IOWA ACADEMY OF SCIENCES. 219 



and thorax respectively; abdominal segments 1-3 and 7-10 

 entirely brown var. c 



6. Head, from dorsal view, semiovate; ocelli subapproximate, 

 conspicuous; spines and bristles, short and few; bristles on 



penultimate segment of abdomen equally long striata, Osb. 



Head, from dorsal view, subrectangular; ocelli remote, 

 inconspicuous; single strong bristle at each posterior angle of 

 prothorax; intermediate bristles on penultimate segment of 

 abdomen, one-half as long as lateral bristles, iasequalis, n. sp. 



7. Size medium; antennae sub-approximate; ocelli inconspicu- 

 ous; prothorax, transverse; bristles at posterior angles of 

 medium length; spines at base of cubitus arranged in two 



groups -- -- --. tabaci, Lind. 



Size large; antennte approximate; ocelli, conspicuous; pro- 

 thorax, subquadrate; bristles at posterior angles of prothorax, 

 long; spines at base of cubitus in single group .. lactucse n. sp. 



8. Antenuce eight-jointed; ocelli approximate; spines and 

 bristles, except those on abdomen, long and slender; bristle at 

 middle of each lateral margin of prothorax, one at each ante- 

 rior and two at each posterior angle pallida, n. sp. 



Thrips {Eutlirips) ti'itici, Fitch. 



[Second report.] Trans. N. Y. State Agr. Soc. for 1855, 

 p. 536; Osborn Can. Ent, Vol. XV, p. 156 (1883). 



Thrips (Euthrips) maidis n. sp. 



Female. Length, 1.83-2.mm. A large species slightly variable in color, 

 brownish-black, but sometimes paler; annulus on antennae, extremities of 

 femora and tibise, lower surface of the latter and sutures of abdomen yellow- 

 ish-white; thorax, especially its sutures, tinged with yellowish-ferruginous; 

 anterior wings dusky white; head pentagonal, front margin produced 

 and rounded in the middle; ocelli distant, antennae subapproximate; 

 spines and bristles. strong, blackish, arranged much as in E. tritici, Fitch; 

 costal spines 25-29; cubital, 19-23; radial, 15-16; anal, 5; internal, 1. 



Head, from dorsal view, pentagonal, scarcely broader than long; its 

 sides parallel; anterior border produced and rounded in the middle; 

 occiput less than one-half the length of the head measured on a median 

 line, plainly striated; genae uniformly full; eyes rather large, coarsely 

 granulated, feebly pilose; orbits yellow, encircled with a few short hairs; 

 ocelli, pale yellow, margined with red crescents, widely separated and 

 arranged in a broad triangle with its lateral angles contiguous to superior 

 orbits; vertex broad, gently coavex between lateral margins; produced 

 cephalad and provided with a transverse row of four short hairs near its 

 anterior margin; the front wide with medial, longitudinal elevation; 

 antennal sockets occupying less than its entire width, making antennse 

 subapproximate, more widely separated than in B. tritici, Fitch; anten- 

 nal joints 3 and 4, occasionally base of 5, white, the rest, black; joint 1 

 globose, more than one-half as long as joint 2; the latter subglobose, 

 somewhat contracted toward base, both joints more robust than those fol- 

 lowing: joints 3-5 elongate, submoniliform, decreasing in size in the 



