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. 



