1922] Allen, Congo Collection oj Insectiwra 37 



alveolar border. At this stage (represented by No. 49499) the four incisi- 

 form teeth are still unchanged, but the tip of the caniniform p 3 is just 

 above the alveolar plane, or practically at the same stage as mi. At the 

 next stage (represented b} T No. 49498, Fig. 1, Stage 4), nil is about two- 

 thirds grown but not as yet at full height, and pi is evenly keeping pace with 

 it in development. None of the other milk teeth shows any indication of 

 approaching replacement. In skull No. 49428 this molar is fulty de- 

 veloped, as is also pi, but the milk premolars (p 2 , P3, P4) are still firmly in 

 place, with no trace of their successors between their roots. The first 

 incisor (ii), however, has been renewed, and the crowns of the successors 

 of is and i3 can be seen pushing up at their inner bases, and the same 

 condition is also true of the canine. It would seem, therefore, that the 

 renewal of the milk incisiform series just precedes that of the milk pre- 

 molars. In No. 49484 a somewhat later stage is shown, in which mi is 

 not only fully mature but the crown of m 2 has reached about one-half its 

 full height. In this skull (Fig. 1, Stage 5) the permanent canine has attain- 

 ed to about half the height of its predecessor, coming up at its outside base, 

 and the crowns of the milk premolars can be seen between their roots, 

 these four teeth, like the same teeth in the maxillary series, developing 

 coincidehtly. The permanent incisors and the permanent canine are also 

 now fully matured. 



To complete the series of illustrations a figure of the unworn denti- 

 tion of a youngish adult (Fig. 1, Stage 7) and of an old-age adult (Fig. 

 1, Stage 8) are here included. 



Nasilio fuscipes (Thomas) 

 Macroscelides fuscipes Thomas, 1894, Ann. Mag. Nat. Hist,, (6) XIII, January, 

 p. 68. "N'doruma [Doruma], Niam-Niam country (about 5° N. and 27° 30' E.)." 

 Based on a young female "having still its milk-dentition in place." 



Represented by 30 specimens (28 skins and skulls, 2 in alcohol), col- 

 lected as follows : 



Niangara, 8: November 18-December 19, 1910. 



Faradje, 21: February 8, 1910; February 20-May 6 (mostly Feb- 

 ruary 2-March 1), 1911; December 25, 1912; January 3-8, 1913. 



Garamba, 1 (in alcohol) : March 1912. 



Males and females are equally represented. All are adult except 9, 

 which are one-half to two-thirds grown, with the permanent dentition 

 incomplete. These form a series showing all the stages of change from the 

 deciduous to the permanent dentition, confirming Thomas's determina- 

 tion of the dental formula in Macroscelides. 1 



'1890, Proc. Zool. Soc. London, pp. 445, 446. Milk dentition of Petrodromus figured, p. 445. 



