108 D1PTERA OF NORTH AMERICA. 



Gen. II. TETA3VOCERA Dum. 



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. j 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 (he Species.* 

 , f Wings reticulated. 2 



I Wings not reticulated. 11 



o f Bristle of the antenna? plumose with hlack. 3 



t Bristle of the antennae plumose with white. 6 



o ( Front with three shining stripes. 4 



( Front without shining stripes. 5 



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



Posterior transverse vein almost perpendicular and straight. 

 2 valida, n. sp. 

 f. ( Femora spotted. 3 pictipes Loeic. 



\ Femora quite unspotted. 4 pallida Loeic. 



7 



P ( Thorax without stripes. 



( Thorax with stripes. S 



_ ( Femora entirely yellow. 5 flavescens Loexv. 



\ Femora very brownish at the base. G arcilata Loew. 



(The brown margin of the costal border of the wings interrupted by clear 

 spots. 9 



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. S sparsa, n. sp. 



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



I Posterior transverse vein much curved. 10 saratogensis Fitch. 



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

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

 lique. 12 plumosa Lot w. 



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

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



