STATE AGRICULTURAL SOCIETY. 471 



CHESTNUT. LEAVES. 



wings clear and glassy "vvitli a blackish spot on their tips and 

 another on the base which is often prolonged along the middle of 

 the wing and united with the hind spot. Length of the male 

 0.25, female 0.30. This is a common insect on chestnut leaves 

 in the month of July, and I have never met with it upon any 

 other vegetation. 



k 



198. UxADOENED TREE-noPPER, SmiUa inomatu, Say. 



A tree-hopper of the same size and shape with the preceding, 

 but of a light green color fading to light yellow, with a slender 

 black line along the upper edge of its back and a very slight 

 duskiness on the tips of its glassy wings. This is quite common 

 on the chestnut and on oaks fi*om the beginning of July till the 

 last of September. 



The Unarmed tree-hopper No. 64, is also met with on the 

 chestnut in May and July, and at first sight appears identical 

 with the preceding species. It may be distinguished from it by 

 the hind end of its thorax, which is drawn out into a slender, 

 sharp point, and its breast, which is black. 



199. Chestnut GAT-LOUSE, Callipterus Cas/anecE, new species. (ITomoptera. 

 Aphidae.) 



On the under sides of the leaves, puncturing them and sucking 

 their juices in August and September, a small sulphur-yellow 

 plant-louse, with black shanks and feet, its antennae also black 

 except at their bases and as long as the body, its wings pellucid, 

 their first and second oblique veins and the tip of the rib-vein 

 edged with coal-black, and its thiglis straw-yellow. Length 0.09, 

 to the tip of the wings 0.15. 



Tliis insect, in conij^any witli wingless larvse and pupse of the 

 same color, may frecjuently be met with upon tlie under sides uf 

 chestnut leaves. The name " gay-louse," which is of the same 

 import witli tlie generic term Callipterus^ and is the equivalent of 

 the German name zicrlaus wliicli Kocli ai)plirs to tliese plant lice, 

 will be tlu* most aj)proj)riate desii^nation which our language fur- 

 nishes for tliis and the other s])ecies of this genus, several of 

 which have already been noticed in the jiroceding pages, (No. 20, 

 167-171.) Their bright, lively colors, and their long, slender 



