184 P»yche [December 



a Carynota in 1851 (Cat. Horn. N. Y., 48. 651) and Walker in the 

 same year (List Horn. B. M., 144. 2) also placed it in this genus. 

 Van Duzee mentioned it as Ophiderma arquata in 1890 (Psyche V: 

 389) in which genus it remained until Goding made it the type of his 

 new genus Vanduzea in 1894 (Catalogue of Described Membracidse 

 of North America, 440. 136). The species has been often men- 

 tioned in literature and Matausch has published an excellent figure 

 of the last instar in his paper on the last nymphal stages of Mem- 

 bracidse in 1912 (Bull. Amer. Mus. Nat. Hist. XXXI: PL 32, 

 Fig. 16). Van Duzee gives its principal range as from Ohio 

 southward (Bull. Buffalo Soc. Nat. Sci. IX: 103) but it has also 

 been recorded from most parts of the United States east of the 

 Rocky Mountains. 



General Description. 



Vanduzea arquata is one of the smaller of the species of Mem- 

 bracidse represented in the local fauna. The sexes are quite 

 distinct in size and color, the females being light chocolate-brown 

 with yellowish white fascia and nearlj^ six millimeters long while 

 the males are very dark brown with less extended fascia and much 

 smaller than the females. The dorsum in the males, also, is 

 inclined to be depressed behind the middle, while that of the 

 females is nearly straight in this region. The species may be at 

 once recognized by the straight, transverse base of the terminal 

 cell of the fore-wing, the transversely rounded dorsum, the 

 pubescent pronotum with the characteristic markings (Figs. 9 

 and 10) and the pvmctured costal area of the fore-wing. 



Habits. 



Two species of Membracidse, Thelia bimaculata Fab., and 

 Vanduzea arquata Say. are commonly found upon the locust in 

 central New York, and of these the latter is more abundant, 

 although less conspicuous, than the former. Locally they may 

 be found in surprising numbers throughout the entire summer, 

 being so numerous, in fact, that it is not unusual to take several 

 hundred individuals from one host plant in a single hour's collect- 

 ing. The adults and nymphs are found crowded in the notches of 

 the twigs, usually in the irregular crevices left by the old bud- 

 scales of the preceding year, and may be easily located by the 



