JAMES A. G. REHN AND MORGAN HEBARD 229 



Valley Expedition for the north and south plateau-like range 

 separating ]\Ieado\v Valley from the Escalante Desert. Crest- 

 line is the point at which the Los Angeles and Salt Lake Railroad 

 crosses this divide, the elevation being approximately 6000 feet. 

 The arborescent vegetation is an open, park-like stand of Utah 

 Juniper (Juniperus utahensis) and occasional pinyon; the ground 

 cover is almost entirely sage. The weather was chilly and un- 

 settled when these specimens were collected. The field notes 

 made at the time the specimens of A. segnis: were taken are so 

 full they are worthy of ciuotation in their entirety. 



"The two decticids were taken in juniper. Both were located 

 on the night of September third by their stridulations, and one was 

 taken with the aid of a flash lamp. This individual was twenty- 

 five feet up in the top needle clusters. Its note was much like 

 that of Scudderia, but it was more difficult to locate. When 

 found the insect started slowly to crawl downward and it could 

 not be seized until it had gone down the trunk over a foot. The 

 other individual was located in a juniper about ten feet high 

 and the next morning was found resting in one of the topmost 

 bunches of needles, where its coloration made it almost indis- 

 tinguishable from its surroundings. When seized it uttered a 

 sharp tswick-tsivick-tsunck over and over again. The song at 

 night could be heard by intent listening at as far away as two 

 hundred feet. Two others were heard. They began to sing 

 as dusk fell and were at their loudest early in the evening, ceasing 

 as the night l:)ecame cold." 



Aglaothorax armiger'^ new species. (PL VIII, figs. 2 and 4; pi. IX, figs. 



2 and 3. 



Separable from ovatus and segnis by the much smoother and 

 less rugulose pronotal disk and the very weak lateral production 

 of the lateral carinae of the pronotal disk. From ovatus it also 

 differs in having the pronotal disk more elongate in proportion 

 to the width, and in the lateral lobes of the pronotum being more 

 shallow and more elongate caudad. From segnis it also differs 

 in having the median carina of the pronotal disk subobsolete, 

 the mesozona of same less inflated, the tooth on the inter-cercal 

 plates pre-apical instead of apical and in the male cei-ci lx>ing 

 shorter and broader. 



^ Arinigcr — bearing a shield, in allusion to the pronotal disk. 



TRANS. AM. ENT. SOC, XLVI. 



