TWO GENERA OF NORTH AMERICAN DECTICINyE. 



By Samuel II. Scudder. 

 Received September 4, 1899. 



I. Tropizaspis. 



Tropizaspis was founded by Brunner in 1893 (Rev. Syst. Orth., 187), 

 but without specification of species, except that the author knew of but 

 one, coming from Washington Territory. As Arytropteris steindachneri 

 from Puget Sound, described by Herman in 1874 from specimens in 

 Brunner's collection, belongs here, as indicated by me in 1894 (Can. 

 Knt., XXVI. 180), and is the only species hitherto described, it should 

 doubtless be regarded as the type. Others are now described, but appar- 

 ently none of them are as common as that described by Herman, which 

 is found over a great extent of country, even beyond the Pacific coast, 

 as it has occurred in Texas and possibly in Nebraska, as will be seen 

 below. The species may be separated by the following table : — 



Table of the Species ok Tropizaspis. 



A 1 . Hind femora scarcely or not more than half as long again as the pronotum, at 

 least in the male. 



b 1 . Lateral carinas of pronotum diverging continuously from the very base; 

 supraanal plate of male triangular, apically rectangulate; anal cerci scarcely 

 longer than basal breadth ; supragenital plates very large, overlapping each 

 other and the lateral margins of the subgenital plate, together apically rounded ; 



subgenital plate with distinct though small styles ovata. 



//-. Lateral carina? converging on the prozona and then diverging; supraanal 

 plate of male quadrangular, apically transverse ; anal cerci nearly twice as long 

 as basal breadth ; supragenital plates relatively small, attingent, together apically 

 slightly acutangulate, not reaching lateral margins of subgenital plate ; the latter 



with minute, scarcely noticeable styles castanea. 



A 2 . Hind femora twice or almost twice as long as pronotum ; lateral carina? of pro- 

 notum converging on the prozona and then diverging. 



b 1 . Pronotum broadest far behind the middle of the metazona in both sexes ; 

 ovipositor rather gently curved. 



c 1 . Disk of pronotum irregularly mottled; ovipositor slightly narrowed in the 

 middle (where it is narrower than the frontal fastigium) and faintly enlarged 

 beyond picturata. 



