TWO-MARKED TREE-HOPPER : EGGS AND FOOD-PLANTS. 287 



and portions of tlie adjucent tender wood, the eggs :ire disclosed. They 

 will be found arranged after the same manner as in Cicada, 

 inserted through a single opening, in two parallel series, 

 separated by a small interval. There are in each row from 

 si.xto twelve eggs, partly overlapping one another as in 

 Fig. 83 a. They are elongate, almost cylindrical, of a deli- 

 cate green color, pointed at the more deeply buried end, 

 and rounded and of a yellowish tint at the opposite end : 

 their form is shown at b. They are of so tender a character 

 that it is hardly possible to remove them, or even to un- 

 cover them for examination without injury. Dr. Ilagen 

 has examined them microscopically, and has written me as 



follows of them, under date of October 28th : — 

 Fig. 83. — -. ^ , , , ' . , ^, 



Efrgs of the I tind the eggs to measure, m length ^ 



tWo -spotted 0.42— O.omm, in breadth 0. 1—0. 11mm. 

 theh-oTerkiv The choriou is veri/ finely transversely 

 ping position striated, as at a (Fig. 84). The contents 

 Ttheh- siri^ ' ^^ ^^^^ ^SS ^^'^ iucloscd by a particular 

 as seen in sec- membrane b. Near the tip are three 

 tion. small slits, c, probably the micropyle. 



The chorion is hard and easily broken. The Fig. 84.— Structure of 

 contents of the egg are greenish-yellow ; the cells ted tffe-'hoppen'''''"'^'"*" 

 very fine. 



Food-plants. 



The insect occurs upon many plants in addition to the bitter-sweet. 

 Dr. Fitch {ith Rept. State Cabinet, snp. cit.) includes it among the 

 species affecting the butternut, upon which it may always be found 

 during the latter part of summer, and further states that it is common 

 on numerous plants and trees. According to the American Entomolo- 

 gist, i, p. 248, it punctures tender grape stems and causes them to 

 wilt ; and occurs quite commonly on the red-bud (Cercis Canadensis), 

 and on the hop-tree or tree-trefoil {Ptelea trifoUata) — the latter its 

 favorite home. Mr. Glover {Rejjt. Cominis. Agricul. for 187(J). reports 

 it as puncturing the leaves of the butternut and locust. In Maryland, 

 it is of common occurrence on the locust. Mr. Uhler has informed 

 me that it is known to oviposit in jEupatorium. 



Natural History. 



The history of the insect is still incomplete. The young larvje 

 have been found by Professor Riley on the 10th of May. After 

 passing their first and third molts [second not mentioned] on May 

 18th and June oth, they changed to perfect insects on June 

 12th. The larvae are described as being without the horn-like 



*Aviericaii £>tto}nolo(/ist, Yu, 18S0, p. 254. 



