THE SPIDER CRABS OF AMERICA 421 



Material examined. — 



Porto Rico; Gundlach, collector; 1 small male (Cat. No. 4790, 

 Berlin Mus.). 



Guadeloupe; 1 male (Paris Mus.). 



MITHRAX(7) LEUCOMELAS Desbonne 



Mithrax leucomelas Desbonne, iu Desbonne and Schramm, Crust. Guade- 

 loupe, 1867, p. 11 (type-locality, Guadeloupe; type not extant). 



Diagnosis. — Carapace, one-fourth longer than wide, without spines 

 or lateral angle. 



Description (translated from Desbonne). — Carapace depressed, 

 rugose, without spines, a little longer than wide, sub triangular ; antero- 

 lateral borders slightly denticulated: lateral and posterior angles of 

 the carapace rounded, not spinous. Rostrum very small, horizontal, 

 bifid. Orbits directed forward and outward, a spine on the outer 

 border and two on the inner border (one superior and the other 

 inferior). The eyes fold in a postforaminal cavity. The inner 

 antennae are directed forward and separated by a spiniform pro- 

 longation. The outer antennae have the first segment well developed, 

 fused with the front and forming part of the walls of the orbits. 

 Abdomen composed of seven articles in both sexes. 



Chelipcds equal, a little more developed than the legs and one and 

 one-fourth times as long as the carapace; naked and smooth. Fingers 

 broad, gaping, ending in a deep spoon with sharp and denticulated 

 edges and a bunch of haii-s at the bottom. First leg same length 

 as cheliped, the other three legs successively diminish in length; 

 dactyls with 4 or 5 spines below. 



Color. — White and black in large spots. 



Measurements. — Type (sex not given), length of carapace 20, 

 width 16 mm. 



Habitat. — On the rocky shores of Guadeloupe; found at Moule 

 (rare) . 



Remarlcs. — Nothing is known of this species except the original 

 description by Desbonne. Schramm himself could not find the speci- 

 mens described. 



MITHRAX, species indeterminable 



XocaZi^^/-— ^'alparaiso Bay, Chile; 25 fathoms; C. E. Porter, col- 

 lector; one specimen in too poor condition for determination or 

 description, the genus alone being certain. Specimen returned to 

 sender. 



Subgenus Mithraculus 



Carapace with conspicuous, smooth, oblique, branchial sulci. 

 Rostral horns very short, shorter than wide, truncate. Minor teeth 

 of orbit tuberculiform, inconspicuous. 



