90 HON. N. CHAKLPJS KOTHSCHILD-r-A SYNOPSIS OF 



1. Genus Dermatophilus^ Giier. 



Two species are known. Pregnant ? is much swollen and rounds like a 

 small pea. 



1. D. penetrans, L. Eye distinct. Head and thorax of pregnant ? outside 

 the swollen abdomen. — This is the common Chigoe or Jigger, which is a 

 native o£ South America, but has been introduced into Africa. 



2. D. caecata, Enderl. Eye vestigial. Head and thorax of pregnant ? 

 completely covered by the abdomen and lying in a cavity formed by the 

 latter (fig. 3). Male unknown. — The species has been taken in Brazil on 

 and behind the ears of Mus rattus. 



2. Genus Hectopsylla, Frauenf. 



This genus has not been found on rats or mice. It was originally confined 

 to America, but one species has been introduced into aviaries in Europe. 



3. Genus Echidnophaga, Olliff. 



The genus belongs to warm countries in the eastern hemisphere. Numerous 

 species are known, four of which have been found on rats. 



Key to the Species. 



a. Fifth tarsal segment with three heavy bristles, one small one and a thin 

 long subapical hair on each side (fig. 4). 



1. E. gallinaceus, Westw. Fifth tarsal segment with two ventral apical 

 ])ristles (as in fig. 5) ; hind edge of head wdth a lateral lobe (fig. 1). — A 

 common species, particularly on the heads of fowls, in tropical Asia and 

 Africa ; introduced into the United States. Also found on rats in Africa. 



2. E. myrmecobii, Rothsch. Fifth tarsal segment with one ventral apical 

 bristle (as in fig. 4); hind edge of head with a lateral lobe. — Belongs to 

 Australia,, where it has been taken on several indigenous animals and also 

 on rats. 



3. E. murina, Tirab. Fifth tarsal segment with one ventral apical bristle 

 (fig. 4); hind edge of head without distinct lateral lobe. — A native of southern 

 and south-eastern Europe, where it occurs on the heads of rats ; it is appa- 

 rently rare. 



