Hood — An Outline of the Insect Order Thysanoptera. 59 



j. — Last abdominal segment tubular in form, 

 sides slightly converging to apex ; tergum of 

 abdominal segments 2-9 not transversely 

 linear, 9 usually but little wider than long. 

 (About 75 genera and 368 species, of which 

 one is fossil, represented in all parts of the 

 world. ) . . Family Phlceothripid^ Uzel, 1895. 

 (=Family Tuhuliferidse Beach, 1896.) 

 (=Family Ecacanthothripidx 



Bagnall. 1912, pars.) 

 jj. — Last abdominal segment not at all tubular 

 in form, greatly swollen, parabolic in dorsal 

 aspect ; tergum of abdominal segments 2-9 

 transversely linear, in the only known genus 

 fully five times as wide as median length. 

 (One recent genus and species of unknown 

 habits, from Australia.) 



Family Pygothripid^ Hood, 1915. 

 ii. — Last abdominal segment (the tube) greatly 

 elongate, three or four times as long as head and 

 nearly or quite equal in length to the remainder 

 of abdomen. (3 genera, with 4 (possibly 5) recent 

 Ethiopian and Oriental species. ) 



Family Hystricothripid^ Karny, 1913. 

 hh. — Male with a stout, tube-like projection on each 

 side of segment 6 of abdomen. (5 genera, em- 

 bracing 12 recent species of large size, now known 

 from almost all parts of the world. ) 



Family Megathripid^ Karny, 1913. 

 gg. — Head more or less produced in front beyond eyes; 

 vertex conical, usually prominently overhanging 

 base of antennae, bearing the anterior ocellus at its 

 extremity, and usually with a strong bristle in front 

 of eye. (11 genera and 55 species, all recent; the 

 giants of the order, represented in all regions except 

 the Palsearctic. ) 



Family Idolothripid^ Bagnall, 1908. 

 ff. — Maxillary palpi one-segmented. Antennfe four- to 

 seven-segmented. Hind coxae more widely separated 

 than front or middle pairs. Ninth abdominal segment 

 longer than 8; terminal abdominal hairs very much 

 longer than tube . . . Superfamily Urothripoidea nov. 

 (=Suborder Polystigmaia Bagnall, 1912.) 

 k. — One family, from Africa and southern 

 Europe, comprising 4 genera and 5 species, 

 all recent. 



Family Urothripid^E Bagnall, 1909. 



