NO. 1530. THE DECTICIN^ OF NORTH AMERICA— CA UDELL. 375 



curved upwards and curved downwards, occur, but the degree of 

 curvature is slight and valueless as a character of more than specific 

 value. 



As stated under the discussion of Eremojpedes^ there is some rela- 

 tionship between that genus and Idlostatus. 



The species of Idmstatas are quite numerous as compared with most 

 of our Dectician genera, and to facilitate their easy differentiation two 

 tables are given, one of the males and one of the females. The fol- 

 lowing tables have been prepared with considerable care, and, I trust, 

 will he found as functionable as compatible with the classifactor}^ dif- 

 hculties of the objects treated. 



KEY TO THE SPECIES OF IDIOSTATUS MALES. 



(Males unknown of femorala and varieguta.) 



A. Cerci round or somewhat depressed, apically very unlike that of inermis as tabu- 

 lated under the alternate category. 

 B. Cerci with an inner tooth, not like fig. 61. 

 C. Cerci beyond the tooth short and triangular or swollen, not like fig. 64. 

 D. Tooth of the cerci somewhat incurved apically; cerci between the tooth 

 and the tip concave, figs. 66, 67. 

 E. Cereal too'th apically sharp and slender, no more than one-fourth as 

 thick as the apical portion of the cercus itself. 

 F. Smaller, total length 20 mm., of pronotum 6-8 mm. . .herma7iii, p. 381 

 F^. Larger, total length 30 mm., of pronotum 9-10 mm . .bilineatus, p. 379 

 E^. Cereal tooth apically less sharp, thicker than the apical portion of the 



cercus itself fiiscopunctahis, p. 382 



I)^. Tooth of cerci not incurved; cerci between the tooth and the tip straight 

 or convex, figs. 70, 72. 

 E. Tooth of cerci triangular; cerci beyond the tooth acute triangular, fig. 



70 rehni, p. 382 



E'. Tooth of cerci slender; cerci beyond the tooth swollen, fig. 72. 



elegans, p. 384 

 C. Cerci beyond the tooth long and slender, much longer than the tooth itself, 



fig. 64 diLvata, p. 378 



B'. Cerci with an outer tooth or shoulder, like fig. 61. 

 C. Apical projections of the last abdominal segment triangular, short, separated 



by a V-shaped cleft, fig. 63 nevadensis, p. 378 



C. Apical i:>rojections of the last abdominal segment slender, accuminate, sepa- 

 rated by a U-shaped cleft, fig. 62 sequalis, p 376 



A'. Cerci basally somewhat compressed and apically forming two depressed incurved 

 teeth, fig. 73 inermis, p. 386 



KEY TO THE SPECIES OF IDIOSTATUS — FEMALES. 



(Females unknown of rievadensis, sinuatn, and /((scopiinctdtn.) 



A. Ovipositor almost as long, or longer than, the posterior femora. 



B. Size smaller and more slender, the pronotum less than 9 mm. in length rarely, 

 rehni and hermanii more than 6 mm. 

 C. Ovipositor straight or curved gently upwards; pronotum, except in hermanii, 

 less than 6 mm. in length. 

 D. Larger, pronotum more than 7 mm. in length Iiernumil, p. 381 



