OF WASHINGTON, VOLUME XIV, 1912. 157 



on ventral surface of head angulate posteriorly and slightly prolonged; 

 interval between eyes about twice their own dorsal width. Ocelli small; 

 anterior ocellus scarcely overhanging; posterior ocelli much more distant 

 from each other than from the anterior ocellus, nearly contiguous to eyes 

 and slightly posterior to their anterior third. Antenna? about twice as 

 long as head, formed much as in Cryptothrips; segment 1 trapezoidal, 

 fully as broad as long; 2 about two-thirds as wide as long; 3 clavate, twice 

 as long as greatest width, thrice as wide as pedicel at base, sides almost 

 straight; 4 distinctly shorter and stouter, two-thirds as wide as long; 5 

 slightly longer than 4, of similar form and equal width; 6 equal and similar 

 to 5 but slightly narrower; 7 distinctly shorter, 0.7 as broad as 4, broadest 

 near base, truncate at apex, pedicellate; S slender, only slightly .shorter 

 than 7, broadest at basal two-fifths, ventral surface with about six comb- 

 like bristles. Mouth cone broad, nearly attaining posterior margin of 

 prosternum; labium semicircularly rounded at apex, subequal in length to 

 labrum. 



Prothorax about 0.7 as long as head and (inclusive of coxae) about 2.3 

 times as wide as long; pronotum non-sculptured, without median thicken- 

 ing; anterior and posterior margins concentric; all usual bristles present, 

 pointed, the anterior marginals greatly reduced and scarcely visible, the 

 two pairs at the posterior angles much the longest, about four times us 

 long as midlaterals and the pair at the anterior angles. Pterothorax re- 

 duced, about as long as prothorax, sides nearly parallel. Legs short, rather 

 stout; fore tarsi unarmed. 



Abdomen stout, nearly 1.5 times as wide as prothorax, broadest at about 

 segment 5, thence rounded evenly to base of tube. Tube about 0.8 as 

 long as broad, twice as long as basal width, very abruptly constricted at 

 apex, where it is half as wide as at base, intermediate portion slightly 

 tapering. Lateral bristles on segments 6-9 fully as long as tube, nearly 

 black; terminal bristles two-thirds as long as tube. 



Measurements: Length 1.36 mm.; head, length 0.184 mm., width 0.208 

 mm.; prothorax, length 0.136 mm., width (inclusive of coxa?) 0.316 mm.; 

 pterothorax, width 0.336 mm.; abdomen, width 0.452 mm.; tube, length 

 0.152 mm., width at base 0.079 mm., at apex 0.036 mm. Antennal seg- 

 ments: 1, 33 M; 2, 54 M ; 3, 60 M ; 4, 50 M ; 5, 54 M ; 6, 54 M ; 7, 41 M ; 8, 38 M ; 

 total length of antenna, 0.384 mm., width at segment 4, 0.033 mm. 



Described from 3 females taken from branches of grape, 

 'sycamore, and overcup oak ((??/r;r^>'/(vv/AAValt.), respectively, 

 at Grand Tower and Pulaski, Illinois, by C. A. Hart and 

 L. M. Smith, in October and July. 



The broad head, unarmed fore tarsi, and the short, red tube 

 should serve to distinguish this species from the following. 

 Gastrothrips texanus, new species. (Pl.'iv, fig. 7.) 



Female (forma macroptera). Length about 1.4 mm. General color 

 dark blackish brown, nearly black posteriorly; antennal segments 1 and 2 



