138 PROCEEDINGS O^ THE ACADEMY OF [Jan., 



and. occurred with D. hrevihastata) it was taken between 3,900 and 

 4,160 feet, while in the Davis Mountains it occurred in Lower Limpia 

 Canyon at 4,900 feet, at Maguires Ranch in Upper Limpia Canyon 

 at 5,600 feet and on the slopes of Pine Mountain at 6,500 feet. In 

 the Chisos Mountains it was secured at Moss Well at 4,500-5,300 

 feet, in the canyon behind Pulliam Bluff at 4,600-5,000 feet and on 

 the slopes of Lost Mine Peak at 6,000 feet. The vertical range of 

 the species is thus seen^ at least in Texas, to extend from about 3,900 

 to 6,500 feet. 



Biological Notes. — This peculiar species has been found in a number 

 of situations, on bare rock, in grasses and weeds, in a number of 

 species of shrubby plants and in low trees, once in a nogal or walnut 

 tree {Juglans rupestris). In such places they climb gingerly about, 

 at night giving occasionally a very faint lisping stridulation, of a 

 tinkling, sibilant character, which can be represented by zip-a zip-a 

 zip-a zip-ip-ip-ip, the last portion being given infrequently and then 

 very rapidly. This note can scarcely be heard at a distance greater 

 than six feet. 



Morphological Notes. — In the male the greatest morphological 

 variation appears to be that in the angulation of the distal margin 

 of the subgenital plate, this being more broadly obtuse-angulate in 

 many specimens than in the type, while the bottom of the emargina- 

 tion is nearly rounded in one individual. The male tegmina vary 

 somewhat in bulk, this causing the disto-sutural margin to appear 

 nearly straight in those having the longest tegmina and more or less 

 arcuate (or subangulate) at the apex of the anal vein in those with 

 shorter tegmina. The caudal margin of the disk of the pronotum 

 is truncate in some and feebly emarginate in other specimens, but 

 weakly arcuate (as in the type) in the majority. The female tegmina 

 vary consideral)ly in proportionate size, and the interspace between 

 the same consequently shows an equal amount of variation, ranging 

 from but little over half to that of a whole tegmen width . The oviposi- 

 tor exhibits similar variation in depth to that seen in certain other 

 species of the genus, in the majority of specimens the distal half being 

 su])equal in depth and tapering only in the proximal half, although 

 the form of the margins remains practically the same. The spines 

 at the distal extremity of the ovipositor vary in number from seven 

 -to nine dorsad and seven to ten ventrad. 



Remarks. — The peculiar characters of the male of this form imme- 

 •diately separate it from all of its congeners except catinata, from which 

 it can readily be distinguished l)y the lob(> of the cercus not being 



