NATURAL SCIENCES OF PHILADELPHIA. 297 



ward, above this somewhat gibbous and punctured ; lateral carinre 

 very prominent, parallel. Pronotum slightly expanding poste- 

 riorly ; coarsely and reticulately punctured ; median carina dis- 

 tinct, severed by the three transverse incisions. Elytra and wings 

 passing the abdomen. Cerci very short, broad at base, narrowed, 

 and rounded at the tip. Posterior femora much enlarged at the 

 base ; posterior tibiae considerably enlarged at the apex. Pro- 

 sternal spine robust, cylindrical, and nearly straight. Pectus 

 punctured. 



Color. Dark green. Ocelli transparent amber ; eyes brown ; 

 cheeks 3'ellowish with a dark green stripe extending downward 

 from the e^^es. The pronotum has some paler spots on the sides, 

 and sometimes the posterior lobe is tinged with brown. Elytra of 

 a uniform green, semi-transparent toward the apex, and some- 

 times faintly tinged with brown; wings hj'aliue, nerves and 

 nervules dark brown. Posterior femora greenish above and below, 

 raj's of the disk alternately white and green, the white raj^s being 

 the flat interspaces of the chevron ; internal face greenish-3'ellow. 

 Posterior tibise bright vermilion, the under surface being striped 

 with yellow ; spines yellow at base, tipped with black. Yenter 

 and pectus dark green, sometimes varied with dark brown. 



Dimensions. Length 2 to 2.5 in.; elytra l.Y to 2. in. ; posterior 

 femora 1.25 in.; posterior tibife 1.2 in. 



This fine species is very closely allied to A. emarginatum, JJlilev, 

 but differs from it in the following particulars. It has no dorsal 

 stripe ; the elytra are green or greenish instead of brownish-red ; 

 the hind femora do not have the black points on the upper margin 

 of the disk ; it does not have the black dots on the ventral seg- 

 ments ; it is also a larger and more robust species, being one of the 

 largest of this genus found in the United States. I should also 

 state that the cerci of the male, though broad as usual Avith the 

 section of the genus to which this belongs, instead of extending 

 horizontally along the sides, are curved over the apex ; and the 

 sub-anal plate is more than usually elongate, with the apical notch 

 slightl}^ rounded. 



The collection was made chiefly b}' Dr. Yarrow, who informs me 

 that the specimens are mostly from southeast Nevada and south- 

 west Utah. There are some other interesting and new si)ecies in 

 the collection, which will be described in Lieut. Wheeler's report of 

 his explorations. 

 20 



