Biology of the jNIembractdae of the Cayuga Lake Basin 209 

 The three siibfamihes represented may be distinguished as follows: 



Scutellum distinct / Centrotinae 



Scutellum wanting or concealed by the pronotuni. 



Anterior tibiae foliaceous Membracinae 



Anterior tibiae simple Smiliinae 



SUBFAMILY CENTROTINAE 



Very few species of the subfamily Centrotinae are found outside of the 

 tropical regions, and of these iuit one occurs in the Cayuga Lake Basin. 

 The subfamily may be at once distinguished l)y the fact that the scutellum 

 is present and is usually visible below or behind the pronotum. 



The genus Microcentrus Stal 



The one species found locally, Microcentrus caryae Fitch, is not a typical 

 representative of the subfamily in that it does not show the grotesque 

 development of the pronotum which is characteristic of most of the species 

 of this division of the Membracidae. 



1. Microcentrus caryae Fitch (Plate xxiii, 1, 2) 



1851 Uroxiphus caryae. Fitch, Cat. Ins. N. Y., p. 52. 



1851 Centrotus caryae Walk., List Horn. B. M., p. 1147. 



1856 Uroxiphus caryae Fitch, Rept. Ins. N. Y. 3 ; 450. 



1856 Fitch, Trans. N. Y. Agr. Soc. 16:450. 



1858 Walk., List Horn.. B. INl. Suppl., p. 341. 



1869 Rathvon, Rlonib. Hi.st. Lane. Co. Pa., p. 551. 



1869 Microcentrus caryae Stal. Bid. Memb. Kan., p. 295. 



1890 Smith, Ins. N. J., p. 440. 



1890 Van Duzee, Psyche 5 : 391 . 



1890 Uroxiphus caryae Packard, Ins. Inj. For. and Shade Trees, p. 324. 



1891 Microcentrus caryae Osborn, Iowa Acad. Sci. P:128. 



1892 ' Godg., Ins. Life 5:92. 



1893 Godg., Can. Ent. 25 : 172. 



1894 Godg., Cat. Memb. N. A., p. 474. 

 1896 Uroxiphus caryae Fowler, B. C. A., p. 159. 



1896 Phaulocentrus caryae Fowler, B. C. A., p. 159. 

 1903 Microcentrus caryae Buckt., Mon. Memb., p. 268. 



1908 Van Duzee, Stud. N. A. Memb., p. 117. 



1909 Smith, Ins. N. J., p. 94. 



1910 Matausch, Journ. N. Y. Ent. Soc. 18:170. 

 1915 Funkh., Fitch's Types, p. 50. 



1915 Metcalf, Horn. No. Car., p. 10. 



Fairly common thruout the basin on hickory. Usually on young trees 

 and preferring the higher branches. Since it is the only local repre- 

 sentative of the subfamily Centrotinae, it maybe easily distinguished from 



