48 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



scarcely arcuate; ajjical margin not defined from the external apical 

 lobe. 



Apex with the outer lobe well developed, the latter three-fourths 

 as wide as the dorsal plate, rather broadly rounded and slightly semi- 

 membranous at tip; internal lobe small and membranous; both lobes 

 set with long flying seta\ 



Appendage short and more or less conical, sometimes slightly 

 visible from above, directed backwards and slightly inwards. Fossa 

 moderate and fringed with moderately long hairs. 



Basal prominences moderate. 



Superior pudendal memhrane longitudinally rugulose and reach- 

 ing to the side of the internal lobe of the apex. 



Ventrolateral surface rather short, not strongly convex, but more or 

 less gradually sloping to the apex, not usually transversely impressed 

 but sometimes more or less so just behind the narrow transverse basal 

 convexity; sul)marginal groove well defined l)eneath the explanate 

 external border of the dorsal plate, not markedly bending inwards 

 at apex to fossa; surfaces finely and sparsely punctate, setose, setae 

 very short, at apex short and flying. Internal margins of the val- 

 vulse contiguous for a very short distance both at base and apex; 

 genital fissure broadly fusiform, with basal half closed by the inferior 

 pudendal membrane. 



Remarl's on female genital characters. — Forma glabra has the 

 genital segment quadrate in outline and more thickly setose at apex, 

 Avith the basal convexities more strongly developed. Forma intersti- 

 tialis has the dorsal plate more strongly and coarsely punctate. 



Habited. — Forma typica. — Texas (Alpine, June, elevation 1,400- 

 6,000 feet, IT. F. AVickham; Uvalde, elevation 930 feet; Granjino, 

 May; Marfa, elevation 4,600-4,800 feet, July, Wickham) ; New Mex- 

 ico (Albuquerque, March, Wickham; Santa Fe Canyon, August, 

 elevation. 7,000 feet, Y. H. Snow); Arizona (Fort Grant; Oak 

 Creek Canyon, Snow) ; Colorado (La Junta, Garland, Pleasant Val- 

 ley, on the Arkansas Eiver, Snow; "Wickham's List). 



Forma glabra. — Texas; New ]\Iexico (Highrolls, Ma}' and August; 

 Cloudcrofi, June, Warren Knaus) ; Colorado (Garland, June; 

 Salida) ; Arizona (Chiricahua Mountains, Ma}^; Sulphur Springs 

 A^alley, June). 



Forma interstitialis. — Texas (El Paso, July, elevation 3,700^3,800 

 feet, Wickham) ; New Mexico (Deming, July. Hubbard and Schwarz; 

 Luna; Albuquerque, March); Arizona (San Simon, July; Sulphur 

 Spring Valley, May; Tucson, April; Chiricahua Mountains, May, 

 Hubbard and Schwarz). 



Number of specimens studied, 100. 



Type destroyed. 



