MAY FLIES AND MIDGES OP NEW YORK 303 



posteriorly or less distinct, the lateral ones anteriorly abbre- 

 viated; the pleura yelloAV, the sternum brown, the scutellum 

 yellow, the metathorax more or less dilutely brown. Abdomen 

 yellow with yellow pile. Antennae dilutely brown or ^^ellow ; the 

 palpi yellow. Legs and halteres yellow. Wings Avhitish h3^aline, 

 moderately hairy, the anal lobe not produced, widely rounded, the 

 veins thin and pale, toward the costa a little stronger, R^-i... 

 straight, its apex nearly over the tip of Cu^ ; the costa is produced 

 a little beyond the tip of the radius, the media runs into the tip, 

 the posterior branch of the cubitus is suddenly deflected. The 

 middle and hind legs are hairy; the fore metatarsus is a little 

 shorter than its tibia. 



Female. Shorter than the male, its thorax a little paler, the 

 wings a little more hairj ; in other respects like the male. Length 

 1.5 to 2 mm. Southern Greenland. Lundbeck, loc. cit. 



Var. a. (P1.31, fig.3.) Some Ithaca specimens agree very well 

 w^ith the above description, but the palpi are pale fuscous instead 

 of yellow, and the sternum is dusky yellow instead of brown. 

 The fore tarsi are slightly infuscated and the posterior branch of 

 the cubitus is suddenl}^ deflected near the end similar to but in less 

 degree than in C a m p t o c 1 a d i u s ; in the latter respect it 

 differs particularly from my specimens of M . nanus Meigen. 

 The fore metatarsus is about three fourths as long as its tibia. 



Var. 1). A specimen from Chicago is wholly yellow; the mouth 

 parts, antennae, tliree thoracic stripes, a spot on the pleura, the 

 metanotum and sternum, brown. The legs, excepting the coxae 

 and trochanters, somewhat infuscated. Wings hyaline, hairy, 

 anterior veins slightly yelloAv. Halteres yellow. Length 2.5 mm. 



6. Metriocnemus exagitans n. sp. 



(P1.31, fig.4) 



Male. Head yelloAvish, palpi and antennae fuscous, proboscis 

 yellowish; dorsum of thorax with three subshining blackish 

 stripes, the middle one divided; the plura, humeri, and space 

 between the dorsal stripes, yellow; a spot on the pleura, the 

 sternum, scutellum and metanotum subshining black. Hairs on 

 dorsum black. Abdomen wholly fuscous or subfuscous, the 

 hairs and the genitalia somewhat paler. Coxae fuscous, the 

 trochanters and bases of femora yellow; remaining parts of the 

 legs sordidly yellow or pale fuscous; the fore metatarsus about 

 tw^o thirds as long as its tibia. Wings hairy, hyaline, very slightly 

 smoky; U^-u- extends nearly to the tip of the wing; costa extends 

 a little beyond the tip of R4-f-.-, ; venation as figured. Halteres 

 yellowish. Length 2 mm. Tavo specimens, Ithaca, N. Y. 



