206 BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



CALAPPA CONVEXA Saussure 



Plate 62, Figures 1-3 



Calappa convexa Sattssure, Rev. Mag. Zool., ser. 2, vol. 5, p. 362 [9], pi. 13, 

 fig. 3, 1853 (type locality, Mazatlan, Mexico; type not located). — Boone, 

 Zoologica, vol. 8, p. 280, fig. 281, 1927. 



Calappa xantusiana Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, p. 237 

 [109], 1860 (type locality. Cape St. Lucas; type not extant). 



Diagnosis. — Posterior third of carapace with short transverse granu- 

 lated ridges. Surface covered with fine dots of color on a dark ground. 



Description. — Length of carapace two-thirds to three-fourths of 

 breadth. Allied to C. jlammea in its little protruded front and in 

 the character of the surface. It is, however, more convex than that 

 species, and the triangular teeth of the posterolateral margins are 

 more strongly carinated along the middle above; also there are nu- 

 merous short transverse crenulated carinae on the posterior third 

 of the carapace; elsewhere the surface is depresso-papillose and 

 crowdedly granulated. The frontal sinuated margin and teeth are 

 obtuse and there is no median denticle. Hands much higher than 

 greatest length; superior crests 6-toothed, teeth less acute than in 

 C. flammea; granules smallest near upper border, increasing in size 

 and decreasing in numbers toward lower margin; two horizontal 

 rows of tubercles on lower third meet at proximal end and are con- 

 tinued upward at proximal end almost at a right angle, the tubercles 

 increasing in size. 



Color. — A dried specimen has the carapace dull red with fine dots 

 of pale yellow; granulated ridges also yellow. On the carpus and 

 distal end of merus of chelipeds the yellow spots are larger; on the 

 upper half of the manus the ground is red with irregular splotches of 

 yellow, on the lower half the ground is yellow with httle red. Carpus 

 and propodus of legs red with large white spots; on the merus the 

 white predominates. Fingers for the most part a dull leaden gray 

 in the major chela, gray only at finger tips of minor chela. 



Measurements. — Male (59275), extreme length 83, extreme width 

 115, width at sinus in front of lateral wings 103.4 mm. Male, Los 

 Angeles Mus., length 85.2, width 129 mm. Female (50652), extreme 

 length 98.2, extreme width 142.4, width at sinus in front of lateral 

 wings 114.5 mm. 



Range. — Magdalena Bay, Mexico, to Ecuador; shore to 10 fathoms. 



Material examined. — See table 66, p. 208. 



CALAPPA SAUSSUREI Rathbun 



Figure 43, Plate 63, Figures 1-4 



Calappa saussurei Rathbun, Proc. U. S. Nat. Mus., vol. 21, p. 609, pi. 41, fig. 6, 

 1898 (type locality. Gulf of California, 26^2 fathoms; type, U.S.N.M. no. 

 21596). — Finnegan, Journ. Linn. Soc. London, Zool., vol. 37, p. 611, fig. 1, 

 1931. 



