286 BULLETIN 120^ UNITED STATES NATIONAL MUSEUM 



either side posteriorly there is a small tubercle. Gastric region promi- 

 nent with a low posterior tubercle and another oblong anterior one 

 equally distinct. Intestinal region with a small tubercle. All the 

 tubercles are mostly concealed by the villosity of the surface, so as 

 not to be seen unless it is removed. (Dana.) 



Rostrum flat, horns evenly and slightly divergent and setigerous 

 within. Basal article of anteima subquadrate, outer angle projecting ; 

 next article twice as long as the second movable one, both flat and 

 ciliate on the outer side, the last one ciliate on both margins ; antero- 

 external angle of basal article set with minute spinules or hairs ; also 

 a prominence at posterior angle is raggedly but minutely denticulate. 

 Outer maxillipeds pubescent. A fringe of rather short hairs on oppo- 

 site (upper and lower) margins of legs. (Dana.) 



Color. — Carapace and chelipeds yellow tinged with red (M. Ed- 

 wards and Lucas). Reddish brown; hair bro■v^^l; hands red (Bell). 

 Chelae bright rose (Miers). 



Measurements. — The largest specimen recorded was measured by 

 Dana: Male, Valparaiso, length 16 lines (34 mm.), width 12 lines 

 (25.4 mm.), length of rostrum 4 lines (8.5 mm.). Sex not given, Chili, 

 length 23 mm., width 16.5 mm. (M. Edwards and Lucas). Adult 

 male, Galapagos, length 6 lines (12.7 mm.), width 4 lines (8.5 mm.) 

 (Bell). Immature male, Valparaiso, length 9 lines (19.1 mm.), width 

 7 lines (14.9 mm.) (Bell). 



Range. — Panama to Straits of Magellan; Galapagos Islands. 



Localities recorded. — 



Panama (A. Milne Edwards). Galapagos Islands (Bell, A. Milne 

 Edwards). Chile (H. Milne Edwards and Lucas, A. Milne Edwards). 

 Iquique (Lenz). Valparaiso (Bell, Nicolet, Dana). Bay of Guajacan 

 (Lenz). Tumbes (Lenz). Talcahuano, in seaweed (Lenz). Calbuco 

 (Lenz). Trinidad Channel, 30 fathoms, sandy (Miers). Port Rosario, 

 2 to 30 fathoms, sand and rock (Miers). 



Material examined. — 



Chile; Guerin collection. No. 16; T. B. Wilson, donor; 1 male, 

 "type" of Pisoides tuberculosus (Mus. Phila. Acad. Nat. Sci.); 

 "rarissima." This may be one of the original type specimens; it is 

 larger than the specimen measured by Milne Edwards and Lucas^ 

 being 30 mm. in total length and 14.6 mm. in width. About three 

 obscure gastric tubercles form a median ridge, and the same number 

 are in a longitudinal row on the middle of the branchial region. 

 Rostral horns acuminate, being narrow spines; outer edges almost 

 parallel to each other. No preorbital spine; postorbital spine directed 

 obliquely upward and forward, but not outward. Basal antennal 

 article not visible in the dried specimen; first movable article lami- 

 nate, appearing half as wide as rostrum. Fingers narrowly gaping in 

 basal third. 



