NO. 3 GARTH : SOME NEW SPECIES OF BRACHYURAN CRABS 61 



Genus NOTOLOPAS Stimpson 



Notolopas mexicanus, new species 

 Plate 14, Figs. 1-4 



Type: Male, holotype; to be deposited in the U.S. National Museum, 

 from south and west of White Friars, Guerrero, Mexico, 25 fathoms, 

 rock with gorgonids; March 2, 1934; collected by Allan Hancock Ex- 

 pedition of 1934 at Velero Station 264-34. 



Measurements: Male holotype: length of carapace 7.5 mm., width 

 5.2 mm., length of cheliped 11.1 mm., of chela 4.2 mm. 



Diagnosis : Merus of outer maxilliped subtriangular. Rostrum short. 

 Second antennal segment papillate. No posterior carina. Cardiac region 

 high, dome shaped. 



Description: Carapace subpyriform, convex, and posteriorly rounded. 

 Regions elevate, separated by deep, naked sulci and surmounted by reg- 

 ularly arranged tracts of curved setae. Rostrum short, horns divergent 

 and papillate, each bearing two rows of curved setae, tips incurving. 

 Supraocular spine slender and curving forward ; postocular cup broad, 

 exteriorly flattened ; a minute tooth between pre- and postocular projec- 

 tions. Four equidistant setose tubercles on carapace, one gastric, two 

 branchial, and one intestinal; cardiac area dome shaped, well separated 

 from branchial swellings. Hairs of carapace restricted anteriorly to 

 well-defined tracts of which the two epigastric are most isolated; pos- 

 teriorly and laterally the growth of hairs is more diffuse. Intestinal area 

 projecting slightly below the general level of the posterior border; no 

 lamellate posterior carina indicated. 



Antennules folding almost longitudinally. Basal antennal article 

 wide, concave, edge thin, a blunt spine at anteroexternal angle, a shallow 

 lobe near base, and a tubercle opposite green-gland opening; first movable 

 segment slender, spinulous, reaching nearly to tip of rostrum and visible 

 in dorsal view; flagellum overreaching rostrum by twice its length. 

 Merus of third maxilliped produced at both internal and external distal 

 angles until almost triangular; ischium with internal margin spinulous. 

 Two compressed lobes on pterygostomian ridge. A pair of deep sternal 

 indentations opposite coxae of chelipeds. 



Chelipeds of male stouter than legs, merus and propodus of approxi- 

 mately equal length. Merus with four evenly spaced tubercles along 

 inferior margin, of which the proximal is largest. Manus moderately 

 compressed, fingers gaping slightly at base, regularly toothed, tips 

 crossing. 



