.~4-t Transactions of the Society. 



its logical conclusion, we shall be compelled to erect a dispropor- 

 tionately large number of genera, each with very few species. 

 Zacher's type of Mongolabis is M. woodwardi Burr, from Western 

 Australia. Closely akin are two other Australian species, M. pacifica 

 Erichs. and M. bruwiuri Dohrn, agreeing in the external structure 

 as well as geographical distribution ; but the two latter have 

 structures in the preputial sack which, according to Zacher, would 

 at once remove them from Mongolabis, and justify a new genus. 

 The preputial sacks also have series of minute teeth, but not con- 

 fined to the pads of chitin, as in Euborellia. It is therefore neces- 

 sary to modify the original definition of Mongolabis, so as to 

 comprise the three Australian species, M. woodwardi Burr, M. 

 imcijica Erichs., and M. brunneri Dohrn. They are simply 

 Gonolabis, with short, broad, and nearly triangular metaparameres 

 (PI. XII, figs. 9-12). 



Genus Euborellia Burr. 



This genus is very much altered. It was originally erected for 

 those species of Anisolabis (in the old sense) in which the elytra 

 were present as rudiments. Zacher rightly questions the validity 

 of this feature as a generic character, and points to its extreme 

 instability of the elytra in E. jancirensis ; he also records an 

 anelytrate variety or aberration of E. moista Gene, the type species, 

 but here I am inclined to doubt the identification. Eecently 

 Father Pantel appears to have discovered a remarkable fully-winged 

 aberration of E. annulipes. Euborellia will now contain totally 

 apterous and also fully-winged species. It is now to be defined 

 by the short, broad metaparameres, which are sometimes broader 

 than long ; strongly denticulate pads are usually present in the 

 preputial sacks. The metaparameres are sometimes right-angled 

 externally, and sometimes rounded ; perhaps this feature may be 

 regarded as a generic character. 



The species which are now included in Euborellia as now 

 defined are the following : — 



1. Metaparameres externally rectangular. 



2. Elytra free, perfect or abbreviated ; wings perfect or abbre- 

 viated : — 



1. E. janeirensis Dohrn. (S. America). 



2. E. cincticollis Gerst (W. Africa). 

 2, 2. Totally apterous : — 



3. E. compressa Bor. (E. Africa). 

 1, 1. Metaparameres externally rounded. 



2, 2. Fully-winged (normally) : — 



4. E. debilis Burr (E. Africa). 



5. E. imnlana Bor. (Seychelles). 



