A revised Classification of the Otomjinse. 203 



Foenus bicarinatus , sp. n. 



$ . Nigra ; mandibulis basi, pedibusqiie anticis fusco-ferrugineis ; 

 tibiis anticis intermediisque supra, tarsis anticis interraediisqiie 

 apice infuscatis, tarsisque posticis, metatarsi tertio basali arti- 

 culoque quinto exceptis, albidis ; terebra rufo-testacea abdomine 

 paullo longiore, valvvilis apice flavidulis et dilatatis. 

 Long. 22 mm. ; terebrae long. 15 mm, 



? . Head not very strongly narrowed behind the eyes, 

 slightly swollen transversely behind the ocelli, opaque and 

 coriaceous, the hind margin distinctly cariuated. Eyes 

 separated from the hind margin of the head by a distance 

 equal to nearly half their own length; posterior ocelli in a 

 line with the summit of the eyes, twice as far from each 

 other as from the eyes. Cheeks half as long again as the 

 first joint of the flagellum, a longitudinal carina between the 

 antennae, the front depressed on each side above the base of 

 the antennae; second joint of the flagellum twice as long 

 as the first, third more than half as long again as the first 

 and second combined. Neck rather short; angles of the 

 pronotum almost unarmed. Mesonotum irregularly trans- 

 versely rugose-striate ; with two longitudinal carinas from 

 near the middle of the anterior margin not reaching the 

 middle of the prsescutum, the space between the carinee 

 transversely striated and deeply depressed. Pleurae rugose ; 

 median segment rather coarsely rugose, convex, with a 

 longitudinal carina, the sides of the segment above the hind 

 coxae with a few coarse striae. Hind coxae shining, rather 

 indistinctly transversely striated. Hind metatarsus as long 

 as the four apical tarsal joints combined. Radius sharply 

 bent upwards towards the costa at about two-thirds from 

 the base, as in breviscutum and other allied species. 



Hab. Swan River, Western Australia. 



Easily distinguished by the strong carinae on the 

 mesonotum. 



XXI. — A revised Classification of the Otomyinae, with 

 Descriptions of new Genera and Species. By Oldfield 

 Thomas. 



(Published by permission of the Trustees of the British Museum.) 



The very striking cranial and dental characters found 

 among the different species of what has hitherto been con- 

 sidered the single genus Otomys, have long seemed to indicate 

 that some subdivision of the genus would be advisable. 



