156 NEW YORK STATE MUSEUM 



it appears to nie tliat the name should be retained for species 

 having this character. 



KEY TO SPECIES OF TANYPUS 



Imaffincs 

 a Wings cloiidecl (banded or spotted) 



h Legs nearly uniform in color ; wings uniformly spotted with fuscous ; 

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



female Ablabesmyia pictipeunis 



?>?> 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 

 h 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 

 ?>?> Not as above 

 c Scutellum black ; legs usually brownish or black 



d Apical half of wing smoky ; abdomen brown. .4. c u 1 i c i f o r m i s 

 (Id Apical half of wing not smoky 



e Thorax gray with black stripes ; abdomen cinereous black ; 

 M-Cu crossvein far proximad of the fork of the cubitus ; hal- 

 teres sordidly yellow ; fore metatarsus but little more than 

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



2. posticalis 



ec Thorax with lateral ferruginous stripes ; crossveins clouded ; 



fore metatarsus about three fourths as long as its tibia ; 



length 4 mm 3. c r a s s i n e r v i s 



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. c h o r e u s 



The species \) i c t i p e n n i s 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. The}' are, however, described with 

 A, blabesmyia. 



Tanypus tibialis Say (6) and Tanypus bal ti- 

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

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

 of this work. Tanypus a n n u 1 a t u s is a synonym of 

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

 same as pictipennis Zett. 



