90 Psyche [June 
A NEW TRICHODECTES FROM BAJA CALIFORNIA. 
By V. L. Kettoce anp S. NaKayaMa, 
Stanford University, Cal. 
Among some old specimens of Mallophaga in the Stanford Uni- 
versity collection we have found a male and a female of an inter- 
esting new species of Trichodectes, which is described herewith. 
The specimens were collected by the well-known ornithologist, 
R. C. McGregor, in a bird-collecting expedition to the islands off 
Baja California (San Martin, Cerros, Todos Santos, San Ger- 
onimo, Guadaloupe, and others). No parasites of mammals were, 
as far as the records show, obtained, and the specimens referred 
to in this paper were credited to bird hosts, the male to a Corvus 
semicinctus from Cerros Island and the female to Hematopus 
frazari from San Martin Island. There is undoubtedly error in 
these attributions, either in the record-keeping or by abnormal 
straggling in game bag or on skinning table from some mammal 
to these birds. The host is, therefore, unknown. The specimens 
are typical Trichodectes (mammal-infesting parasites), and cer- 
tainly of the same species. 
The new species suggests, in general shape of head, length and 
character of antennz, the semi-dentate lateral margin of abdomen, 
and terminal segments of the male, the wide-spread and familiar 
Trichodectes limbatus of the goat; but the specific differences are 
marked. Especially is the new species distinguished by the shape 
of the abdomen, and great length of the tarsal claws. The abdo- 
men of the male, in the new species, is as broad as long, almost 
roughly circular in outline, indeed, while in limbatus, it is elongate 
ovate. Also the posterior margin of the second abdominal seg- 
ment bends conspicuously forward at its middle, revealing thus a 
broad but deep rounding posterior emargination in this segment. 
Thus the abdominal characters alone conspicuously distinguish 
this new species from any other known Trichodectes. 
Trichodectes painei sp. nov. (fig. 1, A-D). 
Male: Body, length 1.21 mm.; width (across third abdominal segment), .60 
mm.; general color, pale yellowish brown with darker bands and markings on head 
and thorax, and pronounced, although narrow, dark lateral margins of abdomen, 
