218 W. D. P^UNKHOUSER 



is usually recognized by its green color and its prominent supruhumeral 

 horns. It is one of the most widely distributed of the genera of this sub- 

 family. The species may be separated by the following key: 



a. Brown with transverse bands diceros 



aa. Green or greenish without bands. 



b. Undersurface of body strongly marked with black ' bascdis 



bb. Undersurface of body not strongly marked with black. 



c. Dorsal crest marked with brown or reddish; species small. 



d. Horns long, sharp, much recurved and elevated consians 



dd. Horns short, little elevated, only slightly recurved Palmeri 



cc. Dorsal crest concolorous. 



d. Small, 7-S mm.; very hairy borealis 



dd. Large, 8-10 mm.; hairs if present scattered. 



e. Horns long, sloping upward and recurved; clypeus much pro- 

 longed beyond vertex taurina 



ee. Horns stout, nearly straight; clypeus short bubalus 



4. Ceresa diceros Say (Plate xxiv, 1, 2) 



1824 Membracis diceros Say, Narr. Long's Exp. App., p. 299. 



1835 Smilia diceros Germ., Silb. Rev. 3:237. 



1840 Mem6rads diceros Blanch., Hist. Nat. Ins. 3:181. 



1842 Harris, Treatise, p. 178. 



1843 Ceresa postfasciata A. & S., Hem., p. 540, pi. 10, fig. 3. 

 1846 Ceresa diceros Fairm., Rev. Memb., p. 285, no. 11. 

 1851 Fitch, Cat. Ins. N. Y., p. 50. 



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



1854 Emm., N. Y. Agr. Rept. 5: pi. 3, fig. 16. 



1859 Membracis diceros Say, Compl. Writ. 1 : 199. 



1862 Harris, Treatise, p. 221. 



1862 Ceresa diceros Uhler, Harris' Treatise, p. 221. 



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



1869 Rathvon, Momb. Hist. Lane. Co. Pa., p. 551. 



1872 Uhler, List Hem. Colo, and N. Mex., p. 472. 



1876 Uhler, List Hem. West Miss. River, p. 343. 



1877 Glover, Rept. U. S. Dept. Agr., p. 29, fig. 16. 



1877 Butler, Cist. Ent. 2:215, no. 1. 



1878 Uhler, List Hem. Dak. and Mont., p. 509. 

 1878 Glover, MS. Journ. Hem., pi. 1, figs. 27. 28. 

 1886 Prov., Petite Faune Can. 3:234. 



1888 Comstock, Int. Ent., p. 172. 



1889 Van Duzee, Can. Ent. 21 : 6. 



1890 Van Duzee, Psyche 5:389. 



1890 Smith, Ins. N. J., p. 441. 



1891 Osborn, Iowa Acad. Sci. 12:128. 



1892 Godg., Ins. Life 5:92. 



1894 Godg., Cat. Memb. N. A., p. 400. 



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

 1900 Lugger, Minn. Agr. E.xp. Sta. Bui. 69:110. 

 1903 Buckt., Mon. Memb., p. 169, pi. 35, figs. 2-3a. 

 1903 Ceresa vitidalis Buckt., Mon. Memb., p. 172, pi. 36, figs. 3-3b. 

 1905 Ceresa diceros Van Duzee, N. Y. St. Mus. Bui. 97:552. 



1908 Van Duzee, Stud. N. A. Memb., p. 35, pi. 1, fig. 12. 



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



