1914.] NATURAL SCIENCES OF PHILADELPHIA. 7'S. 



HH. — Margins of the cereal lobe hardly 

 converging clistad, the apex sub- 

 truncate, ventral margin of the lobe- 

 weakly cingulate calinata n. sp. 



AAA. — Cercus with a dorsal median tooth and an accessory digiti- 

 form lobe attached at the dorsal base. 

 B. — Tegmina shorter than the pronotum, the portion of the 

 anal field of former distad of stridulating vein very 

 brief, sutural margin at apex of this vein decidedly 

 produced. Cercus with the median tooth proportion- 

 ately longer tridactyla n. sp. 



BB. — Tegmina longer than the pronotum, the portion of the anal 

 field of former distad of stridulating vein normal,, 

 sutural margin at apex of this vein slightly produced. 

 Cercus with the median tooth proportionately shorter, 



caudelli n. sp> 

 Females. 



A. — Ovipositor very decidedly longer than the head and pronotum 

 together.^ 

 B. — Tegmina slightly overlapping mesad. 



C. — Ovipositor hardly or not at all longer than half the 

 length of the caudal femora. Subgenital plate not 

 produced laterad into large trigonal lobes. 

 D. — Size large (body 21.5 mm., pronotum 6.9, ovipositor 



14.5). Ovipositor slenderer falcata n. sp. 



DD. — Size medium (body 15.5-18.2 mm., pronotum 

 4.1-^.3, ovipositor 10.2-10.5). Ovipositor more 



robust : durangensis n. sp. 



CC. — Ovipositor distinctly longer than half the length of the 

 caudal femora. Subgenital plate produced laterad 

 into large trigonal lobes. (Size medium; pronotum 



not sellate.) tauriformis n. sp. 



BB. — Tegmina not attingent or subattingent mesad. 



C. — ^Subgenital plate compressed, truncate, shallowly 

 arcuato-emarginate or biconvexo-emarginate distad. 



mexicana Brunner. 

 CC. — Subgenital plate with distal margin very profoundlj- 

 triangularly emarginate or broadly divided to the 

 base. 

 D. — Form slender, subcompressed. Pronotum narrow, 

 elongate (of the t\T)e usual in the genus). Limbs 

 and ovipositor proportionately longer than in 

 the opposite category. 

 E. — Subgenital plate with lateral apices very acute, 

 more or less spiniform. 



9 Occasional specimens of D. brevihastata , which belong to the opposite cate- 

 gory, have the ovipositor appreciably though not decidedly longer than the hearf 

 and pronotum. These specimens are exceptional and do not represent the- 

 average condition of the species. 



