| 
SUBORDER MALLOPHAGA. 235 
Male.—Head rounded in front, slightly conic, transverse clear space behind clypeus; 
arntennze strong, third joint produced on anterior margin, forming small but rather 
sharp process; abdomen nirmoid; legs strong. 
Head elongate, slightly conic, widest behind antenne, front rounded, nearly par- 
abolic, the margins dense, a clear transverse band very distinct behind clypeus, one- 
third distance from tip to base of antennze, mandibles conspicuous between bases of 
antenne ; antenne strong, proximal joint enlarged, third joint slender, produced 
on anterior margin forming narrow rather acute process, distal joint longer than 
fourth, cylindric, 4 and 5 directed backward, being attached on caudad surface of 
third joint; eyes black, temporal lobes rounded narrowing caudad; occiput slightly 
emarginate; prothorax quadrate and widening slightly posteriorly; metathorax 
widening from prothorax to base of abdomen; anterior legs only about half as 
large as median pair, middle and hind legs large, cox not specially elongate but 
fairly elongate in hind pair; abdomen elongate ovate, widest segment behind the 
middle, with transverse brown bands, terminal segment scarcely notched, genital 
hooks slender. 
2 Length, 1.68 mm.; head, 0.48 mm.; abdomen, 0.98 mm. Width, head, 0.36 mm. ; 
abdomen, 0.47 mm. 
g Length, 1.64 mm.; head, 0.47 mm.; abdomen, 0.92 mm. Width, head, 0.34 mm. ; 
abdomen, 0.43 mm. 
This species, which is quite readily distinguished by the transverse 
clear space in the forehead, is represented by two females, one from 
Philohela minor and one from Bartramia longicauda and two males from 
Bartramia longicauda and one from Philohela minor, in the Burnett 
collection. 
Lipeurus subangusticeps Piaget. (PI. II, fig. g.) 
Les Pédiculines, p. 308, Pl. X XV, fig. 5. 
Male closely resembles the female in shape, but is somewhat smaller. The clypeus 
is slightly more pointed; the antenn:e have the first joint very long, about as long as 
all the rest together, second joint as long as the remaining joints; third joint very 
short but with a distinct process on the anterior margin; fourth and fifth joints 
equal; terminal segment very slightly notched; genital hooks very long and slender. 
$ Length, 3.26 mm.; head, 0.70 mm,; thorax, 0.56 mm,; abdomen, 2mm. Width, 
head, 0.30 mm.; abdomen, 0.33 mm. 
? Length, 4 mm. 
‘Described from one specimen in the Burnett collection, from Thallas- 
sidroma wilsont, which contains also several fine specimens of the female. 
Heretofore only the female seems to have been discovered, and the above 
description is given to complete the description of the species. Some 
slight differences seem to exist when compared with the descriptions 
of Denny and Piaget, but these are only varietal at most. 
Lipeurus densus Kellogg. 
New Mallophaga, p. 114, Pl. VII, figs. 1 and 2. 
On Diomedea albatrus, Monterey, Cal. (Kellogg). 
Lipeurus varius Kellogg. 
New Mallophaga, p. 116, Pl. VII, figs. 3 and 4. 
On Fulmarus glacialis glupischa and rodgersii, Monterey, Cal. (IKel- 
logg). 
Lipeurus celer Kellogg. 
New Mallophaga, p. 117, Pl. VII, figs. 5 and 6. 
On Fulmarus glacialis glupischa and rodgersii, Monterey, Cal. (Ixel- 
logg). 
