NO. 1530. THE DECTICINM OF NORTH AMERICA— C A UDELL. 385 



and one-half times as long- as the pronotum, much swollen on the basal 

 two-thirds and armed beneath with several very short, triangular, black 

 spines; anterior tibiae armed above on the outer side only with three 

 spines. Elytra in the mah^ overlapping- above and extending be3^ond 

 the pronotum a distance a little less than one-half the length of the 

 pronotum, of the female broad, almost touching above and projecting 

 beyond the pronotum a distance equal to about one-fourth the pronotal 

 length. Abdomen plump, scarcely carinate; last abdominal segment 

 apically depressed and mesially roundly incised; cerci of the male thick 

 and broad, apically roundly tapering- to a point and armed on the inner 

 side with a sharp spine (tig. 72); cerci of the female short and stout, 

 about two and one-half times as long as the 

 basal breadth and rapidly tapering to a point. 

 Ovipositor longer than the posterior femora 

 and nearly straight, apicall}^ very slightly up- 

 curved. 



Color reddish brown, in the male lighter, 

 marked with black. The head has a broad 



Fk;. 72.— Idiostatus elegans. 



black postocular stripe and a black streak on cercus and last dorsal 

 the top. Pronotum mesially marked with a abdominal segment of 

 triangular black spot and behind with a sul)- 



marginal broad black transverse stripe extending' halfway down the 

 side of the lateral lobes, more conspicuous in the male. Elytra 

 yellow with paler veins. Abdomen with the last two seg-ments shiny 

 black, except the mesial emargination of the terminal one. Ovi- 

 positor black, yellowish apically and below basalh'. Posterior femora 

 marked with black above at the base, on the outer face mesiall}" 

 and at the tip. The spines of the femora and the posterior tibiiv are 

 black, and both femora and tibiie of all the legs are black at the base 

 of the spines. 



Measurementa. — ^Length, pronotum, male, 9 mm., female, 9.5; pos- 

 terior femora, male, 22, female, 24; elytra, male, 4.5, female, 8; ovi- 

 positor, 26; width, pronotum across metazona, male, 6.5, female, 7; 

 posterior femora at the narrowest point, male, 1.5, female, 1.5; at the 

 widest point, male, 5.25, female, 5.5; ovipositor in the middle, 2. 



Types.— Qj2.i.. No. 10185, U. S. National Museum. 



Specimens examined. — The types, one male (tig. 71), one female, 

 Nevada (E. H. Hillman). 



This robust and prettily marked species, which was secured from 

 the collection of Bruner, reminds one somewhat of an Anahrus.^ but it 

 is not related to that genus. 



Proc. N. M. vol. xxxii— 07 25 



