FUNGUS GNATS OF NORTH AMERICA. I7I 



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. peniciUata 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 setas 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+3 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 

 Forge, 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. 



1/ 



\ ar. frequcns n. var. 



Male and female. Similar to the typical form in structure 

 of wing and legs but diflfers 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 Mts. (J. C. Bradley) ; California. March, April. 

 May. 



