FUNGUS GNATS OF NORTH AMERICA. 165 



12. Genus Mycomya Rondani. 

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

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

 Sciophila, 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. Neoempheria 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- 

 tennee ; 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; antennae 

 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 cihated on 

 liexor 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 

 where 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 usually rather 

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

 wood. 



Tabic 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. litforalis, var. frequens. n. var. 



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. 



