148 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. x.xvi. 



thorax as long or somewhat longer than the head, with two long spines 

 upon each hind angle and one similar spine upon each anterior angle 

 in many species, but this is wanting in others. Legs usually unarmed, 

 but in a few species with a stout tooth on under side of fore tibia at 

 end. Wings usually fully developed but sometimes reduced. When 

 present thev are moderately broad, have two longitudinal veins which 

 are set with numerous stout spines at regular intervals in those species 

 having a spine at the fore angle of the pronotum. Spines upon 

 abdomen moderately stout; anal spines long and slender. 

 These species are active and can spring. 



SYNOPSIS OF SPECIES. f 



JGeneral color of body yellow 2. 



[General color of body brown 3. 



(Fifth antennal Hcj^ment about five-sixths as long as four occidentalis (p. 152) . 



■^ |Fifth anteinial segment about two-thirds as long as fourth tritici (p. 148) . 



(Antennae about three times as long as head fuscus (p. 154). 



[Antenna! but slightly more than twice as long as head nervosus (p. 155). 



EUTHRIPS TRITICI (Fitch). 



WHEAT THRIPS. 



Plate IV, figs. 36-39. j 



Thrips tritici FiTCM, Count. Gent., VI, Dec. 13, 1855, p. 385. 1 



Thrips tritici Fitch, Rept., II, Nox. Ins. N. Y., 1857, pp. 304-308. 



Tlirips tritici Ashmead, Orange Insects, 1880, p. 72. 



Thrips tritici Osborn, Canad. Entom., XV, 1883, pp. 152, 156. 



Thrips tritici Osborn, Trans. Iowa St. Hort. Soc, XVIII, 1883-1884, pp. 520-521; 



Coll. Bull., 2, Iowa Agrl. College, 1885, pp. 96, 97. 

 TJirips tritici Hubbard, Ins. Affect. Orange, 1885, p. 164, fig. 77, pi. xi, fig. 5. 

 Thrips tritici Forbes, Centralia, III., Sentinel, 1887; Prairie Farmer, June 4, 1887. 

 Thrips tritici Lintner, Cult, and Count. Gent., LII, June 9, 1887, p. 459. 

 Thrips tritici Weed, Prairie Farmer, LIX, 1887, p. 343; Trans. 111. St. Hort. Soc, 



1887, pp. 230-233. 

 Thrips tritici Osborn, Insect Life, I, 1888, p. 141. 

 Tlirips tritici Weed, Popular Gardening, III, 1888, p. 176. 

 TJirips sp. CoMSTOCK, Bull. XI, Cornell Agr. Exp. Sta., 1889, ].. 131. 

 Thrips tritici Riley-Howard, Insect Life, I, 1889, j). 340. 

 ThrijJS tritici Forbes, 16th Rept. St. Entom., 111., 1890, p. ix, pi. v, fig. 4; 17th 



Rept. St. Entom., 111., 1891, pp. xiii, xv. 

 Tlirips tritici Weed, Ins. and Insecticides, 1891, p. 95. 

 Thrips tritici Forbes, Insect Life, V, 1892, pp. 126, 127. 

 Thrips tritici Webster, Bull. 45, Ohio Exp. Sta., 1892, pp. 207, 208. 

 Thrips tritici TowtiSEUD, Canad. Ent., XXIV, 1892, p. 197. 

 Thrips tritici Bruner, Rept. Nebr. St. Bd. Agr., 1893, (1893), p. 457, fig. 96. 

 Thrips tritici Bruner, Nebr. St. Hort. Rept., 1894, (1894), pp. 163, 214, fig. 82. 

 Tkrips tritici Ashmead, Insect Life, VII, 1894, p. 27. 

 Thrips tritici Craw, 4th Biennial Rept. St. Bd. Hort., Calif, for 1893-94, 1894, 



p. 88. 

 Thrips tritici Weed, Ins. and Insecticides, 1895, p. 146. 

 Thrips tritici Uzel, Mon. d. Ord. Thysanoptera, 1895, pp. 220, 278. 

 Thrips tritici Smith, Economic Entom., 1896, p. 102, fig. 73. 



