NATURAL SCIENCES OF PHILADELPHIA. 149 



CONTRIBUTION TO ORTHOPTEEOLOGY. 

 BY PROF. C. THOMAS. 

 Caloptenus difFerentialis. Thomas. 



Syn. Acridium clifferentiale, Uliler. Trans. 111. St. Ag. Soc, r. 450. 

 (Thos.) CyrtacaJithacris differcntialis. Walk. Cat. Dermap., IV. GIG. 



Although the name of this insect has found its "way into the 

 catalogues, j'et it has received no other description than the very 

 short and imperfect one given by me in the Transactions of the 

 Illinois State Agricultural Society, vol. v. 450. It was designated 

 by the name A. clifferentiale, in a box of Orthoptera kindly 

 named and returned to me by Mr. Uhler. But as he has never 

 described it, and, as I learn from him, does not propose to do so, 

 I give here the first regular description, that it may no longer 

 stand in the catalogues as a mere name. 



Large, robust ; sides of the pronotum squarel}' deflexed, but 

 lateral carinte not distinct ; wings as long as the abdomea ; pul- 

 villi of tarsi remarkably large. General color, olive-brown. 



Female. Occiput convex, not punctured ; a transverse indenta- 

 tion between the angles of the eyes ; vertex broad, expanding in 

 front of the eyes, obtuse, with a broad shallow sulcus above (per- 

 haps not always distinct) ; the frontal carina broad, flat, or very 

 slightly sulcate, sides parallel, a row of slight punctures each 

 side; lateral caringe obtuse, nearly parallel. Antennse passing 

 the thorax slightly, slender, filiform, joints not distinct except 

 near the base. Pronotum has the sides squarely deflexed, the 

 dorsum but slightly convex, that of the posterior lobe being almost 

 flat ; the three transverse incisions distinct, the posterior, which 

 is deeply indented, being postmedial ; the median carina distinct 

 on the posterior lobe, but indistinct on the anterior lobes ; the 

 lateral carinte consist only of the rounded angles formed by the 

 deflexion of the sides. Elytra narrow, about as long as the abdo- 

 men. Wings thin and delicate, with slender nerves, a little shorter 

 than the elytra. Abdomen large and fleshy, somewhat keeled 

 above ; upper and lower appendages very stout, cerci very short. 

 Posterior femora very much swollen near the base and quite thick, 

 tapering rapidly so as to be rather slender near the knee ; a little 

 shorter than the abdomen ; not sharply carinated either above or 

 below. Tibiie much enlarged at the apex ; about as long as the 

 femora ; the apical half furnished with strong spines and hairy. 

 1871.] ^ 



