268 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



united on the authority of A. Milne Edwards (1868) who says, 



"Le Xantho vermiculatus des Antilles a 6t6 signale k Angola par 



M. CapeUo." 



Genus DAIRA de Haan 



Daira de Haan, Fauna Japon., Crust., 1833, pp. 4 and 18; type, D. perlata 

 (Herbst) = Cancer perlatus Herbst, 1790 = Cancer daira Herbst, 1801 = Cancer 

 (Daira) perlatus de Haan, 1833. 



Lagostoma Milne Edwards, Hist. Nat. Crust., vol. 1, 1834, p. 386; type, L. 

 perlata (Herbst) = Cancer perlatus Herbst, 1790. 



Carapace broad, oval, strongly convex in both directions, regions 

 well delimited and subdivided into very numerous rounded, convex 

 lobules ; antero-lateral borders strongly arched, crenate ; postero-lateral 

 borders concave, very short. Front deflexed, bilobed, lobes con- 

 spicuous and prominent. Orbital margin thickened and smoothly 

 crenulate, a strong suture line in lower margin. Eyes on short thick 

 subglobular stalks. Antennules folding obliquely owing to large size 

 of basal article; interantennular septum broad. Basal article of 

 antenna not touching front, the next article and the very short 

 flagellum wedged in gap between orbit and front. Merus of outer 

 maxillipeds with a wide and deep notch in anterior margin. 



Chelipeds unequal in both sexes; finger tips either spoon-shaped 

 or acute. Upper edge of merus of chelipeds and legs crestlike, 

 serrated; upper edge of succeeding joints of legs with a crest of stout 

 sharp spines; ail this ornamentation concealed bj^ a thick fringe of 

 long coarse hair. Abdomen of male with all seven segments distinct, 

 but the 3rd-5th not movable on one another. (After Alcock.) 



Contains two species, D. perlata, widely distributed through the 

 Indo-Pacific region, and D. americana from the west coast of middle 

 America. 



DAIRA AMERICANA Stimpson 



Plate 110, Figures 1 and 2 



Daira americana Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 1860, p. 212 

 [84] (type-locality, Cape St. Lucas; type in M.C.Z.). — A. Milne Edwards, 

 Nouv. Arch. Mus. Hist. Nat., Paris, vol. 1, 1866, p. 299, pi. 16, figs. 4-4c. 



Diagnosis. — Thick tufts of hair among tubercles of carapace. 

 Finger tips pointed, not spooned. 



Description. — The furrows separating the different areoles or 

 groups of tubercles on the carapace are filled with thick tufts of coarse 

 hair; these tufts are scarce on the posterior third of the carapace, 

 and are almost absent from a young female 10.8 mm. wide. Tubercles 

 crowded with fine flattened granules, and marked in many cases with 

 impressed lines or patterns of punctae; punctate lines also separate 

 individual tubercles. The five large crenations of the antero-lateral 

 margin are separated by units of one or two smaller crenations, best 

 seen from below, hairy above. 



