KEY TO THE GENERA. 11 



II. SUBORDER TUBULIFERA. 



Female without sawlike ovipositor. Terminal abdominal segment tubular in both 

 sexes. Wings usually present; fore pair only with a rudimentary median 

 longitudinal vein ; membrane of wings without microscopic hairs. Antennae 

 with eight segments, or sometimes only seven. 



(C.) Family Phlceothripid^. 



KEY TO THE GENERA. 



A. Family Jj^olothripid^. 



1. All segments of antennae freely movable and diminishing in size gradually toward 



the tip. 

 a. Maxillary palpi with seven or eight segments; wings with bands. 

 b. Wings with dark cross-bands; maxillary palpi with seven segments. 



(1) Orothrips Moulton. 

 y. Wings with dark longitudinal bands along posterior margin; maxilliary palpi 



with eight segments (2) Erythrothrips new genus. 



a\ Maxillary palpi three-segmented, labial palpi two-segmented; wings without 



dark cross-bands (3) Ankothrips Crawford. 



2. Last four segments of antennae closely united and together shorter or a little longer 



than the fifth; maxillary palpi three-segmented, labial palpi 

 four-segmented (4) Molothrips Haliday. 



B. Family Thripid^. 



1. Antennae with seven segments. 



a. Body with deeply reticulated structure; wings broad, reticulated, and without 



front fringe (5) Parthenothrips Uzel. 



a'. Body without reticulated structure; wings pointed, front fringe present. 



6. Maxillary palpus with two segments (6) Baliothrips Haliday. 



y. Maxillary palpus clearly with three segments (7) Thrips Linnaeus. 



2. Antennae with eight segments (with six segments in Aplinothrips rufus var. con- 



natticornis) . 

 a. Body with reticulated structure, wings present. 



h. Last segment of antenna long and slender and very much longer than segment 7. 

 c. style longer than segment 6; prothorax much shorter than head; spines on 



veins pointed (8) Heliothrips Haliday. 



</. style shorter than segment 6; prothorax about as long as head; spines on 

 wings long, strong, and with dilated tips. 



(9) Echinothrips new genus. 

 h'. Last segment of antenna not noticeably long and slender and only a little 

 longer than segment 7; style shorter than segment 6. 



(10) Dictothrips Uzel. 

 a' . Body without reticulated structure (except in Sericothrips rcticulatus) . 



b. Abdomen having a silky luster (when living or in dried condition), because 

 of covering of extremely small hairs. 



(11) Sericothrips Haliday. 

 b\ Abdomen without small hairs giving it a silky luster. 



c. Last two antennal segments longer than the sixth (12) Raphidothrips Uzel. 



&. Last two antennal segments shorter than the sixth. 

 d. Terminal segment of abdomen with a pair of extremely stout, short spines 



near the tip above (13) Limothrips Haliday. 



d\ Terminal abdominal segments without stout spines. 



