314 



Fig. I., Chloroneura (n. g.) malefica Walsh ; fig. II., the same with 

 expanded wings. Fig. III., head of Chloroneura maligna Walsh. 

 (These two insects supposed to be the causes of the well-known " Fire- 

 blight" on the apple and pear.) Fig. IV., Typhlocyba, § B. Fig. V., 

 Empoasca (n. g.) Fig. VI., Erythroneura Fitch; fig. VII., its ovi- 

 positor, m profile. 



f ^y ^/ Fi^ II 



N. B. The lines annexed to the figures show the length unmagnified. 



All the insects hereinafter referred to belong to the extensive 

 genus Typhlocyba of Germar, which comprised, in 1838, no less than 

 thirty British species. Dr. Fitch reckons up fifty-eight species found 

 in the State of New York ; my private cabinet contains over forty-five 

 Illinois species belonging to this genus, and it is not at all improbable 

 that there are as many as two hundred and fifty in the whole United 

 States. 



Dr. Fitch remarks that " the number and arrangement of the veins 

 in their wing-covers and wings present such diff'erences as would 

 probably have induced authors to separate them into distinct genera, 

 had they been of larger size and better known." He then proposes 

 the following subdivision into genera, or subgenera, and observes that 

 each of them " admits of further division," and that, " as a matter of 

 convenience, a separation is required." 



'■'• Typhlocyba. Wing-covers bordered on the hind part of their inner 

 side by a submarginal vein, running parallel with the exterior edge, 

 and commonly having a closed discoidal cell also. [See fig. IV.] 



'•'■Empoa. Wing-covers not bordered, their outer apical cell three- 

 sided, or with a single acute angle at its forward [i. e. basal] end. 

 [See fig. v.] 



''■Erythroneura. Wing-covers not bordered ; their outer apical cell 



