FUNGUS GNATS OF NORTH AMERICA. 165 



12. Genus My corny a Rondani. jz, 



Mycomya, Rondani. Dipt. Ital. Prodr. I. 194. 1856. ""* 

 Sciophila, Meigen (part.) Syst. Beschr. I. 245. 30. 1818. 

 ^ciophila. Winnertz. Verb. Zool.-bot. Ges. Wien. XIII. 707. 

 1863. 



The name Mycomya is used here in the sense of Sciophila of 

 Winnertz over which it has priority. Necemphcria which I con- 

 sidered as a subgenus in the "Genera Insectorum" I here restore 

 to its original position for reasons already mentioned. 



Head small, flattened in front, placed low upon the thorax ; 

 eyes elongate oval, usually emarginate at the base of the an- 

 tennae ; ocelli placed close together, the laterals large, the median 

 very minute or wholly wanting ; proboscis short, palpi incurved, 

 4 jointed, the first joint very small, the fourth longest ; antennse 

 2-)- 14 jointed, the joints of the scape setose at the tip. flagellar 

 joints cylindrical, pubescent. Thorax highly arched, ovate, scu- 

 tellum small, semicircular in outline. Abdomen slender, with 

 7 visible segments, constricted at the base ; somewhat clavate, 

 particularly in the male; hypopygium rather small (figs. 132- 

 147) ; ovipositor short, terminating in 2 small lamellae (fig. 139). 

 Coxae long, setose ; legs long and slender, femora ciliated on 

 flexor surface; tibiae with lateral setae. Wing (figs. 101-106) 

 microscopically setulose, somewhat projecting beyond the tip 

 of the abdomen. The costa usually ends at the tip of the wing 

 W'here it meets R^^., but usually not produced beyond it ; the 

 subcosta may end in the costa, in R^ or end free ; the subcostal 

 crossvein at or distad of the base of cell R^ ; cubitus forks prox- 

 imad of the media ; the anal veins incomplete and visually rather 

 short. The larvae have been found in fungi and in decaying 

 wood. 



Table of Species. 

 Males, 

 a. Thorax and abdomen nearly wholly dark ; western species, 

 b. Subcosta ends in R, ; cubitus forks distad of the R-M 

 crossvein. i. littoralis, yav. frequens. n. yslt.^ 



bb. Subcosta ends in the costa; cubitus forks proximad of 

 the R-M crossvein. 

 c. Middle coxae with spurs ; petiole of media about half 

 as long as M^. 4. calcarata. 



cc. Middle coxae without spurs ; petiole of media about 

 six times as long as R-M crossvein. 5. simplex. 



