538 MR. C. J. GAHAN ON THE [DeC. 4, 



Leptopoma mouhoti, var. 



Testa conica, tenuis, semipellucida, umbilicata. alba, interdum infra 

 peripheriam. fusco tincta, epidermide tenui lutescente induta ; 

 spira conica, mediocriter elevata ; anfracfus 5, convexi, liris 

 spiralibus fiUformibus {in anfr. penultimo circiter 6) instructi, 

 striisque inter liras sculpti, incrementi lineis obliquis ornati ; 

 ultimus liris 12 {inediana ad peripheriam cceteris paulo majore) 

 succinctus ; apertura fere circularis, longit. totius ■!■ paulo supe- 

 rans ; peristoma anguste expansum, marginibus callo tenuijunctis. 

 Long. lOj millim., diam. maj. 10^. 

 Hab. Found on mossy trunks of trees in the upper part of the 

 island {J. J. Lister'). 



In sculpture the specimens from Christmas Island agree exactly 

 with L. mouhoti, Pteiffer, from Camboja. They differ in being 

 broader and in having the spire a trifle less elevated. The peri- 

 stome also is slightly narrower. Until I have an opportunity of 

 examining a larger series of the two forms, I think it best not to 

 separate them specifically. 



8. On the Coleoptera of Christmas Island. 

 By C. J. Gahan, M.A. 



[Eeceived October 15, 1888.] 



The Coleoptera in Mr. Lister's collection consist of about 70 speci- 

 mens belonging to 20 different species, and to almost as many distinct 

 genera. The genera mostly, and in some cases also the species, are 

 of wide distribution. One genus is new ; this, while closely allied to 

 an Indo-Malayan genus, is related also to a distinct Australian genus. 



In the following list I have indicated the genera and, as far as 

 possible, the species, but the latter, I have found it impossible in 

 many cases to determine without the expenditure of considerable 

 time. Those which I believe to be new are described below. 



MoRio ORiENTALis, Dejcau. 



HOLOLEPTA, Sp. 

 P^DERUS, sp. 



Par^gus i.isteri, n. g. et n. sp. 



Leptaulax, sp. 



Chrysodema simplex, C. "Waterh. 



Stigmatium, sp. 



Mnephilus, sp. 



HOPATRUM, sp. 



Sessinia, sp. 



