244 



APPENDIX. 



by intelligent Portuguese there that death has sometimes been the result 

 of this fever. The anxiety my friends at Tete manifested to keep my 

 men out of the reach of the tampans of the village, made it evident that 

 they had seen cause to dread this insignificant insect. The only incon- 

 venience I afterwards suffered from this bite was the continuance of the 

 tingling sensation in the point bitten for about a week." Pp. 382-3. 



III. 



Note on the Acarus Scabiei. 



The figures of this insect given in the text do not represent the 

 two pairs of mandibles possessed by this creature so accurately as 

 they ought. I have therefore reproduced a drawing by Mr. 

 Hepworth, of Crofts Bank, near Manchester, published in the 

 fourth volume of the ' Quarterly Journal of Microscopical Science/ 

 Fig. 1 represents a magnified view of the entire creature, mag- 

 nified 65 diameters. 



Fig. 1. 



Fig. 2 is one of the mandibles of this creature, magnified 



Tig. 2. 



65 diameters. The mandibles of the whole family of Acarida 



