. 
SUBORDER MALLOPHAGA. 239 
Trichodectes pilosus Giebel. 
Pediculus equi Linné, Syst. Nat. II, p.1018; Gurlt, Vol. IX, p.5 (vide Piaget). 
Trichodectes pilosus Giebel, Zeitschr. f. ges. Naturwissensch., 1861, Vol. X VII, p. 86; Giebel, Epiz., 
p. 59; Piaget, p. 395, Pl. XX VII, fig. 4; Osborn, Bull.7, Div. Ent., Dept. Agr., p. 45, fig. 34. 
Piaget holds that this is the form originally described as Pediculus 
equi by Linnzeus, but retains the name proposed by Giebel. He records 
it as occurring on both Equus caballus and Equus asinus. Lam not 
aware of any record of actual occurrence of this form in this country, 
but it should be found on donkeys and horses, and it seems proper to 
include it with such statement. 
Trichodectes setosus Giebel. 
Collected from porcupine (Hrethizon dorsatum) by Prof. Lawrence 
Bruner, Lincoln, Nebr. 
Trichodectes geomydis Osborn. 
Bull. 7, Div. Ent., Dept. Agr., p. 54, fig. 42. 
A very common and abundant species on the pocket gopher (Geomys 
bursarius), and I have examined specimens in the 
Cassino collection from Thomomys. Also from 7. 
botte, from California, in Johnson collection. 
The original notice and description are as follows: 
Related to the Trichodectes infesting the larger 
mammals is a species which has been taken in im- 
mense numbers from the pocket gopher (Geomys bur- 
sarius), at Ames, Iowa. It was first taken in 1883, 
and since then has been collected from a great num- 
ber of individuals, and I have also seen specimens 
taken from the western gopher, Thomomys, in a col- 
; d ; Fie. 146. — Trichodectes 
lection of parasites kindly loaned me by Mr. 8S. E. = geomydis—enlargea 
Passino (author's illustration). 
Body robust and rather hairy. Antenn very long, the basal segment enlarged, 
the head with a deep semicircular incision in front. 
The head is rather wider than long and the antennx are situated somewhat pos- 
terior to the middle and usually directed backward, very large and long, the joints 
nearly equal in length, but the basal are much enlarged in the male. Head with a 
deep semicircular incision on the otherwise semicircular anterior border, the posterior 
border slightly trilobed. Thorax short and broad; suture distinct; abdomen ovate, 
tapering regularly and rapidly to the anal segment. Genital apparatus of male 
distinct. The hairs are distributed evenly over border of head and sides of body; 
four central segments of abdomen with transverse rows of stronger hairs or weak 
spines, and the lateral posterior angles of all segments but the first with long 
bristles. Length, 1 mm. 
The antenne in male and the deep frontal incision separate this from 
any species known to me, and I think there is no question as to its 
being a distinct species. 
