THE CANADIAN ENTOMOLOGIST. 143 



as long as eyes.'' Eyes large, very finely faceted, one-third as long as 

 head and about as wide as their interval. Ocelli moderate in size ; 

 anterior ocellus slightly overhanging the abruptly declivous vertex. 

 Antennae slender, about one and three-fourth times as long as head ; 

 segments 3-6 urn-shaped ; 7 and 8 closely united, the latter conical ; 

 sense-cones long and slender, scarcely distinguishable from the antenna! 

 bristles; formula: 3, 1-2; 4, 1-2'^; 5, i-i-^; 6, 1-1+^; 7 with one on 

 dorsum near apex.f Mouth-cone pointed, attaining the mesosternum. 



Prothorax about .6 as long as head and, inclusive of coxae, about 

 twice as wide as long ; usual spines all present, expanded distally. 

 Pterothorax slightly wider than prothorax ; sides nearly straight, slightly 

 converging posteriorly. Wings large, powerful, arcuate, of nearly equal 

 width throughout ; fore wings faintly washed at base with brown, and with 

 the three subbasal spines nearly equal in length and blunt ; apical fringe 

 double for about thirty hairs ; hind wings with a faint vein at costal third 

 reaching about to middle. Fore femora large ; subapical tooth acute and 

 directed slightly anteriorly ; fore tarsi armed with a broad acute tooth, the 

 anterior margin of which is at right angles to the tarsus. 



Abdomen large, broadly rounded at apex ; marginal bristles dilated 

 at tip. Tube about .8 as long as head, tapering evenly from base to apex ; 

 terminal bristles about as long as tube. 



Measurements : Length, 3.2 mm.; head, length .43 mm., width .29 

 mm.; prothorax, length .27 mm., width (inclusive of coxae) .56 mm.; 

 pterothorax, width .65 mm.; abdomen, width .69 mm.; tube, length .34 

 mm., width at base .104 mm., at apex .052 mm. Antennal segments: 

 I, 48//; 2, 73/x; 3, 148/x; 4, 129//; 5, i2o/x; 6, 87//; 7, 75/x; 8, 44/x; 

 total, .73 mm.; width, .042. 



Ma/e. — Shorter and slenderer than female. Length about 2.6 mm. 

 Fore femora larger, stouter, nearly as wide as head ; tarsal tooth larger, 

 slightly curved. Abdomen tapering evenly from about segment 6 to base 

 of tube. 



*iVIoulton, in his Synopsis, Catalogue and Bibliography of North American 

 Thysanoptera, Tech. Sen, 21, Bur. Ent., U. S. Dept. Agr., states in his key on 

 pag^e 19 that H. magiiafemoralis^ nodicoryiis and doanei\\2L\e no postocular spines. 

 This is incorrect as regards the first two species, at least. 



tThe formula for the antennal sense-cones is the same as this in both H, 

 magnafemoralis Hinds and H. albivittatiis Hood. In the original description of 

 the latter species, however, their positions are not so described, the three rudi- 

 mentary cones and the full-developed one on the outer surface of the third seg-- 

 ment having been overlooked in the nearly opaque and otherwise unsatisfactory 

 type specimen. 



