SUBORDER MALLOPHAGA. 237 
Trichodectes subrostratus Nitzsch. 
Germar's Mag., Vol. III, p. 296; Gebel, Zeitschr., Vol. XVII, p. 88, Pl. I, figs. 4,5, and6; Gurlt, Vol. 
IX, p.6; Giebel. Epiz.. p. 55. Pl. ITI, fig. 5; Piaget, p. 389, Pl. XX XI, fig. 9; Osborn, Bull. 7. 
Div. Ent , Dept. Agr.. p. 42. fig. 31. 
The common louse affecting domestic cats, often abundant. I have 
specimens from the Fitch and various other American collections. 
Trichodectes retusus Nitzsch. 
Pediculus mustele Schrank. 
Trichodectes retusus Nitzsch, Germar's Mag., Vol. III. p. 296. 
Trichodectes dubius Nitzsch, Germar’s Mag., Vol. III, p. 296. 
Trichodectes dubius Denny, p. 190, Pl. X VII, fig. 2. 
Trichodectes retusus Giebel, p. 55, Pl. ITI, fig. 4. 
Trichodectes pusillus Giebel, p. 55, Pl. IIT, fig. 4. 
Trichodectes retusus Piaget, p. 387, Pl. XX XI, fig. 8. 
Collected from a weasel at Ames, lowa, July, 1883. 
Specimens evidently belonging here and taken from the mink have 
been examined in collections from Professor Bruner and Professor 
Comstock. in the Bruner collection there 1s a very fine series of 
females which agree closely with descriptions and figures by Piaget, 
but, unfortunately, there appear to be no mature males. A single 
mature male in the Cornell collection, however, agrees with the male 
from the weasel, and I therefore feel little hesitancy in referring all to 
retusus. 
Trichodectes crassus Nitzsch. 
I have referred here, with some hesitation, a specimen from the rac- 
coon (Procyon lotor) (Burnett collection.) The specimen was not in 
condition for absolute identification. 
Trichodectes climax Nitzsch. 
Trichodectes climax Nitzsch, Germar’s Mag., Vol. III, p. 296; Gervais, Vol. IIT, p. 313, pl. 48, 
fig. 3; Giebel, Zeitschr., Vol. XVII, p. 81, pl. 1, figs. 1 and 2; Giebel, Epiz., p. 58, pl. XX, 
fig. 2. 
Trichodectes capre Gurlt, Vol. IX, p. 3, Pl. I, fig. 2; Packard's Guide, p. 555. 
Trichodectes climax Piaget. p. 391, Pl. XXXII, fig. 1; Curtice, Anim. Par. Skeep, Bur. Animal 
Industry, Dept. Agr., p. 30, Pl. VI; Osborn, Bull. 7, Div. Ent., Dept. Agr., p. 44. 
Infests the common goat. Specimens in Hassall collection, collected 
at Baltimore 1891. This and the following one are very simular. 
Trichodectes limbatus Gervais. 
Trichodectes limbatus Gervais, Aptera, Vol. III, p. 313, Pl. VII, fig. 1; Giebel, Epiz., p. 57; 
Piaget, Les Pédic., p. 395. 
Trichodectes climax var. major Piaget, Les Pédic.. Suppl p 86 Pl. IX, fig. 5 
Trichodectes limbatus Curtice, Anim. Par. Sheep, Bur Animal Industry, Dept. Agr. p 49, 
Pl. VI; Osborn, Bull. 7, Div. Ent., Dept. Agr., p. 44 
This form so closely resembles the climax that it has been a question 
whether it is entitled to specific rank. Specimens in Hassall collection 
taken at Baltimore in 1891. (See figure, ante.) 
Trichodectes sphzrocephalus Nitzsch. 
Figured Redi, Pl. 22. 
Pediculus ovis Linné, Syst. Nat. II, p 1017; Schrank, p. 502, Pl. I, figs. 8 and 9. 
Trichodectes spheerocephalus Nitzsch, Germar s Mag., Vol. 111, 296. Denny, p. 193, Pl. XVII, fig. 4; 
Gurlt, Vol. IX, p.5; Giebel, Epiz., p. 60; Piaget, p. 393, PJ. XX XII, fig. 2; Curtice, Anim. 
Par. Sheep, Bur. Animal Industry, Dept. Agr., p. 45, Pl. V; Osborn, Bull. 7, Div. Ent., p. 45. 
A rather common parasite on sheep, though seldom in great numbers. 
Specimens in H. O. collection from Canada and Iowa. Has been quite 
common on sheep at Ames, winter of 1895-6. 
