APPENDIX IV. 
DESCRIPTION OF THREE NEW SPECIES OF SIPHONAPTERA 
OBTAINED BY CAPT. H. E. M. DOUGLAS, V.C., D.S.O., R.A-M.C., ON THE CLARK EXPEDITION IN 
NORTH CHINA— 
BY THE HON. N. CHARLES ROTHSCHILD, M.A. F.L.S. 
HE collection of fleas contains three species, which all prove to be new. 
The most interesting of them is the one found on a roedeer. Its nearest 
ally is a flea which occurs in Turkestan on horses, cattle, etc., and does a 
great deal of damage. The types of the species are in the British Museum. 
1. Cevatophyllus subcaecatus spec. nov. (Fig. t and 2). 
3 2 The chief peculiarities of this species are the non-pigmented eye 
and the large eighth abdominal sternite of the ¢, which characters remove 
the species from true Ceratophyllus. There is, however, in that genus another 
species, C. silantiewt Wagner (1898), which is closely related to subcaecatus, 
although abundantly distinct. This C. silantiewi has the eye non-pigmented 
in the centre and its clasper is very similar to that of C. subcaecatus, the 
eighth sternite being small. The two species, however, may easily be 
distinguished by the shorter rostrum of subcaecatus, the pointed genal lobe, the 
very short bristles of the second segment of the antennae in both sexes (these 
bristles being long in the ? of stlantiewi), the smaller number of bristles on 
the abdomen and by other characters as well. 
Head.—Frons vertical from the tubercle downward, the latter a little 
nearer to the central sensory organ (pale dot) than to the oral corner. Eye 
round, very feebly pigmented, excepting the anterior and postero-inferior 
edges, at a certain focus appearing excised. A row of three large bristles 
before the eye, the central one slightly nearer to the lowest, in between these 
bristles some minute hairs, and in front of the row another row of three, the 
uppermost of which is placed close to the antennal groove in the ¢, and is 
absent in the @. Genal lobe more or less pointed. The occiput has one 
large bristle above the antennal groove before the centre, and a subapical row 
of 6 on each side, of which only the most ventral one is large. Along the 
194 
