aca Ta maa a a a a ae 
238 INSECTS AFFECTING DOMESTIC ANIMALS. 
Trichodectes scalaris Nitzsch. 
Pediculus bovis Linné, Syst. Nat., Il, p. 1017; tawri Linné, Faun. Suec., p. 1946; tawri Fab., Spec. 
Ims;, Wole Wipe 4iit. : 
Trichodectes scalaris Nitzsch, Germar’s Mag., Vol. III, p. 296; Denny, p. 191, Pl. XVII, fig. 9; 
Giebel, p. 61, Pl. III, figs. 7 and 9; Piaget, p. 396, Pl. XX XIIJ, fig. 2. 
A very common parasite on domestic cattle, and I have seen speci- 
mens in a number of collections. Although there can be little doubt 
that Linnzeus referred to this form in his descriptions of P. bovis and 
P. tauri, the mistaken generic reference and the indefiniteness of his 
description may be reason to give Nitzsch’s name the precedence, and 
I have followed all modern authors in so referring it. 
Jaa 
/ 1 Ve 
2 IE i ls rr aN 7} 
; So ee ee a 
> if ‘ STE WUD 
LOCI 1 ee , vv Lee 
a aa OTE Ptr tr ety \ VV A N 
ee se i 
rit} ¥ - z 
> Oe, 1 . eyes 
Fig. 145.—Trichodectes setosus: a, terminal segments of male; b, female—enlarged (original). 
Trichodectes parumpilosus Piaget. 
Trichodectes equi Denny, p. 191, Pl. XVII, fig. 7. 
Trichodectes parumpilosus Piaget, p. 397, Pl. XXXII, fig. 5. 
Trichodectes parumpilosus Osborn, Bull. 7, Div. Ent., Dept. Agr., p. 46, fig. 35. 
This species is the common one of horses in this country, and is the 
one which in English and American works generally, since Denny’s 
monograph, has been known as Trichodectes equi. 
Specimens collected abundantly at Ames, Iowa, and I have deter- 
mined it in a number of collections. 
