29G NEW YORK STATE MUSEUM 



infuscated, with pale hairs, basal joiut yellow; palpi elongate; 

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

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

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

 talia (i)1.38, 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 with rounded ends (i), a pair of short 

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

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

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

 hind tibiae each with tAvo 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 Avith long fringe, veins 

 pale. Anterior A'eins closely croAvded 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 yelloAV, 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 shrubbery near swift- 

 flowing brooks. Ithada N. Y. 



14. Tanytarsus tenuis ^leigen 



1830 C b i r o u o in n s Meigen. Syst. Beschr. fi : 255, 112 



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



1864 Cbironomus Scbiner. Fauua Aiistr. 2 : 598 



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



1877 Tanytarsus Y. d. Wulp. Dipt". Neerl. p. 288, 11 



1898 Cbironomus Lundb. Yideusli. Meddel. p.284, 70 



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

 ginous longitudinal strijjes; sternum and metathorax also fer- 

 ruginous. Abdomen of the male A'ery slender, somewhat darkened 

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

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

 tibiae with 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. Greenland. Lund- 

 beck. Specimens from South Dakota and Washington seem to be 

 this species. 



15. Tanytarsus flavellus Zetterstedt 



1838 Cbironomus Zett. Ins. Lappon. p.81G, 41 

 1850 Cbironomus Zett. Dipt. Scand. 9 : 3584, 117 

 18G4 Cbironomus Scbiner. Fauna Austr. 2:598 



