216 INSECTS AFFECTING DOMESTIC ANIMALS. 
Gyropus ovalis Nitzsch. 
This is a form closely related to the preceding species, and observed 
and described by Nitzsch at the same time. It differs from that species 
in the much shorter and broader body, and is, according to Denny, 
“pale yellow-white; head and thorax bright ferruginous, the former 
transverse; temporal lobes produced; abdomen large, nearly orbicular; 
legs thick, the two posterior pairs curved; ungues long, curved, and 
strong.” Collected at Baltimore by Dr. A. Hassall. 
The scanty hair of the guinea pig makes the application of washes 
for the destruction of the lice a very simple matter, so that wherever 
it is a matter of importance there need be no difficulty in ridding the 
animals of the parasites. 
APPENDIX TO MALLOPHAGA. 
List of the species of Mallophaga recognized as belonging to the fauna of 
the United States, with descriptions of new species. | 
Family PHID@GPTERAD AL 
Docophorus platystomus N. 
Burmeister, Handbuch, Vol. II, p. 426, sp. 13; Denny, p. 108, Pl. IV, fig. 7; Giebel, Epiz., p. 69, 
Taf. UX, fig. 5; Piaget, p. 17, Pl. 2, Fig. 1. 
From sharp-shinned hawk (Accipiter velox), Rhode Island (H. C. 
Bumpus), Buteo swainsonit, lowa(?)(H.O. collection.) . Aquila imperialis 
(Burnett collection). 
Docophorus cursor N. 
Burmeister, Handbuch, Vol. II, p.426, sp. 14; Denny, p.101, Pl. II, Fig. I; Giebel, p.75, Taf. X, 
figs. 5 and 6; Piaget, p. 24, Pl. I, fig. 5. 
From Asio wilsonianus, Ames, Iowa. Lincoln, Nebr. (Bruner). 
Docophorus ceblebrachys N. 
Denny, p. 92, Pl. I, fig. 3; Nitzsch MSS., Vol. IV, p. 197 (cited by Denny), and Zeits. fiir Natur., 
1861, Vol. XVII, 528; Giebel, p. 77, Taf. XI, fig. 15; Piaget, p. 29, Pi. I, fig. 8. 
From snowy owl, Iowa (H. O. collection; Cassino collection), Arctic 
Am. (Stejneger collection and McKay collection). Also specimens in 
Nat. Mus., Ace. No. 16827, and in Riley collection. It occurs very 
abundantly on this bird, but so far there is no record of its occurrence 
on any other species. 
Docophorus superciliosus N. 
Burmeister, Handbuch, Vol. 11, p. 427, sp. 22; Denny, p. 68, Pl. III, fig. 9; Giebel, p.94, Taf. X, 
fig. 3; Piaget, p. 39, Pl. III, fig. 1. 
From hairy woodpecker (Dryobates villosus) (Cassino collection). 
Docophorus communis N. 
Nitzsch, Germar’s Mag., Vol. III, p. 920 (290) (vide Giebel); Burmeister, Handbuch, Vol. II, 
p. 425, sp. 9; Denny, p. 70, Pl. V, fig. 10; Giebel, p. 85, Taf. XI, fig. 13; Piaget, p. 54, Pl. IV, 
fig. 5. ' 
From Lanius borealis, Ames, lowa. Shore lark Cassino collection). 
