98 Psyche [August 



collecting wherever any doubt arises. There is the further dis- 

 advantage that large skins are usually carefully cleaned when they 

 are tanned and all the parasites are necessarily lost, but undoubt- 

 edly assiduous collecting in our museums will add greatly to our 

 knowledge of the Anoplura and jNIallophaga. 



The mammals which were examined without finding parasites 

 should be recorded as well as those from which parasites were 

 taken. About fifteen fresh specimens of Ochotona albata (cony, 

 rock rabbit or pika) and several skins of this and a related species, 

 Ochotona schisiiceps, were examined with negative results. The 

 finding of Anoplura upon members of this genus would be of much 

 interest since these animals are the nearest relatives of the rabbits 

 and it is to be expected that their parasites should be related to the 

 parasites of the rabbits. 



Several specimens of Aplodontia calif ornica were examined, also 

 with negative results. It seems probable that the members of this 

 genus harbor no Anoplura or Mallophaga since the author has 

 previously examined a number of specimens with the same result. 

 The examination of a few fresh specimens and many skins of 

 moles of the genus Scapanus failed to produce any parasites al- 

 though an Anopluran species is accredited to the eastern moles of 

 the genus Scalopus. Nor was anything found upon any shrews, 

 although numerous individuals of two or three species of Sorex 

 and Neosorex were examined. 



The descriptions of new species and notes on old species follow: 



Mallophaga. 

 Trichodectes retusus Nitzsch. 



Numerous specimens from two individuals of Maries sp?, the 

 Pine Marten, a single specimen from Gulo luscus ssp?, a wolverine 

 (all taken at Lyell Canyon, Mariposa Co., Calif.) and a single 

 immature specimen from a skin of Mustela vison nesolestes (Ad- 

 miralty Is., Alaska). 



This species was originally described from an Old World weasel 

 and has been reported from mink and weasel in North America. 

 It is distinguished from the other Mustelid-infesting species of 

 Trichodectes by the fact that the antennae are similar in male and 

 female. 



