160 PROCEEDINGS OF THE ACADEMY OF [Feb., 



in the transverse sulci of the dorsum of the pronotum, although these 

 are strongly pencilled in others. Of the Deming series of sixty-three 

 adults twenty-three are without the blackish pencilling. The Deming 

 series also contains one specimen in a brownish phase, while four others 

 from the same locality approach it more or less closely. The red pre- 

 genicular annulus is present in every adult in the series, in by far the 

 majority of the specimens very strongly indicated. 



There is a considerable amount of individual variation in size, even 

 in specimens from the same immediate locality, but even the largest 

 specimens do not approach the robust, closely allied Mexican H. 

 meridionalis. Several specimens from eastern Colorado (Lamar, 

 Holly and Greeley), examined in connection with the New Mexican 

 material, have the caudal femora very robust. 



JEOLOPLUS Scudder. 

 iEoloplus elegans Scudder. 



This variable species, which at present is only known from localities 

 in the Rio Grande Valley, was taken in numbers at El Paso, July 10, 

 11 and 17. It was found in greatest abundance in bottom land along 

 the river, where it frequented the screw bean or tornillo (Prosopis 

 odorata) and adjacent weedy areas, a series of sixteen males and nine 

 females being taken. Along the edge of the mesa a single pair was 

 taken, while the mesquite-covered sand desert east of the town furnished 

 four males and one female. 



In size there is a considerable amount of variation, so much so in 

 fact that at first glance at a number of males of the species one would 

 imagine they had two forms before them. This variation does not 

 appear to be correlated with any particular environment or with the 

 color phase of the individual. The extremes of the series measure as 

 follows : 



Length of body . 13.2 mm. 20 mm. 19.2 mm. 19. 8 20 mm. 



Length of pronotum, 3.5 " 5 " 5 " 5.2 " 



Length of tegmen, .13 " 17.2 " 16.8 " 17.6 " 

 Length of caudal 



femur, ... 9 " 12 " 11.8 " 13.2 " 



As shown by the above measurements the greatest amount of varia- 

 tion is exhibited by the male, although that noticed in the female is 

 quite perceptible. 



The form of the male cerci is rather variable, in many specimens these 



20 Abdomen compressed. 



