Go6 Mr. II. B. Preston on new Pehcypods 



Mimacroea costleyi, sp. n. 



(^ . Allied to 71/. marshalli, Trimen, from which it differg 

 on the upperside by the fulvous-ochreous areas beiiifr brighter 

 and more extensive and by the white apical band bein<^ 

 broader, less oblique, more sharply defined, and touching the 

 ochreous area at vein 4. The portion between veins 6 and 7 

 ])rojecting slightly towards the cell. The black terminal 

 border to the hind wing is considerably narrower than in 

 M. marshalli. The veins of both wingS'are concolorous with 

 the areas which they traverse, excepting the white band of 

 the fore wing, where they are brown. On the underside the 

 fore wing differs from that of M. marshalli by the white 

 apical band being as described above and on the hind wing 

 by the ground-colour being yellow, with each vein bordered 

 on both sides with cream, and by a marginal row of black 

 sagittate markings which each black vein centres. Thorax 

 and palpi black ; head and legs black, with a few white 

 spots; abdomen yellow, with a few black spots below. 



Expanse 60 mm. 



Hah. Mlanje,Nyasaland, British Central Africa {E. Coslley- 

 White). 



Type : British Museum. 



This is a well-marked form, distingni-shed at once from the 

 insect I have compared it with by the potitiou of the while 

 apical band on the fore wing. 



LXX. — Characters of Six neio Pelecypods and Two nfw 

 Gastropods from the Falkland Islands. By 11. B. 

 Preston, F.Z.S. 



[Plate XXI.J 



LmviUtorina bennetti, sp. n. (Fig. 1.) 



Shell minute, conically fusiform, with obtuse apex, solid, 

 dark brownish black ; whorls 5h, regularly increasing, 

 having a somewhat roughened and weathered appearance, 

 the last whorl rather swollen ; suture impressed ; columel a 

 descending in a curve ; peristome continuous, slightly dilated 

 below, elsewhere thickened, but not reilexed ; aperture 

 roundly ovate ; interior of shell livid blackish violet. 



Alt. (nearly) 2*25, diam. maj. (nearly) 1*25 mm. 



Uah. Port Stanley Harbour, Falkland Islands; associated 

 with Tonicia {A. G. Bennett). 



