156 NEW YORK STATE MUSEUM 



it appears to me that the name should be retained for species 

 having this character. 



KEY TO SPECIES OF TANYPUS 



Imagines 

 a Wings clouded (banded or spotted) 



1) Legs nearly uniform in color ; wings uniformly spotted with fuscous ; 

 thorax with three dusky stripes ; legs yellow ; length 4.5 mm. ; 



female Ablabesmyia pictipennis 



Z>& Legs distinctly bicolored. Femora brownish with white subapical 



rings ; abdomen blackish (New York and Texas) ....1. stellatus 



aa Wings not clouded, excepting sometimes the crossveins or a faint smoki- 



ness near apical end ; dusky species 



7> Halteres pale fuscous; blackish species; legs sordidly yellowish 

 brown ; wings grayish, hairy ; tibia long-haired ; thorax dark ; abdo- 

 men somewhat shining and fuscous haired ; anterior crossvein in the 

 middle of wing; length 2.5mm. (Greenland) 



21. Ablabesmyia tibialis 

 5& Not as above 

 c Scutellurn black ; legs usually brownish or black 



d Apical half of wing smoky ; abdomen brown. .4. culiciformis 

 dd Apical half of wing not smoky 



e Thorax gray with black stripes ; abdomen cinereous black ; 

 M-Cn crossvein far proximad of the fork of the cubitus ; haJ- 

 teres sordidly yellow; fore metatarsus but little more than 

 half as long as the tibia ; length 2 to 3.25 mm. 



2. posticalis 



ee Thorax with lateral ferruginous stripes; crossveins clouded; 

 fore metatarsus about three fourths as long as its tibia ; 



length 4 mm 3. crassinervis 



cc Scutellum yellowish ; legs usually paler brown or yellow 



d Apical half of wing distinctly smoky, especially near the anterior 

 margin; abdomen dark brown; length 3.5 to 4.5 mm. (New 



York ) 4. culiciformis 



dd Wing nearly hyaline ; abdomen with whitish incisures 



5. choreus 



The species pictipennis and tibialis Staeger 

 have been included in the foregoing as well as in the key for 

 Ablabesmyia because there is some doubt as to the posi- 

 tion of the M-Cu. crossvein. They are, however, described with 

 Ablabesmyia. 



Tanypus tibialis Say (6) and Tanypus balti- 

 moreus Macq. (7) are not sufficiently described to place in 

 the keys ; both of these descriptions are reproduced in the body 

 of this work. Tanypus annulatus is a synonym of 

 A . m o n i 1 i S , and T. decedens Walker is perhaps the 

 same as pictipennis Zett. 



