138 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



broader than prothorax; membrane yellowish, plates brown. Wings long, 

 very slender, overreaching abdomen; fore wings about eighteen times as 

 long as width at middle, of normal venation; costal margin with about 18 

 bristles; principal vein with four short colorless bristles, of which two are 

 near base and two near fork; anterior vein with one bristle at base and two 

 near apex, all slender, the last longer and brownish; posterior vein w r ith four 

 or five nearly equidistant bristles, these usually rather short, colorless; 

 fore wings white, with a dark brown or black band occupying the second 

 and third fourths, margined with darker brown in apical eighth, extreme 

 base lightly washed with brown; hind wings brownish, with darker median 

 vein. 



Abdomen moderately slender, ovate, pointed at tip; notum subreti- 

 culate, more faintly at middle; segment 10 with longitudinal dorsal suture. 



Measurements of holotype: Length 1.16 mm.; head, length 0.133 mm., 

 width 0.161 mm.; prothorax, length 0.109mm., width 0.212 mm.; meso- 

 thorax, width 0.248 mm.; metathorax, width 0.224 mm.; abdomen, width 

 0.300 mm. Antennal segments: 1, 18 n; 2, 37 M; 3, 45 n; 4, 40 n; 5, 38 /u; 

 6, 33 M; 7, 14 M; 8, 33 n; total length of antenna, 0.26 mm., width at segment 

 4, 0.021 mm. 



Male. Length about 0.8 mm. Sternum of abdominal segments 3-7 each 

 with a nearly circular pale area. Segment 9 with two pairs of dorsal spines, 

 the basal pair much shorter and stouter than the apical. 



Described from 25 females and 4 males, from Anna, Clay 

 City, Grand Tower, Havana, Hillery, and Makanda, Illi- 

 nois, all taken by Mr. Hart in sweepings from grass and weeds, 

 during June, July, August, and September. 



In the specimens at hand the coloration of the body, wings, 

 and antennae is remarkably constant, and serves to distin- 

 guish the species from the allied H. fasciapennis (sic!) Hinds. 

 In the latter species, furthermore, the pale areas on the ven- 

 tral surface of the male abdomen are fully five times as wide 

 as long, instead of transversely oval or nearly circular. 



Thrips pallicornis, new species. (PI. v, figs. 5, 6.) 



Female. Length about 1.2 mm. Color dark blackish brown or black, 

 with bright crimson hypodermal pigmentation, more brilliant in ptero- 

 fchorax and second antennal segment; segments 3-7 pale lemon-yellow, 

 slightly shaded with gray; wings of fore pair white in basal fourth, remain- 

 der blackish brown. 



Head 1.4 times as wide as median dorsal length, somewhat longer than 

 prothorax, as broad across eyes as midway between eyes and base; cheeks 

 arcuate to eyes and base of head; vertex rather depressed, frontal costa 

 notched at about 60; four pairs of very distinct bristles behind eyes, and 

 another similar pair between anterior and posterior ocelli; a small pair 

 lateral to and in front of the anterior ocellus. Eyes rather less than half 



