June, I9I5-] HoOD AND WiLLIAMS : NeW ThYSANOPTERA. 133 



capitate form of the bristles, the presence of the anterior marginal 

 pair on the prothorax, the small warts on the tube, and the six pairs 

 of black abdominal spots. 



GNOPHOTHRIPS new genus. 

 iyvoipos, darkness; dpl^/, a wood worm.) 



Head much longer than wide and much longer than prothorax ; vertex 

 rounded, slightly produced, bearing the anterior ocellus at its extremity ; 

 cheeks smooth, arcuate to eyes and base of head. Eyes small (in the single 

 known species about one-fifth the length of head), not at all protruding, in- 

 conspicuous. Ocelli anterior in position. Antennae eight-segmented, the last 

 two segments closely, but not compactly, joined. Mouth cone nearly attaining 

 mesosternum ; labium rounded, scarcely surpassed by labrum. Prothorax 

 much shorter than head, bristles short. Fore tarsi unarmed in both sexes. 

 Wings reduced in the only known species. Abdominal segments short, those 

 near base about four times as wide as long. Tube about half as long as head. 



Type. — Giiophofhrips megaccps Hood and Williams. 



It must be said that this genus is a rather weakly defined one, 

 approaching LiotJirips very closely in nearly all details of structure, 

 such as the produced vertex, the more or less united character of 

 segments 7 and 8 of the antennse, and the unarmed fore tarsi of both 

 sexes. Its separation is based principally on the reduced wings, — 

 wing dimorphism is unknown in LiotJirips, — the transverse abdom- 

 inal segments, the short prothoracic bristles, and the small, non- 

 protruding eyes. 



Gnophothrips megaceps new species. (Plate X., figs, i and 2.) 



Female (brachypterous). — Length about 1.7 mm. Color black, with 

 thorax slightly lighter ; tarsi brown ; antennae beyond segment 2 ochraceous 

 yellow, darkened with brown apically. 



Head about 1.3 times as long as greatest width, broadest at middle, sides 

 converging roundly to eyes and base of head ; vertex rounded, slightly pro- 

 duced ; cheeks nearly smooth, with a few minute bristles; postocular bristles 

 short and blunt. Eyes about one-fifth as long as head and not at all protrud- 

 ing, slightly narrower than their interval. Ocelli forming an equilateral 

 triangle ; anterior ocellus overhanging, posterior ocelli slightly in front of 

 middle of eyes. Antennas about 1.3 times as long as head, form and structure 

 well shown in Figure 2, Plate — ; sense cones small, formula: 3, o— i ; 4, 1-2; 

 5, 1-1+^; 6, 1-1+^; 7 with I on dorsum near apex; segments i and 2 nearly 

 concolorous with head, 2 paler at midle of apex ; 3-6 ochraceous yellow, 5 

 slightly infuscate apically, 6 brownish in apical half; 7 yellow in basal third, 

 remainder of antenna brown. 



