ISOPODS OF NORTH AMERICA. 551 



ARGEIA PAUPERATA Stimpson. 



Argeia pauperata STIMPSON, Bost. Jour. Nat. Hist., VI, 1857, p. 511. 



Argeia depauperata a RICHARDSON, Proc. U. S. Nat. Mus., XXI, 1899, p. 868; Ann. 



Mag. Nat. Hist. (7), IV, 1899, p. 337; American Naturalist, XXXIV, 1900, 



p. 308. 

 Argeia pauperata BONNIER, Trav. de la Station Zool. de Wimereux, VIII, 1900, 



p. 328. 

 Argeia depauperata RICHARDSON, Proc. U. S. Nat. Mus., XXVII, 1904, p. 64. 



Locality. San Francisco Bay. on Orago franciscorum. 



"This species is somewhat larger than the preceding (Argeia pug et- 

 tensis Dana); the head is comparative!}- smaller, more tumid, and 

 bilobate; the egg-pouch covers the eggs more completely; and the 

 thoracic branchial appendages are apparently absent in some of the 

 anterior segments. The inner branches of the first three pairs of 

 abdominal appendages are broader; those of the last three pairs are 

 wanting. Length, 0.35; breadth, 0.23 inch. This description is taken 

 from a female. Found in specimens of Orago franciscorum, from 

 San Francisco Bay." STIMPSON. * 



93. Genus PARARGEIA Hansen. 



Branchial parasites. 



Female with thoracic processes wanting on all the segments. 



Abdomen without pleural lamellae, the lateral parts not developed. 



There are five pairs of biramous pleopoda; the outer branches are 

 elongate and attached close to the lateral margins of the segments; the 

 inner branches are small, oval. 



Uropoda simple, single-branched. 



Male with all the segments of the thorax distinct. The segments of 

 the abdomen are fused in a large rounded, oval, terminal piece, which 

 has a prominent median dorsal tubercle near the base. 



PARARGEIA ORNATA Hansen. 



Parargeia ornata HANSEN, Bull. Mus. Comp. Zool. Harvard College, XXXI, 1897, 

 pp. 120-122, pi. vi, figs. 1-2. RICHARDSON, Proc. U. S. Nat. Mus., XXI, 

 1899, p. 869; Ann. Mag. Nat. Hist. (7), IV, 1899, p. 338. BONNIER, Travaux 

 de la Station Zool. de Wimereux, VIII, 1900, pp. 329-332. RICHARDSON, 

 Proc. U. S. Nat. Mus., XXVII, 1904, p. 64. 



Locality. Off Acapulco, Mexico, on Sclerocrangon procax Faxon. 



Body of female somewhat asymmetrical; length 8 mm.; width 7 

 mm. 



Head wider than long, 1 mm. : 2 mm. Front of head with a marginal 

 border somewhat upcurved and anteriorly arcuate. Eyes absent. The 

 first pair of antennae are composed of three articles, the last of which 



By error. &Bost. Jour. Nat. Hist, VI, 1857, p. 511. 



