240 NEW NORTH AMERICAN DECTICINAE 



Rehnia sinaloae new species. (Pl. VIII, figs. 6 and S; pi. IX, figs. 5 and 7.) 



This remarkable insect forms a section of the genus Rehnia 

 showing a pronounced tendency toward Neoharrettia Rehn, and 

 may require a subgenus' for its reception to properly express 

 its isolated position. It is a Rehnia, however, as it possesses four 

 distal spurs on the flexor surface of the caudal tibiae, has the 

 pronotal form of the Rehnia type and the male genitalia, although 

 strikingly modified, with the same general features found in the 

 other species of the genus. 



From the other species of Rehnia now known the present form 

 at once can be distinguished by the very short tegmina of the 

 male, which are composed of little more than the complex dorsal 

 stridulating field and a narrow lateral field, the whole no longer 

 than the head and pronotum together; while the elongate and 

 forcipate male cerci are equally distinctive. In the female sex 

 the form of the subgenital plate will be found distinctive, while 

 the tegmina proportionately are as abbre\date as in the male sex. 

 The ovipositor is shorter than in the other species, while the 

 process of the seventh sternite is less developed than in R. spinosa 

 a,nd,cerbenis. 



Type. — cf; Venvidio, Sinaloa, Mexico. August 14, 1918. 

 (J. A. Kusche.) [Hebard Collection, Type no. 534.] 



Size slightly smaller than R. victoriae; form similar to that of the other spe- 

 cies but with reduced tegmina and wings: surface smooth, of head, thorax 

 and limbs weakly shining. 



Head short in cephalo-caudal length, moderately bullate, width across 

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

 aspect the lateral margins of head regularly diverge ventrad; face subdeplanate: 

 fastigium very small, narrow, strongly compressed, finely sulcate dorsad, in 

 profile rounded at apex and not in contact with the fastigium of the front: 

 occiput strongly arcuate in length and breadth. Eyes prominent, broad 

 ovate in basal outline, the juxta-antennal portion of the margin slightly 

 flattened. Antennae about two and one-fourth times as long as body, slender. 



Pronotum subsellate, not elevated cephalad, in caudal fourth appreciably 

 ascending dorso-caudad, all margins of pronotum cingulate: greatest caudal 

 width of disk of pronotum contained one and one-third times in greatest length 

 of same; cephalic margin of disk weakly but distinctly concave, caudal margin 

 of disk subtruncate mesad, broadly arcuate laterad. Lateral lobes with 

 greatest depth contained one and one-half times in greatest dorsal length 

 of same: cephalic margin of lateral lobes moderately oblique arcuato-tnm- 

 cate; ventro-cephalic angle rounded obtuse-angulate; ventral margin arcuate 

 subtruncate, slightly oblique; ventro-caudal angle rounded obtu.se; caudal 



