FUNGUS GNATS OF NORTH AMERICA. 309 



low hairs. Mesonotum with 3 wide blackish vittse; the laterals 

 abbreviated anteriorly, the middle one wedge shaped ; hairs 

 yellow ; lateral and scutellar setae strong, black ; pleura yellow 

 or brownish yellow, metanotum brown. Abdomen with black- 

 ish hair; first segment brown with yellow posterior margin, 

 segments, 2, 3, 4 yellow, 5 and 6 brown; hypopygium brown, 

 small. Coxse, femora and tibiae yellow, the apices of the hind 

 femora, and of hind tibiae and of all the tarsi brown ; setae of 

 coxae and tibiae black. Each wing with a spot on the disk and 

 another at the apex of Rs. Halteres yellow. 



Female. Described by Lundstrom ('07 and '09 j. Abdomen 

 wholly yellow except the first and sometimes a part of the 

 sixth is brown. 



Var. divergens n. var. 

 Male. Differs from Winnertz's description as follows : 

 Front between middle ocellus and the base of the antennae yel- 

 low; tips of trochanters, of middle femora and of middle tibiae 

 black; abdomen with a narrow black median dorsal stripe, 6 or 

 8 subconfluent black spots on sides of segments 2, 3, 4, and the 

 greater part of sides of 5 and 6 except narrow posterior mar- 

 gin, black. Wing spots somewhat larger than in the European 

 form. Hypopygium and wing as figured (Figs. 120, 229). The 

 spurs are about 3-4 as long as the corresponding metatarsi; the 

 hind femur is about 1-4 as wide as long; the hind tibia about 

 1-8 as wide as long. A single specimen was bred from a fun- 

 gus (Collybia sp. ?), Nov. 2, Orono, Me.; male and female 

 specimens from St. Johnsbury, Vt., and Hanover, N. H., 

 ( C.W.J. ), June, July. 



22. Rhymosia Winnertz. "^ ^ 

 Verb. Zool.-bot. Ges. Wien. XHI. 810. 1863. 

 Head oval, front broad, ocelli 3, laterals large, closely con- 

 tiguous to the eye margin, the middle one minute, placed in a 

 groove on the front, sometimes almost concealed. Legs long 

 and slender; lateral setae of tibiae delicate and little if any longer 

 than the diameter of the tibiae at the widest part. Posterior 

 basal set£c of hind coxae present. Costa meets the radial sector 

 before the tip of the wing; subcosta very short, ending free or 

 in Ri ; fork of media proximad or under base of Rs ; cubitus 



