OF WASHINGTON, VOLUME XIV, 1912. 153 



Abdomen little, if any, broader than pterothorax, broadest toward base, 

 thence rounded gradually to base of tube; tubcO.6 as long as head, 2.8 

 times as long as basal width, slightly less than twice as wide at base as 

 at apex, sides straight except for a slight constriction at basal fourth. 

 Lateral bristles of moderate length, knobbed, yellowish, two pointed pairs 

 at apex of segment 9 longer; terminal bristles about equal in length to tube, 

 brown. 



Measurements of holotype: Length 1.68 mm.; head, length; 0.318 mm., 

 width across middle 0.216 mm.; prothorax, length 0.120 mm., width (in- 

 clusive of coxse) 0.307 mm.; mesothorax, width across fore margin 0.338 

 mm.; metathorax, width across hind margin 0.300 mm.; abdomen, width 

 0.348 mm; tube, length 0.192 mm., width atbaseO.069 mm., at apex 0.038 

 mm. Antennal segments: 1, 30 yu; 2, 54 /r, 3, 70 /*; 4, 65 M: 5, 63 n\ 6, 

 54 M; 7, 47 n;8, 39 /*; total length of antenna, 0.42 mm.; width at segment 

 4, 0.031 mm. 



Described from one female taken on elm at Dubois, Illi- 

 nois, July 3, 1909, by Mr. Charles A. Hart. 



The unarmed fore tarsus, if constant, is a remarkable charac- 

 ter, occurring nowhere else in the genus. The sculpture of 

 the head, the pedicellate last segment of the antenna, the 

 slender tube, and the coloration of the legs, all tend to make 

 this a very isolated species. 



Genus CRYPTOTHRIPS Uzel. 

 Cryptothrips longiceps, new species. (PI. VIII, fig. 5.) 



Female (forma brachyptera}. Length about2.2mm. Color dark black- 

 ish brown or black, with pedicel of third antennal segment yellow. 



Head rectangular, about 1.65 times as long as wide, sides perfectly paral- 

 lel; lateral and dorsal surfaces subreticulate toward base, set with several 

 short spines and a longer pair at middle of dorsum; vertex truncate; post- 

 ocular and postocellar bristles long, pointed, subequal; a minute bristle 

 each side of median ocellus and a much longer pair external to these. Eyes 

 moderate in size, not protruding, occupying the anterior angles of the head, 

 and, seen from above, quadrangular in form, their caudad and mediad 

 margins forming nearly a right angle. Ocelli small, about equal in size to 

 facets of eyes; anterior ocellus nearly overhanging; posterior ocelli opposite 

 center of eyes and almost touching their inner margins. Antennse 1.5 

 times as long as head, of normal form and structure (PI. VIII, fig. 5). Mouth 

 cone slightly wider than long, reaching nearly to posterior margin of pro- 

 sternum; tip of labrum just attaining tip of broadly rounded labium. 



Prothorax about two-thirds as long as width of head, and (inclusive of 

 coxae) about 2.5 times as wide as long, without median thickening; usual 

 spines all present, nearly pointed, the two pairs near the posterior angles 

 much the longest, all others moderately short. Pterothorax slightly wider 

 than prothorax; sides subparallel. Legs concolorous with body; fore tar- 

 sus unarmed. 



