232 W. D. FUNKHOUSER 



not been reared in the field owing to the fact that, hke most Ceresas, they 

 require a change of feeding plant for development. In the insectary the 

 nymphal stages averaged as follows: 



First stage 5 days 



Second stage 11 days 



Third stage 9 days 



Fourth stage 10 da^^s 



Fifth stage 12 days 



The various individuals from the same egg cluster do not develop uniformly, 

 some reaching maturity fully a week earlier than others; but adults are 

 common in the field by the middle of June. 

 The species is found in all parts of the basin. 



Technical description. — Resembling C. buhalus in general outline but much smaller and 

 very hairy; metopidium convex; dorsum curved, posterior process only slightly decurved; 

 head impunctate; notch of last ventral segment of female broad and triangular. 



Head broader than long, j'ellowish, roughly sculptured, faintly longitudinally striate, 

 not punctured nor pubescent; eyes prominent, mottled with green and brown, extending 

 beyond adjoining lateral margins of pronotum; ocelli small, reddish, much nearer to each 

 other than to the eyes; clypeus rounded, somewhat protruding, extending for more than 

 half its length below lateral margin of face, tip hirsute. 



Pronotum green, finely, deeply, and densely punctate, very hairy; metopidium convex; 

 median carina faint; suprahumeral horns stout, blunt, nearly straight, projecting almost 

 directly outward; dorsal crest regularly arcuate; lateral semicircular impression nearly 

 obsolete; posterior process curving slightly downward, not extending beyond tip of abdomen 

 and reaching only for a short distance beyond internal angles of tegmina. 



Tegmina entirely hyaline, somewhat wrinkled, bases lightly punctate. Legs and under- 

 surface of body concolorous greenish. 



Length 8 mm.; width 4 mm. 



10. Ceresa basalis Walker (Plate xxv, 10, 11) 



1851 Ceresa basalis Walk., List Hom. B. M., p. 527. 

 1869 Stal, Bid. Menib. Kan., p. 245. 



1877 Butler, Cist. Ent. 2:215, no. 5. 



1893 Ceresa melanogaster Osborn, Bui. Nat. Hist. Lab. Iowa St. Mus. 2:390. 



1894 Ceresa basalis Godg., Cat. Memb. N. A., p. 404. 



1894 Ceresa iurbida Godg., Cat. Memb. N. A., p. 406. 



1895 Gillette and Baker, Hera. Colo., p. 66. 



1903 Stictocephala semi-brunnea Buckt., Mon. Memb., p. 174, pi. 36, fig. 6. 



1905 Ceresaturbiday axi Duzee, N. Y. St. Mus. Bui. 97:552. 



1908 Ceresa basalis Van Duzee, Stud. N. A. Memb., p. 39, pi. 1, fig. 34. 



1908 Van Duzee, Can. Ent. 40: 114. 



1909 Smith, Ins. N. J., p. 90. 



1916 Van Duzee, Check List Hem., p. 58, no. 1580. 



Common. About the size of C. horealis but not so hairy. Easily 

 recognized by the black undersurface of the body, which is a sufficient 



