170 Mr. R. S. BagiKiU on some 



colour as the body, tinged with dull rufous only on the 

 forearm above the knees ; hind legs similar, but witli rufous 

 tinge on back of legs above hocks and between the hocks 

 and fetlocks ; superciliary streaks and sides of face pale 

 grcvish brown ; underparts pale greyish brown ; throat and 

 inside thighs white. 



Hab. Chirinda Forest, Mclsetter, Rhodesia. 



7'ype. Adult female skin, H.M. no. 8.7.19.36. Collected 

 by C. P. M. Surgmerton, Esq. 



The writer considers these characters of slight variations 

 of colour and size to be of local and family value only, 

 always likely to arise where animals by environment 

 and habit are confined in widely-separated patches of 

 country. Such as these little forest duikers probably never 

 move more than a few miles from their birth-place, and 

 keep within the limits of restricted and isolated belts or 

 patches of dense bush or forest, where conditions are scarcely 

 affected by change of season, and the plants on which they 

 live are always present in abundance. 



These conditions would encourage in-and-in breeding, pro- 

 ducing an infinite variety of races in which small changes 

 of size and colour would tend to become fixed characters. 



Possibly in the great forest-tracts of Central Africa a 

 greater individual variation would be apparent, but south of 

 that region there are no great areas of forest, but only 

 isolated belts and patches occurring here and there along 

 the courses of rivers, or in mountain-ranges, or on the coast, 

 at wide intervals, each possessing a local race stamped with 

 its individual trait. 



XVI. — On some neio and rare British Di/dopods. 

 By Richard S. Bagnall, F.R.S.E., F.L.S. 



It is desirable to make the following records, Leptoiulns 

 helai'cHs and Mastigonodesmns honcii being additions to the 

 British fauna, whilst Isolates sp. woubl seem to indicate, 

 from observations in the field, a new species. 



I regret that, living in hotels, away from my litcralur', 

 specimens, and aj)pliance8, it is impossible to make any useful 

 descriptions or remarks. 



LejJtoi'nlus hehjicus (Lalz.). 

 A graceful Julid, with a single white dorsal line and pale 



