1899.] 205 



described (I. c.) as var.fasciafa, of which the examples then known 

 showed only indistinct whitish fascia? : this distinct fascia is indicated 

 on the under-side of the wing by a white costal spot. 



The cold ungenial weather during last spring doubtless accounts 

 for the larvae having been so late in pupating, and is probably to some 

 extent responsible for so many of the larvae having died off instead of 

 pupating. At any rate, Mr. Vine searched most diligently, on my 

 behalf, during the spring for the larvae in their native haunts, but 

 only succeeded in finding one solitary individual which had not yet 

 assumed the pupa state when it reached me on June 13th. 



The Close, Salisbury : 



Jttlt/ 24,th, 1899. 



A NEW GENUS OF TERMITOPHILOUS STAPHYLINIDM FROM 



BORNEO. 



BY D. SHARP, M.A., F.R.S. 



Although the number of Termitophilous insects at present known 

 is very much smaller than that of the dwellers in ants' nests, it is 

 probable that this is due to the comparatively small extent of investi- 

 gation that has been made of the dwellings of Termites. Termito- 

 philous insects seem to be much more aberrant than myrmecophilous. 



DIOXETJTA, gen. nov. 



Pedes tenues ; tarsi 4, 5, 5-articulati, posteriores articulo lasali 

 elongato. Caput angustum, posterius ferparum constrictum. Coxcb omnes 

 contiguce. Metasternum brevissimum. Abdomen dilatatum, apicem versus 

 acuminatum. 



This genus is not at all closely allied to any other known to me ; 

 in form it a little approximates to Apteranillus, but the resemblance 

 is only a remote one, and there is but little similarity between the two 

 in the structure of the sterna. These parts seem to be very peculiar, 

 the mesosternum being membranous with a chitinous ridge extending 

 longitudinally along the middle, while the metasternum is so abbreviate 

 in the middle that the apices of the middle coxae in repose almost 

 touch the bases of the hind legs. This character and the peculiar 

 shape give the genus an isolated position in the Myrmedoniina division 

 of the Aleocharidce. The parts of the mouth, so far as they can be 

 seen, exhibit no peculiarity of structure. The presternum is small 

 and apparently of almost membranous consistence. 



A single example only having been secured, I am unable to give 



