56 MR. A. G. BUTLER ON LEPIDOPTERA [Jan. 17, 



12. Unio iEGYPTiACUs, Caillaud. 



Hab. Various parts of the Nile ; Albert Nyanza (Baler). 



13. Unio caillaudi, Ferussac. 

 Bab. Same as preceding. 



14. Unio bakeri. 



Unio bakeri, H. Adams, Proc. Zool. Soc. 1866, p. 3/6. 



Hab. Albert Nyanza (Bal'er and Emin). 



Only one fresh and two dead valves without the epidermis were 

 obtained by Sir Samuel Baker. Five odd valves, -which have been 

 presented by ISIr. Waller to the Museum and are in good condition, 

 show that this species, like most others of the genus, is very variable 

 in form, and that the extent and coarseness of the zigzag wrinkling of 

 the surface is very inconstant. A number of so-called species of Unio 

 described by Bourguignat ^ from the Victoria Nyanza approach very 

 closely to U. bakeri, and indeed I should be surprised if several of 

 them on comparison might not satisfactorily be classed with it. 



15. Unio acuminatus. 



Unio acuminatus, H. Adams, Proc. Zool. Soc. 1866, p. 376. 



The two valves collected by Sir S. Baker are all that is known of 

 this species. It is of a more slender form than the preceding, and 

 has down the posterior dorsal area two subparallel shallow grooves 

 or impressed rays with a raised space between them. This feature 

 is represented in U. bakeri by two divergent colour-rays in the same 

 part, but rather more remote from one another. 



5. On the Lepidoptera received from Dr. Emin Pasha. 

 By Arthur G. Butler, F.L.S., F.Z.S., &c. 



[Eeceived December 6, 1887.] 



The Lepidoptera received from Dr. Emin Pasha are referable to 

 no less than 156 species, of which thirteen Butterflies and two 

 Moths are new to science ; one or two of these are extremely variable 

 and, had the extremes only been obtained, might fairly have been 

 regarded as distinct species. 



The collection contains a combination of South-western and 

 North-eastern forms, by far the greater number, especially of those 

 obtained at Wadelai in 1887, being identical with Abyssinian 

 species ; a few more southerly forms, identical with species from 

 Kilma-njaro, crop up here and there, such as Junonia infracta, 

 Terucolus auriyineus, and others. 



^ Moll. fluT. du Nyanza Ouker6w6 (Victoria Ns'anza), Paris, 1883, pp. 3-15. 



