234 NEW NORTH AMERICAN DECTICINAE 



as tightly as the bundles of leaves would permit, the sharp 'dag- 

 gers' forming a protecting barrier. On one sultry afternoon the 

 males were giving a short 'tzick' at very long intervals. The 

 males protestingly and vigorously stridulated when disturlicd, not 

 only their characteristic 'tzick' but a 'bzzzz' also. Apparently 

 they are very local, as on one occasion thirty Joshuas were thor- 

 oughly examined without result, while on two adjacent Joshuas, 

 one of which was very small, ten specimens were taken." 



Rehnia cerberus" new species. (PI. VIII figs. .') and 7; pi. IX, figs. 4 and 6.) 

 Allied to R. spinosa Caudell, from southern Texas, but differ- 

 ing in the somewhat smaller size, in the great amount of ])lackish 

 coloration on the caudal margin of the pronotum, in the generally 

 pronounced brownish color of the abdomen, in the shorter and 

 more recurved male cerci, the basal tooth of which is much less 

 basal in position than in spinosa, in the shorter and Iwoader 

 stridulating field of the male tegmina and in the smaller, less 

 recurved protuberance on the seventh sternite in the female. 

 With spinosa the present species forms a group well separated 

 from the othei- components of the genus. 



Type. — cf ; Marathon, Brewster County, Texas. Elevation, 

 3900 to 4160 feet. August 26, 1912. (Rehn and Hebard.) 

 [Hebard Collection, Type no. 535.] 



Size medium; general form and texture as in R. spittofia. 



Head short in lengtli l)ut very deep, moderately l)ullate, width across 

 ventral portion of genae one and one-fifth times that across eyes, in cephalic 

 aspect the lateral margins of the head gently diverge ventrad: face subde- 

 planate: fastigium strongly compressed, sul)lamellate, briefly sulcate proximad 

 on dorsal surface, in profile arcuate dorsad, apex obtuse-angulate, not in 

 contact with the subobsolete fastigium of the front. Eyes of medium size, 

 quite ])r(Mninent, appreciably proje(!ting, semi-globose, short ovate in basal 

 outline, .\nteimae very slightly more than twice the length of the body, 

 slender. 



Pronotum sellate, on (lie disk elevatcul (•e])hMlad and caudad; ceplialic 

 elevation occu()ying somewh-.t less than one-sixth of pronotal length, regu- 

 larly but not strongly ascHJnding cephalad, the elevation extending lat-eracl 

 along the cephalic margin of tiie pronotum, l)ecoming obsolete on the lateral 

 lobes; caudal elevation a fourth of the pronotal length, decidedly elevated, 

 sharply differentiated ceph;Uad and arcuate bullate in outline, extending 

 transversely between points dorsad of tegminal insertions; profile of pronotum 

 between cephalic and caudal elevations deplanate and straight longitudinally, 



^ CcrhcruH, the three-headed dog at the gates of Tartarus. 



