THE CANADIAN ENTOMOLOGIST 



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•concentrically Striate. Wings brown, basal fourth much paler, gray. 

 Segment 8 of abdomen unarmed, without the usual comb-like 

 fringe on posterior margin. 



Physothrips xanthocerus, sp. nov. 

 (Fig. 3, a and b.) 

 Female {macroplerous) . — Length about 1.1mm. Colour dark 

 blackish brown, nearly black, with antennal segments 3-8, all 

 tarsi, and distal half of all tibia?, light lemon yellow; fore wings 

 brown, pale gray in basal fourth. 



Head about three-fourths as long as greatest width, sides 

 arounded and converging to base; occiput with several anastomosing 



Fij. 3. — Physolhrips xanihocrus. n. sp., female, holotype; b, antenna. 



lines; interocellar bristles less than one-fourth as long as head, 

 situated well within the ocellar triangle; a pair of smaller bristles 

 in front of, and a second pair behind posterior ocelli; postocular 

 bristles small, three pairs in profile at posterior angles of eyes. 

 Eyes about 0.6 as long as head and slightly narrower than their 

 inter\'al. Ocelli equidistant, subequal in size, posterior pair 

 opposite middle of eyes. Antennae about three and one-fourth 

 times as long as head, form of segments shown in figure, unusual 



