506 Mr. D. M. S. Watson on the Cynodontia. 



backwards, sides of base oblique and emarginate, median 

 line very fine, surrounded by a depressed area, transverse 

 impressions, and especially basal fovea?, well marked ; surface 

 coarsely punctate. 



Elytra rather Hut, parallel, not quite twice as long as wide, 

 truncate, and with a fine membranous border at apex, punc- 

 tate-striate, intervals slightly convex, with two rather irre- 

 gular rows of punctures, interval 8 rather wider than the 

 others, more closely and quite irregularly punctate ; front 

 spot rounded, placed just before middle, and covering intervals 

 3—7, hind spot close to apex, covering intervals 1—6 (though 

 leaving a thin dark line at suture), tapering outwards. Under- 

 side rather shiny, middle of head and of sterna with only a 

 few scattered punctures. 



In appearance strikingly like Macrochilus trimaculatiis, 

 Oliv., the general form and the elytra I spots being almost 

 exactly similar; the size, however, is uniformly smaller, 

 while the form of the labium and maxillae and the totally 

 different shape of the last joint of the maxillary palpi give an 

 easy means of discrimination. 



British Sikkim : Gopaldhara (H. Stevens), 1 ex., type. 

 Mr. Stevens has kindly allowed me to retain this in my 

 collection. 



Burma : Tenasserim, Mergui (Doherty). Assam : Sadiya 

 [Doherty] . — British Museum. 



British Sikkim: Pashok, 2500' (L. C. Hartless). — Indian 

 M useum. 



Bombay: Bassein Fort. Bengal: Ohapra (Mackenzie'). — 

 Pusa Agric. Res. Inst. 



Indo-Ohina : Yen Bay (Dr. DeyroUe). — Coll. E. Fleutiaux. 



Indo-China : Tonkin, Hoabinh ; Annam, Cuarao ; Laos, 

 Vientiane, Muong Sai, Sop Choun, Natung, Houei Ko (i?. 

 Vitalis de Salvaza). 



Indo-China : Annam, Vinh. — Brussels Museum. 



LIX. — On the Cynodontia. By D. M. S. WATSON. 



In various recent papers I have divided the advanced 

 Theriodont reptiles which possess a secondary palate of 

 mammalian type into two groups : — 



The Cynodontia, which have no suborbital vacuities. 



The Bauriamorpha, which have large suborbital vacuities. 



The former group has descended from the Gorgonopsians, 



