REVISION OF THE SARCOPSYLUDAE 71 
between the fourth and fifth abdominal segments forms a black ring which encircles, 
as a kind of wall, an anal cavity in which lie the last six segments. The legs are 
much less slender than in penetrans, and the fifth tarsal segment bears five or six 
bristles on each side according to Enderlein. 
Dr. Enderlein found seventeen specimens of this species in the skin 
behind the ears of a specimen of Mus rattus, which was collected by C. Nehring, at 
Piracicaba, Sao Paulo, Brazil. Enderl fin's figure 1 is a reproduction of a photo- 
graph of the head of the host, the picture showing the parasites in situ. We have 
received two specimens in exchange from Dr. Enderlein and the Berlin Museum 
both specimens lacking the legs. 
Fig. G 
The insect recorded by Biandford in Ent. Mo. Mag. XXX. p. 228 (1894) 
from China as being D. penetrans or an allied form may be a species ot Echianovhaga _ 
The specimens, we hear, have unfortunately been mislaid or accidentally destroyed. 
