Mr. R. S. Bagnall on neio Thysanoptera. 375 same bulk as those of the female, the vas deferens and it3 coiled-up lower end taking up a good deal of room. Equally roughly, however, the same is true of Cyclosioma, in whicli the females are larger than the males *. We may, perhaps, add that the examination of some forty radula; did not suggest that further enquiry would lead to the discovery of any sexual character in that organ. Summary. — We have not been able to find any sexual characteristic in the shell of Neritina Jiuviatilis. XLV. — Brief Descriptions of neic Thysanoptera. — IV. By ItiCHAiiD S. Bagnall, F.L.S., F.E.S. (Hope Department of Zoology, University Museum, Oxford). Suborder T E R E B R A N T i A. Family ^olothripidaB. ^olothrips gloriosus, sp. n. ? . — Length about 1*1 mm. General colour lemon-yellow. Abdominal segments 9 and 10 and tergite 8 entirely black ; tergites 5 to 7 each with a blackish-brown bar almost covering the tergite, and signs of brownish markings on t!ie anterior halves of other tergites. Eyes black. Head shaded with light greyish-brown, ex-cepting the vertex and posterior corners, and pronotum with an indistinct marking down mid-line, expanding anteriorly and posteriorly and in centre of disc. Mesonotum and trian-gular disc of inetanotum greyish-brown. Fore-wings lightly tinged with brown at base and with an irregular brown bar across second and fourth fifths; cilia brown. Autennal joints 1, 2, and basal half or thereabouts of 3 light lemon-yellow ; rest black, the apical joints somewhat greyish black. Tips of tarsi with brown fleck. Head rather long, quadrate, and not quite as long as the pronotum ; basal joint of maxillary palpus much larger than the two apical joints together ; mouth-cone large and long. Antennte about '2'5 times as long as the head ; joint 2 rather long ; 3 pedicellate, cylindrical, and narrower than 2, 4, or 5 ; ■4 distinctly angularly produced distally ; 5 to 9 closely united, with 5 as long as 6 to 9 together. 3 1'5 times as * ' Journal of Conchology,' vol. xii. (1909) p. 323.