434 



BULLETIN" 15 8, UNITED STATES NATIONAL MUSEUM 



PANDARUS SMITHII Rathbun 



Figure 272 



Pandarus smithii IIathbun, Proc. U. S. Nat. Mus., vol. 9, p. 315, pis. 5, 7, 1886. — 

 Wilson, Proc. U. S. Nat. Mus., vol. 33, p. 410, pis. 29, 30, 1907. 



Ocawrrence. — Both sexes taken from the fins of the dusky shark, 

 the sand shark, the great white shark, and the brown shark {Garcha- 

 rhinus milberti) at Woods Hole and in the pound nets on Marthas 

 Vineyard. 



Distribution. — Hawaiian Islands; Gulf of Mexico; Laysan Islands, 

 Pacific Ocean; Great South Bay, Long Island (Wilson). 



Color. — Female a rich brownish black, the margins of the carapace 

 and the dorsal plates, and a spot through the eye yellow or reddish. 

 Male yellowish white and nearly transparent. 



Female. — Carapace ovate, wider than long, with short posterior 

 lobes, the margin between them with a row of coarse, bluntly rounded 



teeth. Lateral plates of 

 second segment strongly 

 divergent, twice as long as 

 wide; between their bases 

 an unpaired median plate, 

 subtri angular in outline ; 

 dorsal plates of third seg- 

 ment circular, completely 

 separated on the midline, 

 and reaching little behind 

 the center of the plates on 

 the second segment. Plates 

 of fourth segment enor- 

 mous and covering three- 

 fourths of the genital seg- 

 ment, with a short and narrow posterior sinus. Genital segment el- 

 liptical, with short and blunt posterior lobes; sixth segment plate 

 ovate, one-third longer than wide, strongly narrowed anteriorly ; cau- 

 dal rami as long as sixth plate and divergent. Total length, 8-10 mm. 

 Male. — Carapace, including posterior lobes, longer than wide, nar- 

 rowed but little anteriorly; posterior lobes wide and blunt; acces- 

 sory lobes wider than long. Second, third, and fourth segments in- 

 creasing in length backward, but diminishing in width ; fourth seg- 

 ment as wide as genital segment, with strongly convex lateral mar- 

 gins. Genital segment subquadrangular, wider than long; sixth leg 

 rudiments larger than the fifth, but blunt and unarmed. Abdomen 

 more than half as wide as the genital segment, much wider than long, 

 basal segment shorter than terminal; caudal rami as wide as long, 



Figure 272. — Pandarus smithii: a. Female, dorsal 

 6j male, dorsal 



