296 NEW YORK STATE MUSEUM 



infuscated, with pale bairs, basal joint yellow; palpi elongate; 

 the eyes conspicuously black, deeply notched. Thorax wholly yel- 

 low, with three butf-colored, sometimes indistinct, dorsal stripes. 

 Abdomen quite pale green, very slender and with pale hairs ; geni- 

 talia (pl.33, figs.4 and 4a) yellow, with four pairs of appendages; 

 an elongate pair of lateral lobes with upturned ends (1), a pair of 

 elongate interior lobes Avith rounded ends (i), a pair of short 

 superior lobes with sharp ai)ex and recurved setae (s), a pair of 

 mesad projecting brushlike appendages (a), and finally a curved 

 dorsal keel (d). Legs wholly cream white, tijis of middle and 

 hind tibiae each with two tiny black combs, one tooth of each 

 comb being prolonged into a short spur. Legs rather hairy; fore 

 metatarsus nearly three fourths longer than its tibia. Wings 

 white, hyaline, spotless, hairy, margin with long fringe, veins 

 pale. Anterior veins closely crowded towards costal margin, so 

 that the veins are difficult to distinguish. Halteres white. 

 Length 1 .5 to 2 mm. 



Female. Like the male, differing only as follows : A little 

 shorter, antennae yellow, last joint dark on the lateral surface; 

 abdomen shorter and broader, and often entirely yellow, though 

 sometimes green. 



This species is very common among the shrubbei'y near swift- 

 flowing brooks. Ithada N. Y. 



14. Tanytarsus tenuis Meigen 



1830 Chironomus Meigen. Syst. Beschr. 0:2,55, 112 

 1850 Chironomus Zett. Dipt. Scand. 9 : 3581, 113 

 1864 C ti i !• o n o m 11 s Schiuer. Fauna Austr. 2 : 598 

 1874 Tanytarsus V. d. Wulp. Tijd. v. Ent. 17 : 134 

 1877 Tanytarsus V. d. Wulp. Dipt'. Need. p. 288, 11 

 1898 Cliirouomus Luudb. Videusk. Meddel. p.284, 70 



Pale greenish yellow; dorsum of the thorax Avith three ferru- 

 ginous longitudinal stripes; sternum and metathorax also fer- 

 ruginous. Abdomen of the male very slender, somewhat darkened 

 toward the end, and with long claspers. Antennae yellowish, the 

 hairs appearing lighter; palpi dark brown. Legs pale yellow, the 

 tibiae witli black spots at the tip; fore metatarsus twice as long 

 as its tibia. Wings whitish, delicately haired. Halteres pale 

 yellow. Length 2 to 3 mm. Schiner, loc. cit. rireonland. Lund- 

 beck. Specimens from South Dakota and Washington seem to be 

 this species. 



15. Tanytarsus flavellus Zetterstedt 



1838 C h i r o n o m u s Zett. Ins. Lappon. p.816, 41 

 1850 C b i r o n o in u s Zett. Dipt. Scand. 9 : 3584, 117 

 18G4 Chironomus Schiuer. Fauna Austr. 2:598 



