252 GEO. H. HORN, M. D. 



The following is his table : 



A. — Anterior tarsi dissimilar in the sexes, male Jive- female four-jointed. 

 a. — Anterior tarsi slender in both sexes. 



aa. — Scuiellum invisible Leptoderus. 



hb. — Scutellum distinct. 



Body elongate, mesosternuin strongly carinate Drimeotus. 



Body oval, meso sternum feebly carinate Quaesticulus. 



b. — Anterior tarsi of male dilated. Scutellum distinct. 



Body elongate Pholeuon. 



Body oval, convex Quaestus. 



B. — Anterior tarsi in both sexes four-jointed. 



Anterior tarsi slender Adelops. 



Anterior tarsi dilated Oryotus. 



In order that this table may be understood in the light of remarks 

 made further on, the following criticisms are suggested. 



It does not seem a valid procedure to separate as genera groups of 

 species in which the males have the anterior tarsi very feebly dilated 

 on the one hand or more dilated on the other. I would therefore 

 suggest the propriety of uniting Drimeotus with Pholeuon and Quaestus 

 with Quaesticulus. In these last two and Adelops, Schaufuss is entirely 

 in error. Abeille de Perrin informs us that " all the species of Adelops 

 known to him, more than eighty in number, have the anterior tarsi % 

 five-jointed, 9 four-jointed, except in three species," neither of which 

 is the type of Bathyscia. It is therefore evident that the two genera 

 established by Schaufuss belong to the eighty species above mentioned, 

 and as these do contain the typical species of Schioedte the name 

 Bathyscia must be adopted for them, and the name Adelops as used by 

 Schaufuss beeomes doubly erroneous and for the species there included 

 Abeille proposes the name Aphaobius. 



The next contribution of any extent to the knowledge of these 

 genera is contained in a '■ Liste generale des ArticuUs cavernicoles 

 de V Europe,^' by MM. Bedel and Simon, (Journal de Zoologie, Paris, 

 1875), from which I have been unable to obtain any ideas of the 

 limits of the genera. The paper is a useful list of species and 

 contains in a foot-note an intimation that the genera have need 

 of a revision. 



A more important though less extensive contribution, is that of 

 M. E. Abeille de Perrin, entitled " Notes sur les Leptodirites," (Bull. 

 Soc. Hist. Nat. Toulouse, 1878). In this I find the important state- 

 ment that his collection contains " more than eighty species of Adelops, 

 all of which have the anterior tarsi of the male five-jointed and in 

 the females four-jointed, excepting Milleri and two unnamed species 



