386 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XX. 



metazona finely and closely punctate, slightly tumid in the female, 

 the angle of the lateral carinae well rounded, the posterior border 

 broadly angulato-convex, margined ; median carina obsolete or sub- 

 obsolete throughout. Prosternal spine slender, straight, acuminate; 

 meso- and metastethia together longer than broad; interval between 

 mesothoracic lobes distinctly, generally very much, longer than broad, 

 generally broader in the female than in the male, the metasternal lobes 

 subattingent or approximate, the portion of the metasternum behind 

 the lobes small, hardly more than twice as broad as long. Tegmiua 

 fully developed in all known species, remarkably uniform in width, 

 with the costa very slightly expanded near the base, and a strongly 

 and uniformly rounded apex. Hind femora moderately slender, with 

 immaculate inferior genicular lobes, the tibiae with eight to nine exter- 

 nal spines. Cerci of male extremely slender beyond the tapering lami- 

 nate base, thefurcula subobsolete; the lateral margins of the subgenital 

 plate ampliate at base and the apex provided with a distinct tubercle; 

 the pallium often has a pyramidal erection. 



P. picticornis (Thomas) may be regarded as the type. 



As far as known, this genus occurs only on the Pacific coast, near 

 our southern borders. It is remarkable for the tuberculate abdomen, 

 resembling Helper otettix, but apical instead of subapical, and for the 

 sometimes vivid and always exceptionally variegated colorings of its 

 different species. 



ANALYTICAL KEY TO THE SPECIES OF PGECILOTETTIX. 



A 1 . Antennae annulate and pronotum and femora distinctly and distantly punctate 

 with blackish fuscous ; antennae hardly attenuate apically ; eyes of female anteriorly 

 truncate; apical tubercle of male abdomen raised above the level of the sides of the 



subgenital plate 1. picticornis (p. 386). 



A 2 . Antennae coucolorous, distinctly attenuate apically: eyes of female anteriorly 

 subtruncate ; pronotum and femora variegated with red and brown ; apical tubercle 

 of male abdomen not elevated above the sides of the subgenital plate. 

 fe 1 . Relatively stout-bodied, with stout femora; apex of male abdomen with a bifid 



tubercle 2. sanguineus (p. 387). 



ft 2 . Relatively slender-bodied, with slender femora; apex of male abdomen with a 

 simple conical tubercle 3. coccinatus (p. 389). 



i. POECILOTETTIX PICTICORNIS. 

 (Plate XXVI, fig. 1.) 



Caloptenus (Hesperotettix) picticornis THOMAS !, Proc. Dav. Acad. So., II (1877), 

 p. 125, pi. iv, figs. 1, 2. 



Ground color very uniform luteo-testaceous, the pronotum and femora 

 slightly darker than the tegmina and feebly lustrous. Head distantly 

 and coarsely punctate with blackish brown along the carinae of 

 the face, the front and inferior margins of the genae and across the 

 labrum; prouotum similarly punctate, except upon the dorsum of the 

 metazona (though the puncta follow the posterior margin), the puncta 

 transversely disposed and in the center of the lateral lobes more or less 



