SHORT STUDIES OF NORTH AMERICAN TRYXALIN.E. 



By Samuel H. Scudder. 



Received June 6, 1899. Presented June 14, 1899. 



The review of a large series of Tryxalinoe collected on the Pacific 

 coast in 1897 by Mr. A. P. Morse, and kindly placed unreservedly in 

 my hands, has provoked a re-examination of the species in a number of 

 genera scattered through the group. I have published elsewhere (Can. 

 Ent., XXXI. 177) a review of our species of Orphulella, and here gather 

 together other miscellaneous studies, all referring to the Tryxalinas. 



1. The United States Speciks of Mermiria. 



A recent study of our Mermiria} has brought to light a couple of new 

 species of Mermiria, and some slight extension of the known range of 

 some of the other species, so that I venture to publish the following 

 notes and descriptions, with a new table of the species, based primarily 

 on that published by McNeill. 



Table of the United States Species of Mermiria. 



a 1 . Head shorter than pronotum, or, if (rarely) as long, then the greatest width of 

 the fastigium is greater than its length beyond narrowest part of vertex; last 

 ventral segment of male bluntly acuminate. 



b 1 . Fastigium less prominent and blunter, its greatest hreadth being consider- 

 ably greater than its length beyond narrowest part of vertex, especially in the 

 female. 

 c 1 . Stouter, the hind femora shorter, not reaching the tips of the tegmina in 

 the female ; disk of pronotum, in female, hardly or not more than twice as 

 long as greatest breadth ; head with a broad occipital fuscous band. 



texana Brun. 

 c. 2 Slenderer, the hind femora longer, reaching the tips of the tegmina in the 

 female ; disk of pronotum distinctly, generally much, more than twice as long 

 a° greatest breadth ; head with a narrow occipital band or none. 



bivittata Serv. 

 t 2 . Fastigium of vertex more prominent and angulate, its greatest breadth 

 being scarcely greater, even in the female, than its length beyond narrowest 

 part of vertex ; disk of pronotum considerably more than twice as long as 

 greatest breadth intertexta sp. nov. 



