KEY TO THE SPECIES. 15 



2. Wings wanting. 

 a. Body very dark brown, nearly black; pterthorax yellow to yellow-brown; legs 



brown (27) Scricothrips apteris Daniel. 



a\ Body uniform brown; surface of body strongly reticulated; legs yellow. 



(28) Sericothrips reticulatus Moulton. 

 a'''. Body and legs uniform brown; four stout spines on dorsal side of segment 9. 



(29) Sericothrips stanfordii Moulton. 



(14) Genus Chirothrips Haliday. 



1. With two moderately long spines at each hind angle of prothorax;. two longitudinal 



veins in each fore wing; fore wings gi-ay-brown. 



(31) Chirothrips manicatns Haliday. 



2. With one moderately long spine at each hind angle of prothorax; one median longi- 



tudinal vein in each fore wing, five spines on apical part of wing 

 where second vein should be (33) Chirothrips mexicanus Crawford. 



3. Without spines at hind angle of prothorax. 



a. Abdomen light yellow (34) Chirothrips obcsus Hinds. 



a'. Abdomen light brown (35) Chirothrips crassus Hinds. 



(18) Genus Euthrips Targioni-Tozzetti. 



1. Without prominent spines on fore angles of prothorax, longitudinal veins not regu- 



larly set with spines. 

 a. Head noticeably wider than long; general color white to light yellow or orange. 



6. Last two segments of antennae rather long and slender, and together about two- 

 thirds as long as segment 6; wings shaded brown, with transparent 

 whitish areas near base and at tip; ring vein and longitudinal veins 

 not conspicuous (39) Euthrips orchidii Moulton. 



V. Last two segments of antennae not noticeably elongate and slender and together 



about one-half as long as segment 6. 



c. Ring vein and at least a part of fore vein conspicuous; color of body orange- 

 yellow. 



d. Wings shaded brown; fore part of longitudinal vein alone conspicuous. 



(40) Euthrips parvus, new species. 



d''. Wings not shaded brown; both longitudinal veins present, with three or 



four scattered spines on each, one of which 8tands.at the abrupt ending 



of each vein (41) Euthrips citri Moulton. 



c'. Ring vein and longitudinal veins not conspicuous ; group of six spines on basal 

 part of wing where anterior vein should be and nine on outer hah 

 where posterior vein should be; color of body and wings clear white, 

 outer half of antennse dark brown. . . (42) Euthrips albus, new species. 

 a\ Head about as long as wide; general color brown, thorax sometimes orange- 

 brown. 

 b. Basal segment of antennae concolorous with head and with segment 2; wings 

 brown, with an irregular, somewh'at triangular transparent area 

 near base; two long prominent spines between posterior ocelli; 

 without prominent spines along posterior margin of prothorax; legs 

 brown, concolorous with body, except tarsi, which are lighter. 



(43) Euthrips pj/ri Daniel. 

 b\ Basal segment of antennae lighter colored than head and segment 2; wings 

 uniform light brownish-gray, without whitish area near base. 



(44) Euthrips chrhomii Moult-on. 



2. With spines on fore angle of prothorax; longitudinal veins set regularly with 



spines. 



