796 Van Duzee: Catalogue of Hemiptera [2869%- 



Pateh, Me. Agr. Exp. Sta., Bui., p. 228, 1912. 



Crawford, U. S. Natl. Mus., Bui. 85, p. 89, 1914 (figures). 



helvetina Meyer-Dur, Mitth. Schw. Ent. Ges., iii, pp. 388, 391, 1871. 

 nigrifrons Crawford, Pomona Jl. Ent., ii, pp. 230, 351, 1910 (figures). 

 fulvida Crawford, Pomona Jl. Ent., ii, pp. 231, 358, 1910 (figures). 

 \\svmilis Crawford, Pomona Jl. Ent., ii, pp. 231, 359, 1910 (as var. of /uZvida). 

 aurantiaca Crawford, Pomona Jl. Ent., ii, pp. 231, 360, 1910 (figures). 



Crawford, Pomona Jl. Ent., iii, pp. 426, 428, 628, 1911. 



\\frontalis Crawford, Pomona Jl. Ent., ii, p. 232, 1910 (as var. of aurantiaca). 

 Host : Salix. 



Localities: 111., Colo., Utah, N. Hex., Nev., Calif., Ore., Wash. 

 (Europe.) 



2869*4. Trioza forcipula Patch 

 Patch, Me. Agr. Exp. Sta., Bui. 202, p. 227, 1912. 

 Host: Ulmus. 

 Localities: Ont., N. Y., Colo. 



2869%. Trioza pyrifoliae Forbes 

 Forbes, 14th Kept. HI. St. Ent., p. 98, 1885. 

 Mally, Proc. la. Acad. Sci., ii, p. 154, 1895 (mention). 



Host : Pyrus. 



Locality: HI. 



2870. Trioza nigrilla Crawf. 



Crawford, Pomona Jl. Ent., iii, p. 503, 1911 (n.n. for nigra Crawf.). 

 \\salici8 Mally, Proc. la. Acad. Sci., ii, p. 161, 1895. 



Crawford, Pomona Jl. Ent., iii, pp. 426, 428, 432, 1911 (figures). 

 Aulmann, Psyllid. Cat., p. 53, 1913 (listed). 

 Crawford, U. S. Natl. Mus., Bui. 85, p. 91, 1914 (figures). 

 Van Duzee, Check List Hemip., p. 86, No. 2870, 1916. 

 minuta Crawford, Pomona Jl. Ent., ii, p. 232, 1910. 



Crawford, Pomona Jl. Ent., iii, pp. 425, 427, 432, 1911 (figures). 

 \\assimttis Crawford, Pomona Jl. Ent, ii, p. 233, 1910. 



Crawford, Pomona Jl. Ent., iii, pp. 426, 429, 438, 1911 (figures). 

 \\nigra Crawford, Pomona Jl. Ent., ii, pp. 232, 258, 1910 (figures). 



Crawford, Pomona Jl. Ent., iii, pp. 427, 428, 1911. [minuta Crawf.). 

 ||m*Zw Crawford, Pomona Jl. Ent., iii, pp. 425, 427, 433, 1911 (as var. of 

 flori Crawford, Pomona Jl. Ent., iii, p. 503, 1911 (n.n. for assimilis Crawf.). 

 dubia Patch, Me. Agr. Exp. Sta., Bui. 202, p. 226, 1912. 

 pomonae Aulmann, Ent. Eundsch., xxix, p. 144, 1912 (n.n. for assimilis 

 Aulmann, Psyllid. Cat., p. 51, 1913 (listed). [Crawf.). 



louisianae Aulmann, Ent. Eundsch., xxix, p. 144, 1912 (n.n. for nigra 



Aulmann, Psyllid. Cat., p. 48, 1913 (listed). [Crawf.). 



Host: Salix. 

 Localities : D. C., la., Colo., Nev. Calif. Wash. 



2871. Trioza varians Crawf. 



Crawford, Pomona Jl. Ent., ii, pp. 231, 361, 1910 (figures). 

 Crawford, Pomona Jl. Ent., iii, pp. 425, 427, 628, 1911. 

 Crawford, U. S. Natl. Mus., Bui. 85, p. 91, 1914 (figures). 



Host: Salix. 



Localities: Colo., Utah, Calif., Albta., Brit. Col. 



