MORGAN HEBARD 247 



Chorisoneura texensis Saussure and Zehntner (Plate X, figures 7 and 8.) 



1893. Chorisoneura texensis Saussure and Zehntner, Biol. Cent.-Anier., Orth., i, 



p. 80. [cf : New Mexico;"' Texas.] 

 1904. Chorisoneura plocea Rehn. Ent. News, xv, p. 184. [ 9 , Coast of South Caro- 

 lina.] 



Confusion In the description of the tegminal venation of plocea, 

 and the ambiguity in the description of the costal veins of the 

 wing in texensis, accounts for the above synonymy. The venation 

 in tegmina and wings in the type of plocea agrees fully with the 

 description of texensis and with Texan material of the species now, 

 before us."'^ 



The obtuse-angulation of the base of the appendicular held of 

 the wings distinguishes this insect, from all the other species of the 

 genus we have been able to examine. 



Characters of Male. — (Esperan za Ranch, Brownsville, Texas.) Size medium small 

 form moderately broad for the genus. Head immaculate in coloration; width 

 about equal to length; interocular space slightly narrower than the broad space 

 between the antennal sockets. Pronotum subelliptical, with caudal margin (usu- 

 ally) almost transverse, very weakly convex. Tegmina with margins distad con- 

 vergent and moderately convex to apex; discoidal sectors (10 to 13 in series) rather 

 strongly oblique, the great majority springing from the median vein. Wings with 

 numerous (10 to 13 in scries) costal veins, of which the more proximal (6 to 8 in 

 series) are heavily clavate distad; discoidal and median vein connected by (6 to 

 8 in series) transverse veinlets; ulnar vein unbranched; axillary vein with two 

 branches, these run to near the caudal angle of the appendicular held; appendicular 

 field with base forming an angle of slightly more than 90°, width of field slightly 

 greater than length. Sixth dorsal abdominal segment with a rounded meso-cephalic 

 area, thickly supplied with agglutinated hairs, which lie flat and are directed 

 caudad.''" Supra-anal plate strongly transverse, caudal margin weakly con\ex. 

 Cerci elongate fusiform, depressed (usually composed of nine joints). Subgenital 

 plate small, with distal margin briefly concave to two slender, adjacent, mesal 

 scutes (styles) which, converging, become contiguous distad; between the bases ot 

 these is a small, slender, chitinous projection, closely pressed between the much 

 longer scutes, which project dorsad to the apex of the supra-anal plate. Armament 

 of limbs, puK illi and arolia, as gi\en in generic description. 



'" This New Mexican record suggests an error of some kind; ihe species has not been 

 found, and, in our opinion, does not occur, in truly desert regions, nor has it e\er been 

 taken in the mountainous regions of the southwestern United States. 



'"* The synonymy of plocea with texensis has been established by Rehn and Hebard, 

 Proc. Acad. Nat. Sci. Phila., 1916, p. 120, (1916). 



'" This area is incon.spicuous and might easily be overlooked in the present species. 



MEM. .\M. ENT. SOC, 2. 



