2 £6 NATURAL HISTORY BULLETIN. 



Long hairy ; frontal lobes oblique; orbits spinous; lateral 

 spines four ; chelipeds spinous. 



Carapace covered on its anterior half with spiniform gran- 

 ules and a few long hairs; posterior half almost smooth. Front 

 bilobed; lobes separated by a broad U-shaped sinus; each 

 lobe has an oblique margin armed at either end with a short 

 spine; next the inner spine there is a short, shallow sinus r 

 armed with minute spinules; remainder of the front unarmed. 

 Superior orbital margin armed with four long spines, the two 

 innermost curving toward each other. Lateral margin with 

 three long spines besides the orbital, the posterior spine being 

 a little shorter. Lower orbital margin armed with ten small 

 irregular spines. The outermost is separated from the post- 

 orbital spine by a deep sinus; the two innermost are situated 

 at the extremity of a prominent suborbital process; the next 

 two are among the largest; the remaining five are very short 

 spines or spiniform teeth. 



Chelipeds of the male unequal; merus with two long curved 

 spines at the distal end of the upper margin; carpus armed 

 with about 20 sharp spines curved toward the manus. Larger 

 manus with about seven irregular rows of spines which cover 

 about two-thirds of the outer surface; they are large above 

 and gradually diminish in size downward. On the smaller 

 manus, the spines cover the outer surface, 



Dactyli spinulous on the proximal half. Ambulatory legs 

 long and hairy; meri spinulous above; carpi and propodi 

 armed with long spines. 



Dimensions. — Length, 8.3 mm.; width, 11.6; width without 

 spines, 10.5. 



The character of the front and orbits sufficiently distinguishes 

 this species from all others. 

 70. Pilumnus lacteus Stimpson, not A. Milne Edwards. 



Tortugas. 

 Pilumnus andrewsii sp. nov. PI. v, Fig. 2. 



Slightly hairy; front and orbits not spinous; lateral spines 

 and teeth five; outer surface of hands smooth and naked. 



