MORGAN HEBARD 24 I 



weakly creased mesad, suggesting bilobation. Dextro-ventral concealed genital 

 plate a large, convex, corneous plate, with distal margin briefly flattened, convex in 

 outline. Subgenital plate produced, asymmetrical, C}uite dee])ly arcuato-emarginate 

 latero-mesad, sinistral production rectangulate and sharply rounded, dextral pro- 

 duction acute and sharj)!}- rounded, projecting slightly more distad. Distal sur- 

 face of plate armed with minute, scattered, short, sharp spines, directed cephalad. 

 Proximad the surface of the plate, near the sinistral margin, forms a convex ridge, 

 produced cephalad over the preceding segment with margin rounded, this area cov- 

 ered thickly with minute, short, sharp spines, directed cephalad; from beneath this 

 projection a similar development is continued on the preceding segment, bearing a 

 distal fringe of slightly stouter spines. Femora wholly unarmed, clothed, par- 

 ticularly along the ventral margins, with very fine, long hairs. 



As the female was hitherto unknown, we here describe a topo- 

 typic female before us. 



9 ; Las Cruces, Donna Ana County, New Mexico. (T. D. A. 

 Cockerel!.) [Museum of Comparative Zoology.] 



Description oj Female. — \'ery unlike male, apterous, size larger, form suborlicular 

 Eyes even more decidedly reduced than in females of the genus Aretiivaga, not 

 extending over the antennal sockets. Head with clypeal swelling extending from 

 the very narrow, flattened, distal margin of clypeus to a line drawn across the face 

 just above the antennal bases. Dorsal surface finely punctulate, heavily clothed 

 with hairs, these longest on the margins, particularly latero-caudad (in greatest 

 length 1.7 mm.). Pronotum weakly transverse, cephalic margin arcuate, nearly 

 forming a semicircle, caudal margin very weakly convex produced mesad, with 

 sides broadly but weakly concave. Supra-anal plate strongly transverse, trapezi- 

 form, with distal angles rounded. Subgenital plate rather large, weakly produced 

 mesad, with distal margin convex. Cephalic femora with ventro-cephalic margin 

 bearing a few stout, very short, rather closely placed teeth proximad, succeeded in 

 distal two-thirds by a weakly arcuate row of very widely spaced, stout, ver\- short, 

 knob-like spines; other ventral femoral margins frequently supplied with a very 

 few scattered, even smaller but similar, blunt, knob-like spines; all femora very- 

 hairy. 



Measurements (hi millimeters) 



-7, Length of Length of Width of Length of Width of 



body pronotum pronotum tegmen tegmen 



Alamogordo, New Mex- 

 ico (8)10.1-11.8 3.2-3.6 4.5-4.0 13. 7-15. 2 5.1-5.8 



Sentinel, Arizona (5) 9.3-10.8 3.1-3.6 4-5.1 13. 2-14. 7 5-5.9 



Yuma, Arizona (2) 9-9.5 2.9-3.1 4.1-4.4 11. 8-1 2. 2 4.7-4.9 



Brown, California 12.3 3.7 4.8 14.9 5.7 



Cottonwood, California . (3) 9. 2-1 1.4 3-31 4.1-4.2 12. 2-14. 8 4.6-5.8 



Palm Springs, California 10.7 3.6 4.7 14. i 5.8 



MEM. AM. ENT. SOC, 2. 



