156 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



Genus GASTROTHRIPS iiov. 



ip, the abdomen; Opffi, a wood worm.) 



Head little, if any, longer than wide, rounded in front, vertex evenly 

 declivous; cheeks rounded, with a few short spines, which are sometimes 

 stout and raised upon barely visible tubercles. Eyes small or moderate, 

 subquadrangular, their caudad and mediad margins forming a more or 

 less evident right angle; interval between eyes much more than their own 

 dorsal width. Ocelli of posterior pair widely separated, nearly contiguous 

 to inner margins of eyes. Antennse eight-segmented; intermediate seg- 

 ments produced beneath in a subtriangular process; last segment slender, 

 subpedicellate. Mouth cone broad, nearly attaining posterior margin of 

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

 labrum. Pronotum shorter than head, trapezoidal, twice as broad across 

 posterior angles (inclusive of coxae) as median dorsal length; posterior and 

 anterior margins concentric. Legs moderate; fore tarsi sometimes armed. 

 Wings, when present, slender, not closely fringed, without double subapical 

 fringe on posterior margin. Abdomen moderate or heavy; tube short to 

 medium, more or less abruptly constricted at apex. 



Type: Gastrcthrips ruficanda, new species. 



As above defined, this genus will prove a moderately large 

 one, comprising species which for the most part live under 

 bark principally, it seems, in the southern States. In ad- 

 dition to the two species herein described as new, two or three 

 others are known to me from uniques. All resemble the spe- 

 cies of Cryptothrips in no slight degree, especially in the form 

 and structure of the mouth cone, antennae, and eyes. They 

 constitute, however, a distinct type of radically different fades, 

 recognized at once by the shorter head and the abruptly con- 

 stricted tube. 



Gastrothrips ruficauda, new species. (PI. VIII, figs. 6, 7.) 



Female (forma brachyptera}. Length about 1.4 mm. General color 

 dark blackish brown or black, thorax slightly paler; antennal segments 

 1 and 2 blackish brown, the latter paler apically, where it is concolorous 

 with pedicel of 3, the remainder of antenna almost jet black, even in balsam 

 mounts; apical half of all femora and middle portion of tore tibia? pale 

 yellowish, sometimes nearly white, the remainder of legs dark blackish 

 brown, tarsi paler; tube abruptly bright brown-red, with apex black. 



Head slightly wider than long, rounded in front, broadest midway be- 

 tween eyes and base, vertex evenly declivous; lateral and dorsal surfaces 

 without sculpture, set with a few short, rather stout spines; postocular 

 bristles alone prominent, sometimes half as long as head, pointed; post- 

 ocellar bristles minute. Eyes small, not protruding, subquadrangular, 

 their caudad and mediad margins forming a more or less evident right angle, 



