158 



PROCEEDINGS OF THE ACADEMY OF 



[1894. 



which the profile is interrupted by iuterorbital and parietal swellings. 

 In aquaticiis the last three molars average as wide as long, in parvuti 

 much wider than long, owing to the greater relative intrusion of their 

 inner anterior cusps. In aquatic as the first premolar, owing to sudden 

 constriction of the rostrum at that point, is thrown within the line con- 

 necting the canine and second premolar; in irarvifs these three teeth are 

 in regular file. Mandibular dentition in parvus relatively wider for 

 length throughout, and the outline of teeth more angular than in uqaa- 

 ticus; the hinder section of last molar in parvus is less than half the 

 width of anterior section; in aqaaticm the sections of this tooth are of 

 equal width and its greatest length exceeds considerably its greatest 

 width, while in parvus the transverse diameter equals the longitudinal. 

 In the latter the mandibular ramus, as in the case of Patorius penin- 

 sulct, while much shorter, is absolutely heavier and wider. 



There is a strong projecting shoulder at the anterior base of coronoid 

 process in parvus not seen in aquaticus, and the accessory posterior spur 

 just below tip of coronoid process in the latter is not present in the 

 former. The measurements are as follows : — 



One specimen of this genus has been received from Mr. Dickinson. 

 It is an adult, with teeth well worn, showing well marked specific 

 characters to distinguish it from *S'. aquaticus and its closely allied 

 forms, argentatus and australis.^ 



11. Sciurus niger Linn. Soutlicrn Fox Squirrel. 



All of the thirteen specimens received are remarkably uniform in 

 color for so variable a species, being of the light gray type, with 

 black crown, white ears and nose patch and tawny underparts. One 

 short tailed specimen is blacker on feet and legs, the belly rusty. 



^Scalops aquaticus auslralis Chapman, Bull. Amer. Mus. N. H., 1893 

 Art. XXI. 



