220 Mr. R. S. Bagnall on the Class'ijlcalion 



23. Cory dor as egues. 

 Steind. Sitziingsb. Akad. Wien, Ixxiv. 1877, p. 140, pi. xii. fig. 3. 



Depth of bodj 2^ in tlie length, length of head 3^. Diam- 

 eter of eye 4 in length of liead, interoibital width 2^. Snout 

 as long as postorbital part of head ; suborbital very deep, 

 reaching upper lip ; barbel reaching gill-opening. Dorsal I 7 ; 

 spine nearly as long as head ; free edge of fin convex, with 2 

 rays longer than spine ; 3 median scutes before adipose fin. 

 Anal I 7. Caudal emarginote. Pectoral spine reaching 

 middle of pelvics. Scutes |^^ ; humeral shields large, 

 reaching base of pelvics and meeting below. Brownish 

 above, yellowish below, with a broad blackish lateral band 

 tapering backwards ; fins immaculate. 



Amazons (Teffe and Cudajas). 



XXV. — Some Considerations in regard to the Classification 

 of the Order Thysanoptera. By RiCHARD S. Bagnall, 

 F.L.S., F.E.S., Hope Department of Zoology, University 

 Museum, Oxford. 



Since my papers on the Urothripidse were published *, I 

 have come to the conclusion that in retaining that family as 

 a family of the suborder Tubulifera unnecessary difficulties 

 will be created. I have already shown that whereas Uro- 

 thrips superficially resembles the Tubulifera very closely, it 

 really differs from true Tubulifera more strongly in its 

 structure than do the members of the suborder Terebrantia ; 

 or, in other words, the two suborders Tubulifera and Tere- 

 brantia are more closely related to each other than Urothrips 

 to either. I am now convinced that the only course one can 

 reasonably take is to erect a new suborder for the reception 

 of the family Urothripidse, for which 1 propose the name 



POLYSTIGMATA, 



suggested by the character that appears to me to be of the 

 greatest taxonomic value. 



It will be well to briefly diagnose the three suborders. 



* Annales Musei Nationalis Iluiigarici, 1909, \n. pp. 125-136, pi. iii., 

 Sc Meiii. 1" Coiigres International d'Entomologie, 1910, pp. 283-288. 



J! 



