FUNGUS GNATS OF NORTH AMERICA. I/I 



of the first and sixth in large part, and narrow posterior mar- 

 gins of the remaining segments dark brown, usually also a 

 brown spot on the anterior margin which is more or less pro- 

 longed along the median line; abdominal hairs pale. Hypopy- 

 gium (similar to fig. 144) yellow, much resembling that of 

 M. pcnicillata Dzied. ; the inferior forceps with broad margin 

 and strongly ciliate; the superior forceps (fig. 145) widened 

 spatulate, the margin with one long and slender seta and sev- 

 eral shorter, stout, blunt spines, and arising from near the base 

 a curved spatulate and setose process projecting laterally; the 

 intermediate appendages are much prolonged, slender, doubly 

 curved ; the caudal margin of the ventral sclerite is bilobed and 

 pectinate. The legs are yellow and quite slender, the fore meta- 

 tarsus is over ^ as long as the tibia ; the larger setae of hind 

 tibiae but little longer than the diameter of this member. Wings 

 (fig. loi) hyaline, slightly yellow tinged; subcosta ends in R^ 

 usually proximad though sometimes distad of the middle of 

 cell R^ ; variable occasionally even in the two wings of the same 

 individual, small cell about twice as long as broad measured 

 along Rj ; petiole of the media longer than M, ; R4+5 ends very 

 slightly before the tip of the wing; cubitus forks distad of the 

 R-M crossvein. Length of wing is 3 mm. and is 3 times as 

 long as the fore metatarsus. Halteres yellow. Ithaca and Old 

 F'orge, N. Y. ; Price Co., Wisconsin ; July and August. 



Female. Similar to the male but the wing is slightly larger 

 and the ratio of fore metatarsus to tibia is smaller. In imma- 

 ture specimens the stripes on mesonotum may be pale brown, 

 or the lateral stripe yellowish brown and the median stripe 

 darker. 



Var. frcqucns n. var. 



Male and female. Similar to the typical form in structure 

 of wing and legs but differs in having head including mouth 

 parts, thorax (except humeral spot and a spot at base of the 

 wings), and abdomen dark brown; coxae yellowish brown; legs 

 tinged with brown; and inner lobe of superior forceps crescent 

 shape (fig. 144a, edge view). 



Berkeley (Wheeler) ; Alum Rock Park, San Jose: (Aldrich) : 

 Felton, St. Cruz ]\Its. (J. C. Bradley) ; California, March, April, 

 May. 



