315 



tour-sided, or with two right angles at its forward [i. e. basal] end." 

 (See fig. VI.) N. Y. Reports Inj. Ins., Vol ii., §104. 



This division, as will be noticed, is founded exclusively on the neu- 

 ration of the elytra. On examining the Aviogs as well, it will be 

 found that two distinct types of neuration exist in each of the last 

 two genera, the terminal cells being bordered in some and not bor- 

 dered in others, and the median vein being in some unconnected with 

 the submedian by any cross-vein, and in others being distinctly so con- 

 nected. (Comp. figs. V. and VI.) These differences appear to be of 

 higher generic value than that which separates Empoa from Erythro- 

 neiira, and will necessitate the establishment of two new genera. 

 The following synoptical table will exhibit the arrangement at a 

 glance. 



Ocelli equidistant 

 from the eyes and 

 from each other, plac- 

 ed near the anterior 

 margin of the head, 

 wliich margin is 

 rounded, not angulat- -^ 

 ed; elytra indistinctly ' 

 veined, with four dis- 

 tinct terminal cells ; 

 posterior tibiae with 

 a double row of 

 spines. 



Elytra bordered by 

 a vein on 



terminal margin 



)rriered by c 

 the inner < 

 argin. ( 



a diseoidal cell, . Ttjphlocyha, § A. 



sB. 



Elytra not 

 bordered. 



Outer api- 

 cal cell of 

 elytra trian- 

 gular. 



I 



no diseoidal ceU, Typhlocyba, 

 'Torm'l cells 

 of w'gs bor- 

 dered, . . . ^Empoasca, n. g. 

 \ Term'l cells I 

 1 of wings not 

 [ bordered, . .'Empoa. 

 ( Term'l cells 

 Outer api- | of w'gs bor- 

 eal cell of ' dered, . . . Chloroneura,n.g. 

 \ elytra quad- \ Term'l cells ; 

 i rangular. , of wings nut 

 V^ V bordered, . . Eryihroneura. 



Of these six divisions, the five last all comprise species of about an 

 eighth of an inch in length, and of a uniform pale greenish or yellow- 

 ish color, with scarcely any markings. These I propose to describe, 

 as they are liable to be confounded with the two foes of the apple and 

 pear. Where specific characters are almost entirely wanting, descrip- 

 tions of species must necessarily be brief. 



Typhlocyba. § B. (Fig. IV.) 



Typhlocyha aurea (n. sp.) Golden-yellow, beneath pale, front of 

 head forming the quadrant of a circle. Eyes, ovipositor, and tips of 

 tarsi, brown. Elytra golden-yellow to the cross-veins, paler on the 

 costal half; two middle cross-veins not dislocated, as they are in 

 Chloroneura and Erythroneura ; tips hyaline, extreme tips cloudy ; 

 wings hyaline. Length to tip of wings, a little over one-eighth of an 

 inch. Occurs at Rock Island, 111. 



TypTilocyha pallidula (n. sp.) Differs from the preceding as fol- 

 lows : Body whitish above, yellowish beneath ; ovipositor yellowish, 

 elytra whitish-subhyaline, sometimes with a faint yellow vitta on the 

 costal and interior margins. Occurs in Southern Illinois. 



Typhlocyba hinotata (n. sp.) Differs from aurea as follows : Body 



