MAY FLIES AND MIDGES OF NEW YORK 277 



brown, venter lighter, genitalia small. Antennae and its hairs 

 brown. Legs yellow or sordidly white, nearly bare; fore metatar- 

 sus only one half as long as its tibia; bare. Wings whitish, 

 immaculate. Halteres white. Length 1 to 1.3 mm. Schiner, 

 loe. cit. Greenland, Lundbeck. Ithaca, N. Y. 



11. Orthocladius difficilis Lundbeck 



1898 C h i r o n m u s Lundb. Vidensk. Meddel. p.282, 67 

 1902 Orthocladius Kertesz. Cat'l. Dipt. 1:217 



Male. Thorax yellow or reddish yellow, with three dark brown 

 stripes, the median posteriorly, the lateral ones anteriorly abbre- 

 viated. Scutellum yellow, the metathorax brown, the pleura 

 yellow, the sternum brown ; abdomen fuscous black, yellow pilose, 

 the base and the venter yellow. The antennae brown; the palpi 

 sordidly yellow. Legs yellow; the tip of each of the tibiae black- 

 ish brown. Halteres yellow; wings almost hyaline, the anal lobe 

 produced, right angled, rounded at the apex; the veins pale and 

 thin, a little stronger and darker at the costal margin, R4+5 

 straight, and enters the margin of the wing a little distad of the 

 Cu^; the costa is not produced beyond the tip of the wing, the 

 media is straight and enters the tip of the wing, the fork of the 

 cubitus lies below the base of R4+3, its upper branch is a little 

 longer than the main trunk, the lower branch is lightly curved 

 at the tip. The middle and hind pairs of legs are hairy or pilose, 

 the fore metatarsus is a little shorter than the tibia. 



Female. Is a little smaller than the male, and the base of the 

 abdomen is but little or not at all yellow ; in other respects like 

 the male. Length of male and female 2 to 2.25 mm. Greenland, 

 Lundbeck. 



12. Orthocladius absurdus n. sp. * 



(P1.30, fig.9; pl.31, fig.8; pl.33, fig.7) 



Female. Yellowish brown, including the legs. Genitalia with 

 peculiar clasper-like egg guides. Length 3 mm. Head yellowish 

 brown, including proboscis, palpi and antennae, the basal joint 

 of the last yellow; first joint disk-like, the incisure between the 

 second and third not sharply marked, the seventh elongate (pl.31, 

 fig.8). Thorax, including scutellum, pale yellowish brown; the 

 three dorsal stripes, the metanotum, a spot on the pleura and 

 the pectus darker brown. Abdomen yellowish with a greenish 

 tinge, the dorsum of each segment brownish, except on both 

 sides of each incisure narrowly pale yellow. Hairs pale and 

 sparse. Genitalia with the usual lobes of the female, but in 

 addition a pair of slender arms each with six or seven long setae 

 at the extremity (pl.33, fig.7). Legs uniformly yellowish brown; 



