KEY TO THE SPECIES. 13 



2. Head considerably longer than wide and longer than the prothorax. 

 a. Head less than twice as long as wide. 



b. Fore femora each with a tooth on the inner side near the end. 



(30 Acanthothrips Uzel. 

 I/. Fore femora unarmed, 

 c. Wings wanting or reduced to pads (or very short and weak if fully developed). 

 d. Mouth-cone shorter than its width at base, labrum not narrowed in the 



middle and with a blunt tip (31) Cephalothrips Uzel. 



d\ Mouth-cone as long as its width at base, labrum sharply pointed. 



€. Cheeks with spine-bearing warts (32) Malacothrips Hinds. 



e^. Cheeks without spine-bearing warts (33) Neoihrips Hood. 



cf . Wings fully developed. 

 d. Wings constricted in the middle. 

 e. Mouth-cone broadly rounded at the end; wings only slightly narrowed 



in the middle (34) Cryptothrips Uzel. 



e^. Mouth-cone constricted at the end; wings considerably narrowed in 

 the middle and having somewhat the shape of a sole. 

 /. Head nearly twice as long as wide; mouth-cone reaching nearly across 



prosternum (35) Leptothrips Hood 



f\ Head only a little longer than broad; mouth-cone reaching only to 



middle of prosternum (36) Zygolhrips Uzel. 



d\ Wings of equal width throughout. 



e. Cheeks with a few very small warts, each of which bears a small spine. 



(37) Phlceothrips Haliday. 



e^. Cheeks without such warts (38) Liothrips Uzel. 



a'. Head more than twice as long as wide; individuals very large. 



b. Antennae one and one-sixth to one and one-half times as long as head; fore 

 tarsi of females unarmed, of males each armed with a tooth; 

 without prominent spines along fore margin of prothorax. 



(39) Idolothrips Haliday. 

 b'. Antennae twice as long as head; color brown to dark brown; fore tarsi not 

 armed; four prominent spines along fore margin of protho- 

 rax, two of which stand on the outer angles. 



(40) Megalothrips Heeger. 



KEY TO THE SPECIES. 



(1) Genus Orothrips Moulton. 



1. Segment 2 of antenna quite uniform brown; segment 3 not constricted in the middle; 



sense areas on segments 3 and 4 elongate. 



(1) Orothrips kclloygii Moulton. 



2. Segment 2 of antenna brown at base, yellow at tip; segment 3 constricted in the 



middle; sense areas on segments 3 and 4 ovoid. 



(2) Orothrips kelloggii yoseviitii, new variety. 



(4) Genus JSolothrtps Haliday. 



1. Fore wings with dark cross-bands. 

 a. White band around abdominal segments 1 and 2; last four segments of antennae 

 much longer than fifth. 

 b. Segments 2 and 3 of abdomen white; wings wath cross-veins. 



(5) ^olothrips bicolor Hinds. 

 I/. Segments 1, 2, and posterior half of 3 white; wings without cross-veins. 



(6) ^olothrips vespiformis Crawford. 



