Biology of the Membracidae of the Cayuga Lake Basin 275 



Eggs laid during September hatch about the middle of May and the 

 insects reach maturity the last of June. Males are much less numerous 

 than females thruout the season. Mating has been observed thru August 

 and September, and the nymphal periods have been found to average, 

 respectively, ten, six, five, ten, and fourteen days. 



A very fine stand of hickory containing a few oaks near the top of South 

 Hill has proved a good station for the species, but the best collecting ground 

 in the basin has been Station B, particularly the small grove just east of 

 the old street-car right of way. Here the nymphs appear about June 1 

 and the adults are plentiful by the middle of July. The nymphal skins 

 are very noticeable on the undersides of the leaves, and the exuviae are 

 very perfect. A large numl^er of such exuviae have been collected on 

 July 11, which date marks the height of the last molting season. Mating 

 occurs a few days after the adults reach maturity, and oviposition begins 

 during the same week. Some of the eggs hatch in the same season, making 

 two broods a year for certain years. This depends, however, on climatic 

 conditions. 



Technical description. — Small robust species, with low pronotum and prominent markings; 

 varies greatly in color and somewhat in size; females larger and lighter than males, but with 

 constant markings; transverse pronotal band prominent, pale bordered with deep brown; 

 dorsal compression deep and translucent; posterior process short, blunt, not reaching tips 

 of tegmina; tegmina hyaline, with bases and tips slightly brown. 



Head small, subtriangular, pale yellow punctured with brown; base feebly sinuate; inferior 

 margin of face sinuate, clypeus extending slightly below line; eyes large, gray-browTi; ocelh 

 small, j'ellowish, somewhat nearer to each other than to the eyes; clypeus hairy. 



Pronotum closely and roughly punctate, median compressed spot round, transparent; 

 dorsal crest low, arising above humeral angles and gradually extending with only a faint 

 sinus before posterior process; posterior process short, blunt, tectiform, reaching to bases 

 of apical cells of tegmina. 



Tegmina hyaline, veins prominent, bases and apices smoky hyaline. Legs and under- 

 surface of body uniform flavous. 



Length 5..5-6.5 nmi.; width 2.4-2.6 mm. 



47. Cyrtolobus intermedius Emmons (Plate xxviii, 15) 



1854 Cyrtosia intermedia Emm., N. Y. Agr. Rept. 5: pi. 13, fig. 16. 

 1894 Cyrtalohus iniermedius Godg., Cat. Memb. N. A., p. 433. 

 1908 Van Duzee, Stud. N. A. Memb., p. 90. 



1916 Van Duzee, Check List Hem., p. 61, no. 1683 



Not common, and hard to delimit. The color is chestnut brown and if 

 constant should be a good superficial character. The insect is of medium 

 size, but the limited amount of material available for study makes it 



