On the Nematode Genus Tanqun, R. Blanchard. 223 



bristles of both nintli and tenth segments long ; a dorsal 

 series of minor setas on 9 and a dorsal pair on 10 j the latter 

 segment divided above. 



Type. Hope Department of Zoology, University Museum, 

 Oxford. 



Hah. N. Queensland, Brandon ; on a composite flower 

 {?BeUanthus sp.), 16. x. 14 {E. Kelly). 



Near P. glaucus, Bagn. (a South- African species), from 

 which it may be separated, apart from coloration, by the 

 fewer setse on veins of fore- wings and the chsetotaxy of the 

 apical abdominal segments. 



XIX. — The Nematode Genus Tanqua, R. Blanchard. 

 By H. A. Baylis, B.A. 



(Published by permission of the Trustees of the British Museum.) 



Up to the present time only a single species of this remark- 

 able genus appears to have been recognized, viz. tlie interesting 

 form Tanqua tiara (v. Linst.). This is a nematode of medium 

 size, somewhat resembling an Ascarts in general build, and 

 inhabiting the stomach and intestines of reptiles of more or 

 less aquatic habits. It was first recorded, under the name 

 of Ascarts tiara, by von Linstow (1879), from "Varanus 

 ornatus^^ (? V. alhigularis'^) in Natal. The other hosts and 

 localities from which it has been recorded in published papers 

 are : — Varanus salvator, Sumatra (Parona, 1898) ; V. gouldii, 

 Australia or New Guinea — precise locality unknown (Parona, 

 1898) ; V. hengalensis, Ceylon (von Linstow, 1904) ; and 

 V. niloticus, White Nile (Leiper, 1908). Leiper also men- 

 tions tlie occurrence of a very similar form in Hydrosaurus 

 hivittatus from the Federated Malay States. 



I have now to add that I have examined specimens, which 

 I believe to belong to this species, (1) from a lizard (probably 

 Varanus niloticus, though I liave no information regarding 

 its determination), from Accra, Gold Coast Colony ; (2) from 

 Tropidonotus guincunciatus (T. asperrimuSj Blgr.f), from 

 Ceylon ; and (3) from Varanus exanthematicus, Northern 



* Dr. G. A. Boulenger informs me that V. alhigularis is the form most 

 nearly related to V. ornatus, occurring in Natal. 



t l)r. Boulenger regards the Ceylon form of T. quincimciatus as a 

 distinct species. 



