136 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



near apex, all short, slender, the last brownish; posterior vein with five or 

 six usually equidistant bristles, all slender and colorless; fore wings nearly 

 white, with apex dark brown and with a light cloud of brown at the fork 

 of the veins; hind wings brownish, with darker median vein. 



Abdomen slender, ovate, pointed at tip; notum subreticulate, more 

 faintly at middle; segment 10 with longitudinal dorsal suture. 



Measurements of holotype: Length 0.972 mm.; head, length 0.114 mm., 

 width 0.142 mm.; prothorax, length 0.102 mm., width 0.178 mm.; meso- 

 thorax, width 0.216 mm.; metathorax, width 0.197mm.; abdomen, width 

 0.246 mm. Antennal segments: 1, 18 /u; 2, 36 n; 3, 41 M; 4, 34 ju; 5, 30 M; 

 6, 24 /*; 7, 12 n; 8, 29 M; total length of antenna, 0.22 mm., width at seg- 

 ment 4, 0.021 mm. 



Described from 5 females, 2 of which were taken in swee/p- 

 ings at Matamoros, Mexico, June 30, 1908, and 3 from Browns- 

 ville, Texas, December 8, 1910, in sweepings from Bermuda 

 grass (Cynodon dactylon (L.) Pers.). All were collected by 

 Mr. Hart. 



Type locality : Matamoros, Mexico. 



The small size of this species and the peculiar coloration 

 of the legs and wings should make it easy of recognition. It 

 belongs in the vicinity oifasciatus,fasciapenn/s, and phaseoli. 



Heliothrips marginipennis, new species. 



Female. Length about 1.1 mm. Color dark blackish brown to nearly 

 black, very slightly, if any, paler anteriorly; legs brown, the femora and 

 tibise yellow at extremities; tarsi yellow; antennal segments 1, 2, and 6-8 

 nearly concolorous with body, intermediate segments brownish yellow and 

 more or less clouded with brown. 



Head about 1.2 times as wide as long, equal in length to prothorax; 

 cheeks nearly straight and parallel; dorsal surface conspicuously reticulate, 

 more particularly so behind an irregular transverse line at basal fourth; 

 frontal costa distinctly narrower than first antennal segment. Eyes very 

 slightly longer than their distance from posterior margin of head, slightly 

 prominent, setose. Ocelli of normal form and postion. Antennae twice as 

 long as head; segment 1 subquadrate; 2 broadest in entire antenna, a little 

 longer than wide; 3 and 4 urn-shaped, the former slightly more than twice 

 as long as wide; 5 almost perfectly egg-shaped, pedicellate; 6 and 7 together 

 of same form as 5, but inverted; 8 very long and slender. Segments 1, 

 2, and 6-8 blackish brown, the first paler; intermediate segments pale 

 brownish yellow, 3 and 4 darkly clouded with brown just beyond middle, 

 5 dark brown in apical two-thirds. Maxillary palpi two-segmented. 



Prothorax about 1.7 times as wide as long, equal in length to head and 

 with similar reticulation; bristles few, short, well distributed, a more promi- 

 nent pair near middle of anterior margin. Pterothorax somewhat broader 

 than prothorax; membrane yellowish, plates brown. Wings long, very slen- 



