108 D1PTERA OP NORTH AMERICA. 



Gen. II. TETAtfOCERA BUM. 



Among the recorded N. A. species of Tetanocera, Tet. boscii 

 has been characterized so insufficiently by Rob. Desvoidy, that 

 there is no possibility of identifying it. Tet. canadensis, described 

 by Macquart, is also unknown to me. Tet. guttularis Wied. is. 

 mentioned by Macquart as a native of North America; but I must 

 consider this statement as a mistake, since the characters he gives 

 do not agree with the description of Tet. guttularis Wied. ; but 

 what species he has taken for Tet. guttularis has not as yet been 

 made out. As to the other described species, the following paper 

 will give all the necessary information : 



Synopsis of the Species.* 



-. f Wings reticulated. 2 



I- Wings not reticulated. 11 



2 f Bristle of the antennse plumose with black. 3 



I Bristle of the antennje plumose with white. 6 



o f Front with three shining stripes. 4 



' Front without shining stripes. 5 



f Posterior transverse vein oblique and curved. 1 clara, n. sp. 



4 < Posterior transverse vein almost perpendicular and straight. 



2 valida, n. sp. 

 g f Femora spotted. 3 pictipes Loew. 



\ Femora quite unspotted. 4 pallida Loew. 



( Thorax without stripes. 7 



( Thorax with stripes. 8 



,- | Femora entirely yellow. 5 flavescens Loew. 



(. Femora very brownish at the base. 6 arcuata Loew. 



/- The brown margin of the costal border of the wings interrupted by clear 

 8 spots. 9 



I Costal border of the wings with an uninterrupted brown margin. 10 



!The reticulation of the wings shows double bands consisting of spots 

 arranged by pairs. 7 combinata Loew. 



The reticulation forms no double bands at all. 8 sparsa, n. sp. 



,^ f Posterior transverse vein straight. 9 costalis, n. sp. 



*- Posterior transverse vein much curved. 10 saratogensis Fitch. 



. f Posterior transverse vein curved and rather steep. 11 plebeja, n. sp. 

 11 < Posterior transverse vein curved in the shape of an S, and very ob- 

 lique. 12 plumosa Loew. 



* The two species (Nos. 13 and 14), added when the manuscript was 

 already in press, are not included in this synopsis. 0. S. 



