32 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. xx. 



9. RHABDOTETTIX, new genus. 



(fldf3$o? t a stick; re'rric, grasshopper.) 

 Paraidemona (pars) BRUNNER, Kev. Syst. Orth. (1893), p. 145. 



Body more or less pilose, of much the same shape as in Paraidemona r 

 at least in the male; that of the female differs only in being a little 

 shorter. Head not prominent, not wider including the eyes than the 

 broadest part of the pronotum; vertex very feebly arched, scarcely 

 elevated above the level of the prouotum and in the male not above 

 that of the eyes, the fastigium rather rapidly decliveut, narrow (female) 

 or very narrow (male) between the eyes, broadening in front, .sulcate 

 between the eyes in the female, throughout in the male; frontal costa 

 contracted only at the extreme summit, elsewhere equal, broader than 

 the interspace between the eyes but not very broad, slightly sulcate; 

 eyes moderately prominent in the male, much larger than (male) or about 

 as large as (female) the whole intraocular portion of the genae; antennae 

 rather slender, fully half as long as the body (male) or simply longer 

 than head and pronotuin together (female). Pronoturn very slightly 

 (male) or distinctly (female) enlarging from in front backward, the front 

 margin not in the least flaring to receive the head, the hind margin 

 biconvexly truncate, being slightly emarginate in the middle with A T ery 

 broadly convex halves, more distinct in the female than in the male : 

 disk nearly plane, but very broadly convex transversely, with well 

 rounded angles in passing into the vertical lateral lobes, and a very 

 feeble, blunt, median cariua; prozona about twice as long as the ineta- 

 zona, sparsely punctate especially in the female, the metazona densely 

 punctate, the transverse sulci of the former much as in Sinaloa, but 

 slightly more distant. Prosternal spine short, erect, conical; rnes:>- 

 sterual lobes separated by an interval which is distinctly longer than 

 broad in the male, subquadrate in the female, the metasternal lobes 

 contiguous or subcoutiguous (male) or moderately distant (female). 

 Tegmina elliptical, lateral, about as long as the prozona. Fore and 

 middle femora distinctly tumid in the male; hind femora short and 

 moderately stout, the hind tibiae with 8-11, generally 9, spines in the 

 outer series. Extremity of the male abdomen subclavate, upturned, 

 the margin of the subgenital plate with no basal ampliation, straight 

 or very feebly sinuate, the apex rounded and not angulate, protruding 

 beyond the tip of the supraanal plate by less than half the length of 

 the latter; furcula .consisting of a pair of exceptionally broad lobes 

 scarcely protruding beyond the margin of the last dorsal segment; 

 cerci compressed, moderately broad, subequal and arcuate or subarcuate. 



R. palmeri maybe taken as the type. 



The genus is known only from Texas and Mexico, where three species 

 occur. 



ANALYTICAL KEY TO THE SPECIES OF RHA15DOTETTIX. 



A 1 . Sides of the disk of the pronotuin with a narrow light colored stripe, rarely 

 indistinguishable from the rest of the disk, followed, on the upper portion of the 

 lateral lobes, by a broad dark stripe; cerci of male not narrowed before the middle. 



