272 NEW NORTH AMERICAN MELANOPLI (ORTHOPTERA) 



In general appearance the present insect shows very close 

 similarity to A . hispidus (Bruner) ; to these species A . rainier- 

 ensis Caudell shows also close resemblance, though having small, 

 elongate-ovate tegmina. 



From both of the above species somesi differs in the male geni- 

 talia having relatively large furcula, which are longer than their 

 basal width, the lateral portions of the supra-anal plate not thick- 

 ened and raised in a separate small but distinct flange opposite 

 the cerci 26 and the cerci elongate and heavy proximad, very slen- 

 der and scarcely tapering in the distal two-fifths. In hispidus 

 the cerci are approximately as long, but taper gradually to the 

 slightly heavier apex; in rainier 'ensis the cerci are much as in 

 hispidus, but proportionately shorter and frequently slightly 

 heavier. 



Females of rainierensis are readily distinguished by the pres- 

 ence of tegmina; those of somesi and hispidus show but little of 

 differential value, this sex of somesi being, however, slightly 

 heavier, with pronotal proportions slightly broader. 



The three species compared above are much closer to each 

 other than to the genotype, montanus, that species being readily 

 distinguished by the more evenly convex pronotum, different 

 coloration and color pattern and form of the male cerci, which 

 show distinct deflection distad. Tegmina are present in mon- 

 tanus, of much the same type as found in rainierensis. 



In linear order we would place the species as follows; mon- 

 tanus, somesi, hispidus and rainierensis. 



Type. — cf; Upper Little St. Mary Valley, above Lake Ellen 

 Wilson, Glacier National Park, Montana. Elevation, 6700 feet. 

 August 9, 1918. (M. P. Somes.) [Hebard Collection, Type no. 

 500.] 



Size medium for genus, form rather stout and heavily built, surface well sup- 

 plied with minute but moderately elongate pilose hairs. Head much as in 

 hispidus, full ; vertex moderately tumid, interspace between eyes one and one- 

 quarter times as broad as first antennal joint, fastigium moderately depressed, 

 frontal costa. with margins feebly and broadly cingulate to below ocellus, 

 nearly subequal in width throughout. Antennae shorter than caudal femora. 27 



26 This feature is found to exhibit a certain amount of individual variation 

 in some examples of A. montanus (Bruner), hispidus and rainierensis. 



27 We would note that in the series at hand of both hispidus and rainierensis, 

 individuals from lower elevations have the antennae decidedly longer than 

 those from higher levels. 



