Hood — An Outline of the Insect Order Thysanoptera. 57 



a. — One family of world-wide distribution, comprising 3 genera and 

 6 species of fossil forms;* in addition to the recent ones. 



Family ^olothripidjE Uzel, 1895. 

 (=Family Coleoptrata Haliday, 183G.) 

 (=FamiIy Coleoptratidse Beach, 1896.) 

 b. — Labial palpi with fewer segments than the maxillary palpi; 

 antennal segments often freely movable. 



c. — ]Maxillary palpi 7 or 8 segmented ; labial palpi 8-5 seg- 

 mented. (4 monotypic recent genera, from North America 

 and Australiat) . . . Subfamily Orothripin^ Bagnall, 1913. 

 cc. — Maxillary palpi 3 segmented ; labial palpi 2 segmented. (2 

 genera, with 6 recent and 1 fossil species, recorded from 

 Europe, Africa, and North America. ) 



Subfamily MELANOTHRiPiNiE Bagnall, 1913. 

 bb. — Labial palpi 4 segmented ; maxillary palpi 3 segmented; dis- 

 tal segments of antennae always closely united. (4 genera and 

 18 species, all recent, recorded from Europe, Africa, and North, 

 Middle, and South America. ) 



Subfamily ^Eolothripin^ Bagnall, 1913. 

 AA. — Ovipositor curved downward. Wings narrower, almost always 

 pointed at tip. Body more or less depressed. Antennte 6 to 8 seg- 

 mented (except in Hete roth ripidee). . . Snperfamily Thripoidea nov. 



(=Tribe Thripides Bagnall, 1914.) 

 b. — Antennae 9 segmented, without apical stylus ; segments 3 

 and 4 enlarged, conical, without sense cones but with sensory 

 band at apex. Fore tarsus with claw-like appendage at base 

 of second segment. (One genus with 6 recent species, known 

 from North and South America and the West Indies. ) 



Family Heterothripid^ Bagnall, 1912. 

 bb. — Antennae six- to eight-segmented, usually with an apical 

 stylus of one or two segments ; segments 3 and 4 not conical, 

 usually with sense cones, rarely with a sensory band at apex. 

 Fore tarsus never with an appendage at base of second segment. 

 c. — Antennae not moniliform, six- to eight-segmented, always 

 with an apical stylus of one or two segments ; segment 3 

 usually, and 4 always, with sense cones, never with a tym- 

 panum-like sense area on dorsum of apex. Pronotum with- 

 out longitudinal dorsal sutures; anterior and posterior 

 femora not enlarged. Abdomen usually sharply conical at 

 tip; ovipositor almost invariably well developed, 

 d. — Sixth antennal segment large, never minute in compari- 

 son with fifth, generally the largest in entire antenna. 



• It has been impossible txD assign all of these fossil species to the subfamilies indi- 

 cated below. 



tThe Orothrips australis Bagnall (Ann. Mag. Nat. Hist., Sth Ser., Vol. 13, p. 287; 

 March, 1914) is not congeneric with the North American Orothrips kelloggii Moulton, 

 the type of the genus, and for its reception the new name Desmothrips is hereby 

 proposed. From Orothrips this new genus may readily be separated by the closely 

 united fifth to ninth antennal segments, the single sense areas on segments 3 and 4, and 

 the much narrower body and wings. 



