, except- 

 ing- the wide posterior margins: hairs pale. Hypopygium (fig. 

 141) yellow with a black margin, resembling that of M. ornata 

 Meig., superior forceps Cfig. 1425) folded down in the figure, 

 hidden by the large lobular intermediate appendages ; the ventral 

 sclerite with short lateral setose lobes T inferior forceps?) and 

 having two strong mesad projecting spines : mesad of these is 

 a pair of pectinate processes each with five or six teeth. Legs 

 yellow, fore metatarsus about a twelfth shorter than the tibiae; 

 setae of hind tibiae about as long as the diameter of the member. 

 Wings hyaline, yellowish tinged, larger veins yellowish brown : 

 subcosta ends in the costa before the distal end of the cell R, 

 which is twice as long as wide : subcostal crossvein near the 

 middle of this cell; R^^ ends at the apex of the wing; petiole 

 of media is ^ as long as ^M, ; cubitus forks under the R-!M 

 crossvein; anal' vein strong; wing 5.5 mm. long, which is 2.5 

 times as long as the fore metatarsus. Halteres yellow. 



Female. A female taken in cop. with the above difiFers in 

 being paler (perhaps immature), having only traces of thoracic 

 stripes ; abdominal markings pale brown, confined to the basal 

 half of the segments ; wing twice as long as the fore metatarsus. 

 One pair taken by Professor Aldrich at Juliaetta, Id. Also one 

 specimen from Muir Woods. ^larin Co., California, and another 

 from Selkirk Mts., B. C, taken by Mr. J. C Bradley. 



\'ar. a. A female specimen from Moscow, Id., collected in 

 June by Professor Aldrich and another collected in ^luir Woods, 

 Cahfornia. by ^Ir. J. C. Bradley, differ in being rather darker, 

 in having the cubitus fork distad of the R^-^M crossvein and the 

 subcostal crossvein placed near the basal fourth of the cell R^. 



\'ar. b. A female specimen taken in the Sierra ^lorena !Mts.. 

 California, by Mr. J. C. Bradley in April differs in having the 

 fore metatarsus' .8 as long as the tibia, the fork of the cubitus 

 proximad of the R-]\I crossvein and the subcostal crossvein 

 distad of the middle of the cell R-. It is bareh* possible that 

 this is the female of M. calcarata Coq. 



21. Mycomya nugatoria n. sp. 

 uugatoria JVheeler. MS. iSciophila). 

 Female. Length 3 mm. Face and 2 or 3 basal joints of the 

 robust antennae pale yellow : palpi and apical joints of antennae 



