MUSEUM OF COMPARATIVE ZOOLOGY. 251 



Oculiferous segment swollen, of greater diameter than that of the body, nar- 

 rowing slightly in front ; it is nearly as long as the two following segments 

 taken together. Its vertical diameter is much less in front than behind, the 

 lower surface being oblique. Oculiferous tubercle extremely prominent, coni- 

 cal, acute, placed at the extreme anterior end of the segment, almost directly 

 above the attachment of the antennae. Ocelli dark chestnut-brown, iridescent ; 

 anterior pair three times as large as the posterior, lying at a much lower level. 



Rostrum considerably longer than the oculiferous segment, nearly cylindrical 

 but slightly swollen near the middle and again near the tip. Abdomen slen- 

 der, slightly clavate, about as long as the three posterior body-segments taken 

 together. 



"Antennae" (Fig. 18) with two slender equal basal joints which extend be- 

 yond the rostrum ; they are separated by a delicate slightly marked articula- 

 tion ; chelae stout, swollen, very hairy ; claws very short, flattened, with thin 

 overlapping cutting edges forming a scissors-like organ. 



Palpi (Fig. 17) represented by a pair of simple roimded knobs at the sides of 

 the rostrum. They are articulated to the body, and seem to represent a single 

 joint. 



Accessory legs (Fig. 17) stout and well developed in the male, small and 

 weak in the female ; 1st joint (male) short, swollen, about equal to 3d ; 2d, 

 4th, and 5th, nearly equal and about twice tho 3d ; 6th, less than 5th, strongly 

 curved, swollen at distal extremity ; 7th, still less, with a peculiar tAnst, so 

 that the appendage cannot be straightened ; 8th and 9th, equal to 7th, or 

 less ; 10th, very small, rounded. Outer joints sparsely covered with simple 

 hair-like spines, many of which are directed backward, especially at the distal 

 extremity of the 6th joint, where they are very short and stout, and form an 

 irregular circlet. 



Legs long, rather slender, three and a half times as long as the body (in- 

 cluding rostrum and abdomen) ; 1st and 3d joints very short ; 2d, much 

 longer, clavate ; 4th, 5th, and 6th, very long and slender ; 6th, longest and most 

 slender ; 7th (tarsus), very short, nearly triangular, with a row of strong spines 

 along the lower side ; 8th (propodus), gently curved, three and a half times 

 the tarsus (longer margin) armed with an irregular series of strong, more or 

 less appressed spines along the lower side (Fig. 16), which vary in arrangejnent, 

 but are longer towards the proximal end ; dactyl us a little more than one half 

 the propodus, auxiliary claws one fourth the dactylus. 



The surface is everywhere finely tuberculose ; the tuberculation is coarser on 

 the accessory legs than elsewhere. The body is sparsely hairy, the rostrum is 

 also hairy, and the abdomen still more so. The legs are rather conspicuously 

 hairy, the hairs becoming stouter and more spine-like on the outer joints. 



Color, pale yellowish or straw-color. A narrow brown stripe, representing 

 a thickening of the chitin, extends along each side of the legs. 



Near the middle of the fourth joint of each ambulatory leg on its anterior 

 side, in the male, is a slight elevation, from which arises a short tubular organ, 

 which is apparently the duct of a glandular organ within the joint- 



