1913.] NATURAL SCIENCES OF PHILADELPHIA. 309 



San Ignacio, Prov. of Mendoza. Elev. 1,235 meters. March 15 

 .and 22, 1908; April 5, 1908. Four males, two females. 



This very extensive series is of considerable interest, demonstrating 

 as it does that the species is undoubtedly common within its range 

 and that considerable variation in size and sculpture occurs. 



The size extremes of the series are: length of body, d^ 36.7-45.5 

 mm., 9 63.5-82.5; length of head, d' 5.3-6.7, 9 8.5-10; length of 

 rostrum, cf 1.2-1.5, 9 2.5-3.8; length of pronotum, cT 7.2-9.8, 

 9 11.2-13.8; length of tegmen, 9 2.5-2.7; length of cephalic femur, 

 cf 7.1-9, 9 9.3-12.6; length of caudal femur, d' 14.8-18, 9 20.8- 

 27.5. Both extremes of the male sex are from Mendoza, the minimum 

 of the female sex from Blanco Encalada and the maximum from 

 Chacras de Coria. 



The wings of the female vary in the shape of the exposed coriaceous 

 portion, this ranging from broad ovate to elongate elliptical, the size 

 variation of the same being considerable and in no way correlated 

 with the general size. The rostrum exhibits a very appreciable 

 amount of variation in the female, ranging from a length hardly 

 greater than that of the eye to one and one-half times the length of 

 the same. The spiniform tubercles on the cephalic and caudal 

 margins of the pronotum and the spiniform lobes of the mesonotum 

 vary considerably in prominence, the latter also in the degree of their 

 erection, being vertical in some and decidedly inclined caudad in 

 other individuals. The linear rugosities of the body show some 

 variation in prominence which does not appear to be correlated with 

 the development of the tubercles and lobes. 



The only evidence of geographic variation seen in the series is that 

 noticed in the slenderer pronotum of the male and immature female 

 from Alto Pencosa, a locality somewhat removed from those at which 

 the other specimens were taken. 



The color varies from dull brown through gray-browns to hoary 

 white, but how much of the brownish coloration is due to discolora- 

 tion cannot be determined. Some individuals are partially blackish, 

 but this is unquestionably due to discoloration, as the specimens were 

 not eviscerated. 



The following diagnosis shows the features in which the previously 

 undescribed male differs from the female. 



Size small; form more elongate than in the other sex; surface much 

 smoother than in the female. Head with its dorsal length two-thirds 

 that of the pronotum, considerably constricted caudad of the eyes, 

 the whole head considerably elevated cephalo-dorsad ; fastigium 



