INSECUTOR INSCITI^ MENSTRUUS 7 



eral plates ; sternites fringed posteriorly, with long, slender 

 spines, the lateral ones of which are sometimes fused at base 

 in groups of 3 to 6. 



Measurements of holotype : Length 1.30 mm. ; head, length 

 0.132 mm., width 0.174 mm.; prothorax, length 0.156 mm., 

 width 0.246 mm. ; pterothorax, width 0.288 mm. ; fore wing, 

 length 0.840 mm., width at base 0.096 mm., at middle 0.051 

 mm. ; abdomen, width 0.348 mm. 



Antennal segments 1 2 3 4 5 6 7 8 9 



Length (n) 24 38 83 54 35 34 23 17 20 



Width (n) 33 28 28 26 20 17 12 11 8 



Total length of antenna, 0.328 mm. 



Described from 11 females taken on "Indian Geranium," at 

 Tempe, Arizona, April 25, 1913, by Mr. H. M. Russell. 



Easily distinguished by the armature of the posterior mar- 

 gins of the abdominal tergites. 



Heterothrips minor, new species. (PI. I, fig. 6.) 



female ( macro pterous). — Length about 0.84 mm. Color 

 dark blackish brown, with tibiae, tarsi, apices of fore femora, 

 and antennal segments 1, 3, and 4 paler; fore wings dark 

 brownish gray except for a white transverse band just beyond 

 scale. 



Head about 1.4 times as wide as median dorsal length, 

 slightly shorter than prothorax, widest about midway between 

 eyes and base, cheeks slightly rounded ; surface with a few 

 minute spines, impressed and transversely rugose in front of 

 anterior ocellus, smooth between ocelli, and with about five 

 anastomozing striae on occiput ; frontal costa with deep 

 U-shaped emargination ; ocellar area not at all delimited by 

 chitinous lines. Eyes setose, about 0.6 as long as head, about 

 as wide as their dorsal interval, not bounded behind by a 

 chitinous line. Ocelli of posterior pair twice the diameter 

 of anterior ocellus, a little less than half as wide as their 

 interval. Antennae about 2.4 times as long as head; segment 



3 stout, subconical, about two and one-fourth times as long 

 as greatest width, with deep incision at basal sixth and third ; 



4 about 0.6 as wide as long, roundly narrowed to base ; 5-8 



