1914.] NATURAL SCIENCES OF PHILADELPHIA. 65 



and Angara Bruiiner a section of the group. Of these genera all are 

 exchisively Old World except Angara, which is Brazilian. 



Generic Description. — Fastigium of vertex more or less'compressed, 

 short, not or distinctly sublamellate, not at all sulcate or finely 

 sulcate proximad, more or less in contact with facial fastigium. 

 Antennae subcrassate proximad, from two to five times the length 

 of the body. Pronotum not at all, or more or less constricted mesad, 

 dorsum more or less arcuate in transverse section; caudal margins 

 of lateral lobes more or less arcuate or subtruncate. Tegmina in 

 male abbreviate; anal field extending nearly the entire length of 

 tegmen; sutural margin at apex of stridulating vein obtuse-angulate 

 to rectangulate produced. Tegmina in female very short, not 

 reaching or distinctly surpassing the caudal margin of the metanotum, 

 overlapping, subcontiguous, or more or less decidedly remote from 

 one another; distal margin of female tegmina arcuate to truncate. 

 Abdomen more or less dilated; disto-dorsal abdominal segment 

 with distal margin emarginate, bisinuate, truncate or arcuate, supra- 

 anal plate simple or (in d^ of tauriformis) bearing a dorsal erect 

 T-shaped structure. Cerci of male incurved, acute, falciform, 

 simple, with dorsal margin rarely serrato-dentate or with median 

 tooth or lobe on dorsal or external face, occasionally with an accessory 

 digitiform lobe from base. Subgenital plate of male broad and short 

 or produced, more or less narrowed cUstad, free lateral margins 

 concave, subparallel or converging, distal margin truncate or more 

 or less deeply and completely V- or obomegoid emarginate, unicari- 

 nate or tricarinate ventrad. Ovipositor from one and one-half to 

 three times the length of pronotal disk, more or less arcuate, apex 

 more or less acuminate and with its margins serrato-dentate. Sub- 

 genital plate of female emarginato-truncate, arcuato-emarginate, or 

 more or less completely divided into two halves, these more or "less 

 acute distad. Limbs more or less-elongate. Cephalic femora from one 

 and one-half to three times as long as the disk of the pronotum in 

 the male, one and one-third to two and one-half times in the female. 

 Caudal femora -from four to nearly seven times the lengih of the 

 pronotal disk in the male, from four to five and three-fourths times 

 in the female. 



Classification. — From a systematic standpoint, the characters of 

 greatest value in the differentiation of the species are: in both sexes, 

 general form of the body and shape of the eyes; in the male, form of 

 the pronotum, form of the tegmina, form of the cerci and subgenital 

 plate; in the female, form of the pronotum, form of the tegmina, 



