422 
Parasites of the Ground Squirrel 
examined. The presence of mites belonging to this family (the “Sar- 
coptides cysticoles” of Megnin) in the lungs and other tissues of birds 
has been known since Gerlach’s observations in 1859. An especial 
medical interest has been added to the family by the finding by 
Castellani of one species ((7. sarcoptoides Cast.) in the omentum of 
a negro {Centralhl. f. Bakt. Abt. 1. XLiii. p. 372). 
Fig. 10. 
We have not included in this paper the ectoparasites found by us on 
0. heecheyi. These consisted of different fleas, ticks, etc. Among the 
latter were two very interesting species, one being the common Derma- 
centor occidentalis Neum. and the other a new species Ixodes aequalis 
Banks {vide Entomological News, Nov. 1909, p. 276). It is to be hoped 
that the ground squirrel examined by us will be studied as carefully as 
the rat has been and to such a study we contribute the facts contained 
in this paper. 
