PSYCHE 



VOL. XIX. AUGUST, 1912. No. 4 



A NEW GENUS AND THREE NEW SPECIES OF NORTH 

 AMERICAN THYSANOPTERA. 



By J. Douglas Hood, 

 Bureau of Biological Survey, U. S. Departmejit of Agriculture. 



Heliothrips phaseoli sp. no v. (Plate 8, Figs, a, b, and c.) 



Female. — Length about 1.1 mm. General color yellowish brown; head and 

 thorax paler than abdomen, the former nearly yellow (vertex almost white by re- 

 flected light) and shaded with brown at base; legs brown, with the femora and tibi« 

 paler at extremities; tarsi pale; abdomen slightly paler at tip. 



Head about 1-4 times as wide as long and about equal in length to prothorax; 

 cheeks slightly arcuate; dorsal surface distinctly but not conspicuously reticulate, 

 roughened between the lines of reticulation; frontal costa nearly or quite as wide 

 as first antennal segment; vertex subcarinate in front of ocelli. Eyes twice as long 

 as their distance from posterior margin of head, not protruding, setose. Ocelli 

 approximate, opposite center of eyes. Antennse about 2.4 times as long as head; 

 segment 1 subspherical ; 2 broadest, a little longer than wide; 3 and 4 urn -shaped, 

 the former about 2.2 times as long as wide; 5 clavate; 6 and 7 together of same 

 form as .'5, but inverted; 8 very long and slender. Segments 1, 2, 'i, 7, and 8 brown; 

 intermediate segments nearly white, brownish in apical half. Maxillary palpi two 

 segmented. 



Prothorax nearly twice as wide as long, about equal in length to head, and with 

 similar reticulation; a band of about eight short bristles across middle, and a 

 few scattered ones near posterior and- anterior margins. Pterothorax somewhat 

 broader than prothorax, the membrane and mesoscutum yellow, other plates brown. 

 Wings long, surpassing the abdomen; fore wing thirteen times as long as width 

 at middle, and with two veins nearly or quite attaining tip; principal vein at base 

 with four spines, of which the distal is longer, nearly black, and situated at the fork; 

 anterior vein with one spine at base and two near apex, the last nearly black; pos- 

 terior vein with five or six equidistant spines at middle, of which three are usually 

 black; hind wings brownish, with darker median vein. 



Abdomen broadly ovate, pointed at tip; notum of segments 1-8 closely striate 

 laterally, the striae transverse toward middle of segment and longitudinal at sides. 

 Segment 10 without longitudinal dorsal suture, though sometimes irregularly weak- 

 ened toward tip. 



Measurements: Length 1.10 mm.; head, length .108 mm., width .175 mm.; 

 prothorax, length .108 mm., wadth .210 mm.; mesothorax, width .280 mm.; abdo- 

 men, width .336 mm. Antennal segments : 1,21/^-; 2,36/^-; 3, 50,«; 4,42/-'.; 5,38/^-; 

 6, 27m; 7, 14//; 8, 20/^; total, .25 mm. 



