1912] Hood — Neic Genus and Species of North American Thysanoptera 117 



reticulate; segments 1 and 2 concolorous with head; 3-7 dark blackish brown, pedi- 

 cels yellowish; segments 3-6 subglobose, with abruptly narrow pedicels, that of 

 segment 3 very long; 7 lanceolate, pedicellate, without trace of suture; sense cones 

 long, slender, scarcely distinguishable from the spines, of which at least a dorsal 

 pair on segments 3 and 4 are widened in apical half. 



Prothorax about .7 as long as head and, inclusive of coxre, about twice as wide as 

 long; dorsal surface subreticulate; coxte only slightly projecting, without spine; 

 all bristles rather short, dilated at apex, only one pair on anterior margin; the pair 

 at the posterior angles arises from the apex of a more or less evident tubercle. Ptero- 

 thorax nearly 1.4 times as wide as prothorax, sides subparallel; anterior angles 

 shoulder-like, broadly rounded. Wings of both pairs uniform brownish; fore pair 

 without double fringe on posterior margin near apex. Legs not long, reticulate, 

 sparsely and inconspicuously spinose; fore tarsi armed with short, acute tooth 

 standing at right angles to the tarsus. 



Abdomen narrowing slightly to segment 8, th(?nce tapering roundly to tube; sides 

 reticulate, the lines of reticulation cuspidate posteriorly. Tube about 1.1 times as 

 long as head and 2.5 times as broad at base as at apex, sides perfectly straight. 

 Marginal abdominal bristles on segments 2-8 short, dilated, curved; segment 9 

 with upper pair capitate or blunt, two thirds as long as tube; lower pairs pointed, 

 about equal to tube in length; terminal bristles about half as long as tube. 



Measurements: Length 1.34 mm.; head, length .192 mm., width .164 mm.; 

 prothorax, length .131 mm., width .271 mm.; pterothorax width .372 mm.; abdo- 

 men, width, .389 mm.; tube, length .210 mm., width at base .086 mm., at apex 

 .034 mm. Antennal segments: 1, 51/^-; 2, 54/^-; 3, 59/^-; 4, oO/-/-; 5, 51/^-; 6, oQp-; 

 7, SOfJ-; total length of antenna .39 mm.; width at segment, 1.039 mm. 



Described from three females, all macropterous, taken by Mr. 

 Charles A. Hart in sweepings, as follows: Grand Tower, Illinois, 

 June 30 and July 10, 1909; Pulaski, Illinois, June 28, 1909. 



Type locality: Grand Tower, Illinois. 



This is doubtless the long- winged form of some species which 

 spends the greater part of the year in seclusion at the base of 

 grasses, under bark, or in turf. It may easily be known by the 

 long heavy tube, — which is fully half as wide at its base as the 

 greatest width of the head, — the peculiar vertex, the seven-seg- 

 mented antennae, the strongly projecting eyes, and the dorsal retic- 

 ulation. The general appearance of the upper part of the head 

 is much like that of Helioihrips hcemorrhoidalis Bouche. 



EXPLANATION OF PLATES. 



Plate 8. 



Fig. a. Ileliothrips phaseoli sp. nov., female. — Right fore wing, x 131. 

 Fig. b. Heliothrips phaseoli Right antenna, x 361. 



