THYSANOPTERA 677 



of whip-like terminal hairs in the male ; and by the fact that the posterior pair of coxae 

 instead of the intermediate pair are the most widely separated. The antennae, too, are 

 distinctly typical in the family Urothripidae. 



The sub-orders may be tabulated as follows : 



I. Female without an ovipositor ; last abdominal segment tubular in both sexes. 



Lower and upper wings, when present, similar in structure, with only one 

 (partially developed and sometimes obsolete) median longitudinal vein which 

 never reaches to tip of wing Sub-order Tubulifera. 



i. Eleven pairs of stigmata present ; hind pair of coxae most widely separated. 

 Antennae broad, seven-jointed. Ninth abdominal segment elongate, 

 longer than preceding ; intermediate terminal hairs obsolete. Terminal 

 hairs in male whip-like, in female simple ."...Fam. Urothripidae Bagnall. 



ii. Four pairs of stigmata present ; intermediate pair of coxae most widely 

 separated. Antennae more or less slender, eight-jointed, joints elongate. 

 Ninth abdominal segment transverse, as long as or shorter than the 

 preceding ; intermediate terminal hairs present, terminal hairs simple in 

 both sexes' Fam. Phloeoiliripidae Haliday. 



II. Female with a saw-like ovipositor ; last abdominal segment of female usually 



conical ; that of male rarely like the female's, but usually bluntly rounded. 

 Fore-wing with at least one longitudinal vein reaching from base to tip of 

 wing Sub-order Terebrantia. 



i. Antennae nine-segmented. Wings (when present) broad and rounded at 

 the tips ; fore-wings with cross veins. Ovipositor of female up-curved. 

 Maxillary palpi geniculate, three- to seven-segmented ; labial palpi two-, 

 four- or five-segmented Fam. Aeolothripidae Haliday. 



ii. Antennae six- to eight-segmented. Wings (when present) usually narrow 

 and pointed at tips, without cross veins. Ovipositor of female down- 

 curved. Maxillary palpi non-geniculate, two- or three-segmented, labial 

 palpi always two-segmented Fam. Thripidae Haliday. 



Only the latter family of each sub-order is represented in the Hawaiian fauna ; 

 representatives of the family Aeolothripidae may however be met with when further 

 attention is given to the order. 



We should here draw attention to the genus Heterothrips Hood, the species of 

 which possess characters common to both families, and also to certain anomalous 

 Indian and African material in our possession. 



Sub-order TUBULIFERA Haliday. 



Fam. PHLOEOTHRIPIDAE Haliday. 

 Dermothrips, gen. nov. 



Surface rough and dull ; head, prothora.x, fore-co.xae and all femora strongly 

 scabrous. 



' These characters in the main part apply also to species of the Sub-order Terebrantia. 

 F. H. III. 87 



