378 Mr. 0. Thomas on 



has been patched at some time. The T. Irigilta jjjroup is 

 so characteristically different in pattern froai the T. hecahe 

 group, that my explanation seems infinitely more probable 

 tlian that a form having the pattern of T. Boisdavaliana ? , 

 but (unlike all other species of the genus) having both sexes 

 coloured pale yellow, should suddenly appear in the midst 

 of the T. hrigitta group. I believe T. hapale to be distinct 

 from T. floricola, but to be a very nearly related species. 



35. Catopsilia florella^ Fabr. 



J , S.S. < Kaiser,' off Zanzibar Island, 20th March ; be- 

 tween Katunga and Mandala, 8th April ; 6 6^2, Mandaha, 

 10th and 11th April, 1899. 



36. Papilio demodicusy Esper. 



Chinde, 29th March, 1899 ; caught near the bank of the 

 Zambesi. 



Hesperiidae. 

 37. Parosmodes icteria^ Mabille. 



Between Katunga and Mandala, 8th April ; Mandala, 

 10th and 11th April, 1899. 



38. Baoris fatuellusy Hopffer. 

 Mandala, 11th April, 1899. 



39. Ehopalocamjjta forestan , Cramer. 

 Mandala, 11th April, 1899. 



XLIII. — Descriptions of new Rodents from the Orinoco and 

 Ecuador. By Oldfield TllOMAS. 



Rhipidomys marmosuruSf sp, n. 



Size medium. Fur close, rather less woolly and more 

 OryzoynT/s-Yikii than in typical Rhipidomys ; the hairs about 

 8-9 millim. long on the back. General colour above rich 

 reddish fulvous, finely lined with black. Head paler and 

 greyer, no definite face-markings. Ears large, witli but little 

 anterior basal projection; their backs thinly haired, black, 

 contrasting markedly with the general colour. Sides paler 



