SCUDDER. — NORTH AMERICAN TRYXALTN.E. 43 



than its length beyond the narrowest part of the vertex, being triangular 

 ( (^ ) or suhtriangular ( 9 )> ^'hh straight (^) or arcuate (9) sides and 

 blunt apex, the margins slightly ascending, and with faint or no median 

 carina. The median carina of the pronotum is pronounced throughout, 

 the lateral cariuce feeble, and the disk of the pronotum considerably more 

 than twice as long as broad, especially in the male, the transverse sulci 

 rather feebly impressed. The tegmina reach about to the tip of the 

 abdomen and are immaculate, with the base of the median area in- 

 fuscated and bordered by a submarginal costal flavous streak, as fre- 

 quently in M. bifittata. The hind femora are slender, and reach as far 

 back as the tegmina in both sexes. Last ventral segment of male a 

 little more elongate and gradually acuminate than in M. bivittata. 



Length of body, $, 38 mm., 9 56 mm. ; pronotum, ^, 6 mm., 9, 

 8 5 mm. ; tegmina, ^, 27 mm., 9, 39 mm. ; hind femora, ^ , 2L5 mm,, 

 9,31 mm. 



2 $ , 2 9 • Georgia, Morrison ; P^agle Pass, Tex., Schott. 



Mermiria alacris Scudd. 



I have seen specimens only from Georgia, Morrison ; Sandford, Fla., 

 P'razer ; and Dallas, Tex., Boll. 



Mermiria neomexicana (Thom.). 



My specimens come only from Pueblo, Col., Aug. 30, 31 ; Dallas, 

 Boll, and Bosque Co., Tex., Belfrage. McNeill says it occurs from 

 Wyoming to New Mexico and eastward to Georgia. I suspect his 

 Georgia reference may be due to my remarks in describing M. alacris, 

 where I speak of the present species as occurring in Georgia, but I now 

 think that was a mistake. 



Mermiria vigilans sp. nov. 

 Dull olivaceous with purplish and flavous markings, particularly the 

 former. The head has a broad mediodorsal purplish fuscous stripe, 

 broadening a little in passing backward, and as broad, at least poste- 

 riorly, as the fastigium ; this is separated by a narrow flavous stripe 

 from a broad and equal light purplish postocular stripe which continues 

 over the upper part of the lateral lobes of the pronotum ; below this the 

 genfe are olivaceous clouded with flavous, while the face is infuscated. 

 The pronotum is dull flavo-olivaceous, the disk often with a faint pur- 

 plish median stripe, and the lateral lobes narrowly margined below with 



