NO. 12 NEW INSECTIVORES FROM AFRICA— HELLER 5 



about twice the size of the second which is scarcely twice the size 

 of the fourth. The species is closely related to lixa of Nyasaland 

 and rather distantly to the large leucura which occurs on Zanzibar 

 Island and on the coast at Lamu and Witu. 



PACHYURA INFINITESIMA, new species 

 Pygmy Pachyura 



Type from Rumruti, Laikipia Plateau, British East Africa ; alti- 

 tude 7,000 ft.; adult male; No. 1 1.4.6.5, Brit. Mus. ; collected by 

 Robin Kemp, October 27, 1910 ; original number, 1431. 



Characters. — Most closely allied to nanilla of South Africa, but 

 size considerably smaller and color of upper parts broccoli-brown, 

 not variegated-gray; fourth upper unicuspid large, one-third size of 

 second and placed in tooth row, there being a slight diastema be- 

 tween it and the following tooth ; second unicuspid only about one- 

 half size of third; relative sizes of unicuspids agreeing with nanilla. 



Coloration. — Dorsal color uniform broccoli-brown, underparts 

 much lighter silvery, gray 10 of Ridgway, fairly sharply defined on 

 sides; hair everywhere plumbeous at base, except on chin where it 

 is white to the roots ; position of lateral glands marked by a con- 

 spicuous patch of white hair ; feet white ; ears and tail dorsally 

 broccoli-brown, the underside of the latter whitish for the basal 

 one-half. 



Measurements. — Head and body, 57.5 mm. ; tail, 26 ; hind foot, 



8.5. 



Skull : Condylo-incisive length, 14.5 ; breadth of brain-case, 6.5 ; 

 length of upper tooth row, 5.8; condylo-incisive length of mandible, 

 8.9; depth at coronoid process, 3.8. 



Type unique. This species is somewhat smaller than nanilla and 

 is the smallest African race, but is less minute than madagascarensis. 

 Crocidura nanilla, which resembles this species in size and color, is 

 a true Crocidura. The fourth unicuspid, which the type skull shows 

 on its right side, is a mere compressed ridge of dentine crowded in 

 between the third unicuspid and the large premolar and has no re- 

 semblance to the low circular cuspid tooth of Pachyura which repre- 

 sents the fourth upper unicuspid. The left side of nanilla lacks any 

 adventitious tooth of this sort and is of the normal Crocidura type. 

 In nanilla the third unicuspid is scarcely larger than the second 

 while in Pachyura this tooth is usually double the size of the second. 

 There is in the collection among a large series of Crocidura 

 suahelce one specimen which shows a similar compressed ridge-like 



