INSKCUTOR INSCITI^ MENSTRUUS 15 



to shelter, still deeper into the buds. If this insect should 

 attack the young cane in large numbers in the spring, it seems 

 quite possible that considerable damage would result. We 

 have in this insect what I should call a potential economic 

 species. It seems, next to Frankliniella tritici, to be the most 

 abundant thrips in this part of Arizona." 



Chirothrips vestis, new species. (PI. I, fig. 9.) 



Female ( macro pterous). — Length about 1.1 mm. Color yel- 

 low ocher, with head and antennal segments 4—8 blackish 

 brown, and thorax, outer surface of legs, and sides and tip of 

 abdomen lightly shaded with gray. 



Head about 0.8fi as long as wide and a little more than half 

 as long as prothorax, frontal costa wide, concave, occiput 

 smooth, eyes bordered with a chitinous line behind ; cheeks 

 nearly straight and parallel, about one-fifth as long as head, 

 outline almost continuous with that of eyes ; front slightly 

 produced, its sides parallel and less than half as long as cheeks ; 

 about seventeen pairs of short, stout spines near base of 

 antennas, in addition to a similar interocellar pair ; three addi- 

 tional pairs of minute bristles at posterior margin of eyes on 

 dorsal surface. Eyes about half as long as head. Ocelli of 

 posterior pair widely separated, much larger than anterior 

 ocellus. Antennae about 1.8 times as long as head; segments 

 1 and 2 clear lemon yellow ; 3 yellow, clouded with gray, more 

 deeply toward apex ; 4—8 blackish brown ; segment 1 on ventral 

 surface about 0.6 as long as wide; segment 2 inverted foot- 

 shaped, its axis about 0.6 as long as width along line parallel 

 to apical margin ; 3 pyriform, with brief pedicel, four-fifths 

 as wide as long ; 4 and 5 suboval, about as long as wide ; 6 

 about 1.7 times as long as wide, broadest at basal third, roundly 

 tapering to apex; 7 and 8 about equal in length, each about 

 one-third as long as 6, 8 about twice as long as wide. 



Prothorax about 1.9 times as long as head and only about 

 1.2 times as wide as long ; pronotum without sculpture, closely 

 and prominently set with short, stout spines along median 

 fourth and in a pair of midlateral patches, the two usual bris- 

 tles at posterior angles only slightly longer. Pterothorax 



