204 GENUS ARENIVAGA (bLATTIDAe) 



Th(^ (Icxtro-ventral concealed genital plate in males of this 

 species is very distinctive. The species would, however, appear 

 to be nearest in relationship to rehni. Comparetl with females of 

 rehni, those of the present species before us are distinguished 

 only l)y the interocular space being slightly but distinctly greater, 

 instead of slightly but distinctly narrower than that between 

 the minute ocelli. Closer agreement with holliana is suggested 

 merely by the general appearance of males. 



Type. — cf ; San Lorenzo, Coahuila, Mexico. May. (E. Pal- 

 mer.) [Hebard Collection, Type no. 530.] 



Size medium for the genus, form elongate elliptical. Head with interocular 

 space nearly four-fifths as wide as that between the ocelli.^" Area from 

 between ocelli to labrum depressed with lateral margins narrowly raised, 

 surface concave between the large projecting ocelli. Pronotum broad, the 

 caudal margin broadly convex, the cephalic margin more strongly convex, 

 the angles formed latero-caudad rather sharply rounded; surface covered 

 with minute hairs, cephalic margin more thickly clothed with longer stouter 

 hairs. Tegmina elongate for the genus, subcoriaceous and glossy, apex 

 well rounded, marginal and scapular fields narrow. Costal margin of teg- 

 mina and wings supplied with minute hairs, on the tegmina these become 

 as heavy proximad as on the cephalic margin of the pronotum. Supra-anal 

 plate produced and delicate, bilobate. Cerci small, with joints strongly 

 moniliform meso-distad, tapering to acute apex. Sinistral genital hook 

 very slender, elongate, curving gently inward to near distal extremity, which 

 is shar])ly recurved inward, very slightly enlarged, with acute apex directed 

 proximad. Dextro-dorsal genital plate very small, narrowly transverse, with 

 exposed surface rounded. Dextro-ventral genital plate cleft to near base 

 dextrad, the sinistral portion rotundato-rectangulate and longer than broad, 

 the distal margins smooth, the dextral jjortion a stout chitinous rounded 

 pr()j(>(;tion, which curves sinistrad, with apex touching the dextral margin 

 of the sinistral portion mesad, in such a way that a subcircular open area is 

 en(;lose<l. Subgenital plate bulbous, without styles, hairy toward the asym- 

 metrical and shallowly concavo-emarginate distal margin. Limbs and arma- 

 ment of same as characteristic of the genus. Caudal metatarsus elongate 

 and slender, efjualling combined length of succeeding tarsal joints. Tarsal 

 claws elongate and slender. Pulvilli and arolia absent. 



Allotype. — 9 ; same data as type, with no dat(^ given. [Hel):u'd 

 Collection.] 



.\hii()sl iilontical witli females of rehni, except for the interocular space, 

 which is slightly but distinctly narrower than that between the minute ocelli, 

 and differently shapcil marginal markings of the pronotum cei)ha!atl. Very 



'"The Arizonn males liavc this inlci'spiice (h'cidcdly narrower, only two- 

 fifths as wide as th;it between the ocelli. 



