244 MESSRS. C. J. GAHAX AND Q. J. AREOW ON THE [NoV. 3, 



Skull stout and strong, with broadly spread zygomatic arches, 

 expanded nasals, well developed postorbital processes, and broad 

 interorbital region. Palatal vacuities about normal, opposite the 

 first three molariform teeth. 



Middle upper premolar about equal to the posterior; middle 

 lower one rather larger than that behind it. Molars large, as in 

 M. cinerea, markedly larger than in M. regina. 



Dimensions of the type, an old male, measured in the flesh : — 



Head and body 180 mm. ; tail 195 ; hind foot (s. u.) 27 ; ear 31. 



Skull — greatest length 45-8 mm. ; basal length 42-1 ; zygomatic 

 breadth 26-6; nasals, length 20-7, greatest breadth 6-8, least 

 breadth 3-2 ; interorbital breadth 8-2 ; breadth across postorbital 

 processes lO'l ; breadth of brain-case 16; palate length 25; 

 length of three anterior molariform teeth 7 '8. 



Marmosa constantice is larger, paler, and has a shorter tail 

 than M. cinerea, its nearest ally, with which it shares the 

 characteristic shape of skull and nasals. The Bogota M. regina 

 Thos. has a narrower skull, less expanded nasals, and unicolor 

 tail. 



I have named this pretty species in honour of the donor of the 

 present most valuable accession to the National Collection, in 

 recognition of her enlightened method of commemorating her late 

 husband's memory. 



EXPLANATION OF PLATE XXVII. 



Canis sladeni, sp. n., p. 235. 



3. List of the Coleoptera collected by Mr. A. Robert at 

 Ohapada, Matto Grosso (Percy Sladen Expedition to 

 Central Brazil). By C. J. Gahan, M.A., and G. J. 

 Arrow. 



[Received August 18, 1903.] 



(Plate XXYIII.*) 



In this collection the Lamellicornia, Longicornia, and Ph}i:o- 

 phaga are especially well represented ; but, since our knowledge of 

 the coleopterous fauna of Brazil is mainly confined to more 

 northern regions, the whole collection, which contains specimens 

 of 175 species, forms a valuable contribution to the materials avail- 

 able for the study of the distribution of South American insects. 

 New species of Lamellicornia, Rhynchophora, Heteromera, Longi- 

 cornia, and Phytophaga are described, and there are in addition 

 others which, for want of sufficient specimens or other reasons, 

 it is not advisable at present to describe. The earlier groups, as 

 far as and including the Rhynchophora, have been dealt with by 

 Mr. Arrow, while for the remainder Mr. Gahan is responsible. 



* For explanation of tlie Plate, see p. 258. 



