1893.] ME. E. T. WATSON ON THE HESPEEIIDJI, 3 



]\Ir. OldlieJd Thomas exhibited three adult .specimens, a male aud 

 two females, of the Borneau Monkey recently described by him 

 under the name of iScmnojiifJiccus cruci[/er^. These specimens 

 showed that this ilonliey was after all fully as large as /S'. chryso- 

 melas and S. Jiosei, the adult male having a body 520 mm. and a 

 tail 700 mm. in length ; so that the typical skin must have been 

 decidedly immature. In the male specimen the coloration was 

 almost exactly similar to that of the type, but in the two females 

 the broad black dorsal line was interrupted just below the level 

 of the shoulders for a distance of two or three inches, the hairs 

 being here red as on the flanks, but still intermixed with black. 

 In all three also there was a blackish patch 07i the postero-internal 

 side of the lo^er leg, but this patch varied in its intensity, and 

 was not visible in the type. The crest in these specimens was 

 much more de^"eloped than in the younger example, the hairs on 

 the occiput attaining a length of nearly three inches, and being 

 mixed black and red, owing to the red crown hairs mingling with 

 the black ones of the anterior end of the dorsal black line. 



These specimens had been taken on the Batang Hupar Elver, 

 AVestern Sarawak, in August 1892, by one of Mr. Hose's collectors ; 

 and Mr. D. J. S. Baily, a resident in the neighbourhood, had 

 informed Mr. Hose that he had often seen black and red Monkeys, 

 presumably of this form, in the forests of the district. 



In spite of the confii-mation gi^^en by these facts, Mr. Hose 

 himself was inclined to think that >S. crucir/er might be only a red 

 form or " erythrism " of /S'. cJinjsomelas, the common black and white 

 Monkey of Sarawak, in the company of which he believed he had 

 seen the specimen first described by Mr. Thomas. Mr. Hose 

 pledged himself specially to investigate this most interesting 

 question on his return to Borneo. 



The folloAving papers were read : — 



I. A proposed Classification of the Hesperiidee, with a 

 Revision of the Genera. By Lieut. E. Y. Watson^ 

 Madi'as Staff Corps, F.Z.S., F.E.S. 



[Received October 27, 1892.] 

 (Plates I.-III.) 



The arrangement liere proposed is based entirely upon the 

 collection of the British ^Museum ; therefore only the species repre- 

 sented in the National Collection are referred to their respective 

 genera, those species of which the types are in the collection being 

 marked with an asterisk. 



As the time at my disposal has been strictly limited, only such 

 new genera have been described as differ very markedly from those 



' Ann. Aliig. A\ II. (C.) x. p. 470 (1892). 



1* 



