KEY TO THE SPECIES. 17 



a. Head about as long as wide; wings shaded gray-brown; segments 5, 6, 7, and 8 

 of abdomen without comblike arrangement of spines along posterior 

 margin; color uniformly yellow to gray -brown. 



(57) Anaphothrips hesperus new species. 



o^. Head noticeably wider than long; wings transparent; segments 5, 6, 7, and 8 



of abdomen with conspicuous comblike arrangement of spines; color 



of head and pro thorax yellowish or orange-yellow, abdomen brown. 



(58) Anaphothrips tricolor new species. 



(21) Genus Heterothrips Hood. 



1. Prothorax twice as long as head; antennae with apparently nine segments. 



a. Antennae without circles of distal sensoria on segment 4; segment 3 light yellow, 

 palest at base; segment 4 brownish, palest toward base; articulation 

 of segments brown, not clear. Wings brown, paler at base. Ante- 

 rior femora shading to yellow at apex, fore tibiae yellow, shaded with 

 brown laterally; tarsi yellow (60) Heterothrips salids Shull. 



a''. Antennae without distal circles on segment 4; segments 1 and 2 slightly lighter 

 than body, shaded laterally with black; segment 3 light yellow, 

 with a narrow subbasal white band; distal one-third clouded with 

 brown; segments 4 to 9 uniform light blackish-brown except band 

 of sensoria on segment 4. Wings blackish brown, with a broad white 

 band near base. Legs concolorous with body, except tarsi and distal 

 part of fore tibiae, which are yellow. 



(61) Heterothrips arisseviae Hood. 



2. Prothorax less than twice as long as head; antennae with apparently 10 segments; 



circles of sense areas on segments 4 and 5 (corresponding to seg- 

 ments 3 and 4 of other species of Heterothrips); segments 3 and 4 

 (corresponding to segment 3 of other species) light yellow; all others 

 dark brown. Wings light brown, basal one-sixth clear. 



(62) Heterothrips decacornis Crawford. 



(24) Genus Anthothrips Uzel. 



1. Postocular spines wanting; antennae almost uniformly brown, except segment 3 



and base of 4, which are light brown (65) Anthothrips niger Osborn. 



2. Postocular spines well developed. 



a. Segments 3 and 6 of antennae, eyes, fore tibiae, all tarsi, and other lighter parts of 

 body shaded with orange-yellow. . . (66) Anthothrips verbasci Osborn. 



a\ Intermediate segments of antennae and other light parts of body light brown. 



(67) Anthothrips variabilis Crawford. 



(26) Genus Eurythrips Hinds. 



1. Width of abdomen about one and two-thirds times that of prothorax; antennae 



twice as long as head (69) Eurythrips amplivcntralis Hinds. 



2. Width of abdomen about one and one-fourth times that of prothorax; antennae 



twoand one-half timesaslongashead. (70) Eunjthrips osborni Hinds. 



(28) Genus Trichothrips Uzel. 



1. Prominent spines on body with blunt or dilated tips; most forms very dark brown 

 or nearly black (except T. angusticeps) , usually with short wings 

 (except T. longitubus). 

 a. Each fore tarsus armed with a tooth; antennae about one and two-thirds times 

 as long as head; total body length about 1.4 to 1.7 mm. 



71924°— 11 2 



