182 University of California Publications in Zoology [Vou. 23 
legs, and on under parts, becoming bluish white on sternum. Flagella of antennae 
transparent claret color. Larger scale-like projections of rugae on anterior portion 
of carapace and chelipeds spotted with brick red, the two to three spots of red 
to each of the scales on the carapace giving it an apparently tuberculated appear- 
ance. Hairs yellowish. A few scattered spots of brick-red occur on the first 
few abdominal segments. 
Type Locality.—San Clemente Island, California (H. N. Lowe). 
Distribution.—There are specimens in the United States National Museum 
from Monterey, Santa Monica, and San Pedro bays, and Santa Rosa, San Clemente, 
and Santa Catalina islands. I have also seen a specimen collected at Laguna Beach 
by Prof. W. A. Hilton of Pomona College. 
Remarks.—This species has been named in honor and appreciation of Dr. Mary 
J. Rathbun, associate in zoology of the Smithsonian Institution. 
Ia general appearance and coloration it resembles P. agassizii Faxon (Bull. 
Mus. Comp. Zool., 24, 174, 1893; Mem. Mus. Comp. Zool., 18, 69, pl. 15, fig. 1, 
1895), but it is readily distinguishable in that it lacks the three teeth which are 
so prominent on the anterior border of the carpus of the chelipeds of that species. 
Tribe BRACHYURA 
Kry TO THE SUBTRIBES OF THE BRACHYURA 
I. Mouth-field (endostome) triangular, narrowed in front, produced forward 
over epistome to form a gutter; efferent branchial channels opening at 
middle of endostome; third maxillipeds more or less narrow, not expanded 
into flat, lid-like structures as in other crabs. Carapace more or less 
circular. Female openings generally on sternum. First pleopods wanting 
in female. 
Oxystomata, p. 185. 
II. Mouth-field roughly square. 
A. Last pair of legs abnormal, small, and subdorsal in position, as are 
often also the legs of the fourth pair. Antennae long, flagellum 
equal to more than one-half width of carapace; antennules without 
special fossettes; sometimes a common orbito-antennulary fossa pres- 
ent. Female openings coxal. First pleopods present in female. 
(Not known north of Monterey Bay.) 
Dromiacea, p. 182. 
B. Last pair of legs normal, rarely reduced, not dorsal. Antennae short, 
never equal to one-half width of the carapace; antennules usually 
lodged in special fossettes. Female openings sternal, rarely coxal. 
First pleopods wanting in female. 
Brachygnatha, p. 191. 
Subtribe DROMIACEA 
Kry TO THE SUPERFAMILIES AND THE CALIFORNIA FAMILIES OF THE DROMIACEA 
I. Sternum of female with a pair of obliquely longitudinal grooves. Eyes and 
antennules almost always retractile into common orbito-antennulary pits. 
Rudimentary uropods usually present. (Superfamily Dromiidea.) 
Dromiidae, p. 183. 
II. Sternum of female without longitudinal grooves. Eyes not retractile into 
orbits nor antennules into pits. Uropods never present. (Superfamily 
Homolidea.) 
Homolidae, p. 183. 
