12 Hood — Three New Phlceothripidss (Thysanoptera) . 



clavate, abruptly narrower apically, urn- or vase-shaped ; fi and 7 clavate ; 

 8 sharply conical; sense cones large, moderately slender; formula*: 3, 

 1-2; 4, 1-2+ 1 ; 5, 1-1+ 1 ; 6, 1-1 + 1 ; 7, with one on dorsum near apex; 

 segments 1 and 2 nearly concolorous with body; 3-6 blackish brown, 

 paler at apex and with their basal two-fifths brownish yellow; 6-8 dark 

 blackish brown, 6 with pale pedicel. Mouth cone pointed, nearly attain- 

 ing base of presternum. 



Prothorax three-fourths as long as head, and (including coxae) about 

 1.8 times as wide as long; all usual spines present, dilated apically, the 

 outer pair at the posterior angles longest, twice as long as the coxal and 

 the pair at the anterior angles. Pterothorax slightly wider than long and 

 broader than prothorax; sides nearly straight, slightly converging poster- 

 iorly. Wings long, nearly attaining tube, not narrowed at middle, closely 

 fringed, vein less; subapical fringe on posterior margin of first pair double 

 for about twenty hairs. Legs normal; fore femora not swollen, about half 

 as wide as head; fore tarsi armed with a short tooth. 



Abdomen moderately slender; segment 9 long, about equal to the tube 

 in length, nearly circular as seen from above. Tube about five-sixths as 

 long as head, tapering evenly from base to apex; terminal bristles nearly 

 as long as tube. Marginal abdominal bristles short, capitate, colorless. 



Measurements. — Length, 2.18 mm.; head: length, .30 mm.; width, 

 .25 mm. ; prothorax: length, .23 mm. ; width (including coxa?), .41 mm. ; 

 pterothorax: width, .44mm.; abdomen: width, .45 mm. ; tube: length, 

 .23 mm.; width at hase, .09 mm.; at apex, .045 mm. Antennae: Seg- 

 ment 1, 39m; 2, 57m; 3, 99m; 4, 87m; 5, 81m; 0, 57m; 7, 54m; 8, 33m; 

 total, .507 mm.; width, 41m. 



Described from two macropterous males taken by the writer on poplar 

 near Baldwin, Michigan, August 17, 1908. 



The peculiar coloration of this insect distinguishes it at once from all 

 other species of its genus. Its resemblance, however, both in coloration and 

 structure, to the species of Acanthothrips is striking. The principal 

 characters of that genus, as at present understood, are the presence in 

 both sexes of a subapical tooth on the inner margin of the fore femora 

 and the urn- or vase-like form of the intermediate antenna! segments. 

 But Phloeothrips vittatus, though lacking the femoral tooth of Acantho- 

 thrips, possesses an antenna strikingly similar to that of A. nodicornis 

 Reuter, and in coloration is strongly suggestive of A. albiviltatus m. 



Diceratothrips harti sp. nov. 



Female. — Unknown. 



Male (macropterous). — Length about 2.4 mm. Color uniform black. 

 Surface shining. 



Head subrectangular, 1.7 times as long as wide, truncate in front ; 

 cheeks parallel, excepting for an abrupt, collar-like, basal widening about 

 half as long as eye; dorsal and lateral surfaces faintly transversely striate ; 



* The explanation of the formula used in the description of the antennal sense cones 

 has been given by the author in Ann. Ent. Soc. Am., Vol. 1, No. 4, p. 285, and in Knt . 

 News, Vol. XX, No. 1, p. 29, footnote. 



