212 Mr. W. L. Distant on African Penfatomidre. 



XXI. — On an undescribed Species of Dorcasia. 

 By Hugh C. Fulton. 



Dorcasia ponsonbyi, sp. n. 



Shell depressed globose, moderately umbilicated, ratlier 

 thin, subtransparent, yellowish brown above, whitish below ; 

 whorls 4?j, slowly increasing, nucleus almost smooth, lower 

 whorls with rather rough and irregular oblique striae, last 

 whorl covered with a microscopic granular sculpture ; peri- 

 stome thickened, yellow, margins joined by a slightly raised 

 reddish callus, aperture subovate, pellucid within. 



Maj. diam. 27, min. 22 ; alt. 16 mm. 



Hab. Cape of Good Hope. 



This shell has often been confounded with Dorcasia lucana, 

 Miiller, from which it can be readily separated by its depressed 

 form and microscopic granular sculpture. The specimens of 

 lucana seen by me are more or less malleated on the last 

 whorl, a feature that is absent in ponsonbyi, which has also 

 half a whorl less. In some specimens the peristome is 

 whitish, in others it is of a reddish colour. 



I have much pleasure in naming this shell in honour of 

 J. H. Ponsonby, Esq., F.Z.S., who has done so much good 

 work in connection with the South-African molluscan fauna. 



XXII.— -Rhynchotal Notes.— LI. By W. L. Distant. 



African Pentatomidae. 



(Continued from p. 99.) 



Neocrollius, gen. nov. 



Head shorter than pronotum, longer than broad, the 

 lateral and apical margins very strongly reflexed, the lateral 

 margins concavely sinuate, lateral lobes with their apices 

 obtusely acute, considerably passing apex of central lobe but 

 not meeting beyond it; eyes prominent, subpedunculate; 

 ocelli near base, much nearer eyes than to each other ; 

 antennae five-jointed, first joint not reaching apex of head, 

 first and second subequal in length, third and fourth sub- 

 equal, fifth longest j pronotum shorter than broad, but more 

 than half as long as broad, the anterior margin a little con- 

 cave, the posterior margin straightly truncate, the lateral 



