REHN AND HEBARD 119 



low to pale yellow-green, the pale section of the prozonal lines 

 occasionally weak; dorsum of the pronotum more or less thickly, 

 completely and decidedly punctulate with pansy purple to burnt 

 lake, lateral lobes occasionally (in allotype) with similar punctula- 

 tions. Tegmina with the area of the male stridulating field be- 

 tween the speculum and the anal vein seal brown, the anal vein 

 lined with madder brown. Abdomen with the lateral lines only 

 indicated by narrow areas of the general color unmarked by punc- 

 tulations of pansy purple to burnt lake, which thickly and uniformly 

 cover the remainder of the dorsal and lateral aspects of the ab- 

 domen, coalescing into a line ventrad of the pale line on the proxi- 

 mo-dorsal abdominal segment. Extremity of the abdomen of the 

 male more yellowish than the body, inclining toward aniUne yellow. 

 Limbs more or less washed with purplish as in other species of the 

 genus, rarely with a suffusion of hoary white as well (in allotype), 

 tibiae of the general color. Ovipositor with denticulations black- 

 ish brown. 



Distribution. — The present species is only known from two locali- 

 ties, one (Marathon) in western Texas, the other (Montelovez) 

 in Coahuila, Mexico. The former locality is directly east of the 

 main chain of elevations of that region. 



Biological Notes. — This very peculiar species was found by us to 

 be very scarce, occurring in an area of high green grasses inter- 

 spersed with various plants. Here it was taken adult August 

 26 and 27 and again September 12 and 13. A single female in the 

 instar preceding maturity was taken on the first visit, so it is prob- 

 able that the species does not reach maturity much before the latter 

 part of August. 



Morphological Notes. — The only important difference m struc- 

 ture noticed in the series is also one of size. The two females 

 exhibit a disparity in the length of the tegmina and wings, as shown 

 in the table of measurements. The allotype has the tegmina about 

 reaching the tips of the caudal femora and subequal in width for a 

 considerable portion of their length, the wings of the usual form and 

 surpassing the tegmina by more than a quarter of the length of the 

 latter. In the Montelovez female the tegmina are only half as 

 long as in the allotype, tapering regularly for the greater part of 

 their length, with a very narrowly rounded apex, the wings sur- 

 passing the tegmina as mere tips. This variation in alar length 



TRANS. AM. ENT. SOC, XL. 



