244 W. D. FUNKHOUSER I 



1869 Thelia bimaculata 8tk\, Hem. Fab. 2:115. 



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



1877 Glover, Rept. U. S. Dept. Agr., p. 29, fig. 17. 



1878 Glover, MS. Journ. Horn., pi. 1, fig. 24. 

 1886 Prov., Petite Faune Can. 3:242, pi. 5, fig. 9. 

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



1890 Van Duzee, Psyche 5 : 39 1 . 



1891 Osborn, Iowa Acad. Sci. 1-:128. 



1892 Godg., Ins. Life 5:93. 



1894 Godg., Cat. Menib. X. A., p. 411. 



1903 Buckt., Mon. Memb., p. 218, no. 0. 



1908 Van Duzee, Stud. N. A. Memb., p. 57. 



1909 Smith, Ins. N. J., p. 91. 



1911 Matausch, Journ. N. Y. Ent. Soc. 19:195. 



1912 Matausch, Bui. Amer. Mus. Nat. Hist. 31:333, pi. 29, fig. 7. 



1913 Funkh., Horn. Wing Veins, figs. 1, 2, 3, 24, 25, 36. 

 1913 Rept. Ent. Soc. Ont. 36:135. 



1915 Funkh., Ann. Ent. Soc. Amer. 8:140-151, figs. 1-10. 



1915 Metcalf, Hom. No. Car., p. 8. 



1916 Van Duzee, Check List Hem., p. 59, no. 1615. 



Extremely abundant thruout basin. It inhabits only the locust and 

 only one species of this tree {Rohinia pscudacacia) , but occurs in great 

 numbers. The entire life history is passed on the one host (Funkhouser, 

 1915 b). The species is easily recognized by the large size, the porrect 

 pronotal horn, and the l^rilliant yellow markings of the male. 



The eggs are laid on the roots, and at the base of the stem just below 

 the surface of the forest litter. Mating begins the first week in Jul}' and 

 continues thru the season. Egg-laying likewise is continued during the 

 entire summer and autumn. From three to six eggs are laid in a slit. 

 The first nymphs appear late in May and require about a month to reach 

 maturity. The time required for development, however, is most irregular 

 and is influenced largely by climatic and seasonal conditions. The males 

 disappear in the fall much sooner than do the females, but both sexes 

 may be found after the first snows. The species is largely attended l\v 

 ants. 



Thelia bimaculata may be found in all parts of the basin wh(n-e Rohinia 

 pseudacacia occurs. 



Technical description. — Female: Gray with indistinct darker irregular markings; porrect 

 cylindrical horn slightly flattened and somewhat darker in color at tip; tegmina hyaline, 

 apices fuscous, almost reaching extremity of dorsal process. 



Head, including eyes, twice as broad as long, grayish yellow mottled with ferruginous 

 and brown; margins of lorae strongly sinuate; eyes dark brown; ocelli white, nearer to each 

 other than to the eyes and situated on a line drawn thru centers of eyes; clypeus pilose; beak 

 extending to posterior coxae; head very sparingly punctate and sparsely pilose. 



