130 



IXSECTIVORA 



ERINACEUS ALGIRUS Duvernoy and Lereboullet. 



(Synon3-my under subspecies.) 



Gcogrupliical distrihution. — Northern Africa ; also in southern 

 Spain, southern France, and the Balearic Islands. 



Diagnosis. — Smaller than Erinaceiis europsens (hind foot less 

 than 40 mm.) : sjiines not so coarse ; middle of forehead with 

 bare area, among the spines ; skull with sagittal crest extending 

 forward to middle of frontal : a wide flattened area on each side 

 of bony palate behind transverse ridge ; third upper incisor with 

 two perfectly distinct roots ; elevated poi'tion of posteiior lower 

 premolar with only two cusps (fig. 2b h). 



External characters. — Externally Erinaceus alijlnis is dis- 

 tinguishable from E. eurofseus by its smaller size, shorter, more 

 slender and apparently more densely-set bristles, and by the bare 

 area at middle of forehead. This bare area is about 7 mm. wide 

 and extends back about 10 to 15 mm. from front line of spines. 

 In dried skins it is sometimes partly hidden by shrinking. Fur 

 more dense and less coarse than in the larger animal. Claws on 

 front feet seldom attaining a length of 8 mm. 



Colour. — The colour resembles in general that of the paler 

 races of E. euro^setis. 



Slull. — The form of the skull is essentially as in E. i nropseus 

 except that rostrum is less elevated posteriorly, so that the dorsal 

 profile tends to become slightly concave. Sagittal crest when 

 fully developed extencUng forward to middle of frontal, while in 

 E. eiiropseiis it is usually confined to parietals, rarely encroaching 

 on posterior edge of frontal. Ridge at margin of orbit veiy short, 

 scarcely more than a process above lachrymal foramen. Bony 

 palate extending behind transverse ridge as a M-ell-defined Hat area 

 divided along median suture by a longitudinal ridge representing 

 the median spine of E. europaeus. Basisjahenoid pit narrower, 

 relatively deeper, and with more overhanging edges than in 

 E. enropsetis. 



Teeth. — In general the teeth show no departure from those 

 of E. curopstus. The posterior lowei' pie- 

 molar, however, lacks all trace of the meta- 

 conid, so that the resemblance of the elevated 

 portion of the tooth to the first triangle .of 

 iH^ and 7/(.j is completely destroyed. In the 

 upper jaw the third incisor, canine, and 

 a h first premolar are two-iooted, apparenth' 



i'lG. 25. without exception. 



Large lower premolar of Measurements. — Head and body about 



a.uiE.^aigiru!fh).'^i^l 200 to 250 ; tail, 25 to 40 : hind foot, 32 to 

 37 ; condylobasal length of skull, 54 to 59 mm. 

 Ilemarlcs. — This species is readily distinguishable from £v/«ace;f*" 

 europ»U8 by the bare spot among spines of forehead, the perfectly 

 two-cusped large lower premolar', and the t^\"0-rooted third upper 



