" Daculum^^^ in certain S<j>iirre/s. 385 



about one-fourth to oue-sixlli ot its longlh, so that it projects 

 iVoiu the shaft as quite a k)\v ciittiiii^-ljlade. 



In the more specialized type the hiniina is attached to the 

 side of tlie end ot" the shatt, and is devi loped into a lonj^ trian- 

 gular and pointed blade, nciuved ii.ickwards towards the hilt 

 of the shaft, which it may equal or exceed in lent^th. 



A considerable nuinUer of species which havt! been referred 

 to " iSc/f/rM.* " have bacula of tin; less specialized compouml 

 type, while Lnriscus^Tumiops, Ih-emoint/s, S^untiosciurus, and 

 a further number of ^'' Sciurus" have the more specialized 

 type last described. 



But since the possession of such striking; and sharply defin- 

 able characters must indicate bl)od-relationship, it is evident 

 that forms with all three types of l>acida should not be |)Uf into 

 the same genus, Sciurus, and I would therefore withdraw 

 from that genus all those with compound bacula, and divide 

 these again into two genera corresponding to the less and 

 the more specialized forms above described. 



Of the first of these, that with the narrow-bladeil baciilum, 

 the name would appear to be Callosdurus, Gray *, with type 

 ^^ Sciurus^^ roffi'sii. Other synonymic names are Batjinia, 

 Grayt (type S. notatus), Erytlwoscinrus, Gray J (ferru- 

 gtneiis), and Heterosciurus, Trouessart § [ferrugineus). 



The species that I know to be referable to Gallosciurus 

 are as follows, the names put in the first column being those 

 of which the character of the baculum has been definitely 

 verified, while the names in brackets indicate a number of 

 prominent species presumed to belong to the genus from 

 their near alliance to the verified species : — 



Callosciunis atrwlorsalis .... {rubcculus.) 



„ caniceps {concolor,i/riseimanus,epomophoncs.) 



„ castaneoventris . . {(fordoni, slijani.) 



„ eri/thr(eus {ferruff incus, Jinlai/soni.) 



„ notatun (vittatus, niijrocittatus, saturntiis.) 



„ pluto ((Uricapillus,c(troli,/)iilu<fisis,eri/t/iro- 



melas, prevostii, rajftvsii, rufo- 



nit/er.) 

 „ sladeni {hariujtoni.) 



Curiously enough, though there are four names available 

 for the first genus, there are non..' for the second, that with a 

 long recurved blade on the i)acidum, and I would therefore 

 ])ropose to give it the name of Tomeutes ||. 



• Ann. & Mag. Nat. Hist. (3) xx. p. 277 (1867). 

 t T. c. p. 27l>. X T. c. p. 265. 



§ Le Nat. ii. no. 37, p. 2!>2 (ia<0). 

 II Based on Tofifvs, a shoemaker's kuife. 



