Biology of the jNIembracidae of the Cayuga Lake Basin 267 



This is perhaps the most brilliantly' marked of all the local species 

 of ]\Iembracidae. The grovmd color of the high, flattened pronotum is 

 brown — chocolate in the female and black-brown in the male — with 

 a broad diagonal slash of bright nile green extending from the cephalic 

 dorsal apex to the middle of the lateral margin. 



Technical description. — Pronotum high and foliaceous, extending forward over the head; 

 brown with broad diagonal stripe of green or yello\vish followed by a parallel translucent 

 band and a white spot; males much smaller and darker than females. 



Head triangular, sculptured, yellow with scattered brown punctures and hairs; eyes brown; 

 oceUi pearly, margins raised, nearer to each other than to the eyes; clypeus continuing inferior 

 line of face, apex slightly produced. 



Pronotum coarsely punctured, punctures farther apart in pale parts; wide green band 

 extending from anterior dorsal angle of crest to lateral margin of pronotum, this band fading 

 to yellowish in dried insects; wide translucent band from behind middle of dorsum to lateral 

 base of crest; white spot at posterior base of crest; humeral angles hardly produced, short, 

 rounded; posterior process short, pointed, not reaching tips of tegmina. 



Tegmina hyahne, bases punctate with brown, apices brown. Undersurface of Dody 

 brownish yellow. Legs flavous. 



Length, female 9 mm., male 7-S mm.; width, female 3 mm., male 2.5-3 mm. 



The genus Cyrtolobus Goding 



The genus Cyrtolobus is very large and widely distributed. The 

 species are in great confusion and extremely hard to delimit. The specific 

 characters generally used have been based on the shape and color of the 

 pronotmii, both of which are very variable indeed; so that a long series of 

 specuiiens show gradations thru a number of species as at present 

 recognized. The chief source of confusion arises in the fact that many 

 of the species inhabit the same host (chiefly oak) and the nj-mphs are 

 gregarious. 



The genus as a whole may be distinguished by the compressed dorsum 

 and the thin, semitransparent spot below the dorsal ridge. The colois 

 are usually dull browns with many irregular markings. 



Only a few species have been reared. It has been possible, however, 

 to recognize ten apparently distinct species, which may be separated as 

 follows: 



a. Dorsum regularly rounded from head, without anterior notch ovatus 



aa. Dorsum with anterior depression before elevation, 

 b. Crest arising before humeral angles. 



c. Color uniform dark brown fidiginosus 



cc. Color pale yellow-red with brown oblique line muticus 



bb. Crest arising behind humeral angles. 



c. Large — at least 9 mm. in length tuberosus 



