•40 

 •60 



314 ME. A. D. MICHAEL ON THE VARIATIONS IN THE 



H^mogamastjs nidi, sp. n. (PL XXXII. figs. 6 and 7.) 



? <?' 



Length without rostrum, about '94 mm. -72 mm. 



Breadth, about '"1 » 



Length of legs, 1st and 4th pairs, without caruncle or ungues, about "78 „ 



„ „ 2nd „ 3rd „ „ „ „ „ '53 „ "45 „ 



This species is so like H. horridus in general appearance that I have not thought 

 it useful to draw a figure of it; there are, however, well-marked anatomical differ- 

 ences; it is also much smaller and lighter in colour. Its movement is different 

 from that of H. horridus; S. nidi moves in little jerks or springs, H. horridus 

 does not. 



Colour yellow-hrown, not very dark. 



Texture. The whole, or almost the whole, dorsal surface is covered with a chitinous 

 plate ; the chitin, however, is very thin, and allows the Malpighian vessels and 

 often the ventriculus to he plainly seen through the dorsum; it is smooth, hut not 

 polished ; there are not any markings on the chitin. Sometimes a narrow border of 

 soft cuticle is seen round the hinder part of the body, especially in the female, but 

 not nearly so wide or conspicuous as in R. horridus. 



Shape. Long, almost parallel-sided ; posterior end rounded, anterior slightly 

 shouldered and narrowed. Dorsal surface rather flat. 



Mandibles of the male (fig. 6) with the fixed arm of the chela gradually dirniaishing 

 in thickness and curving downward, forming a slightly recurved pointed claw-like 

 endin°'; there is one strong tooth far back. The movable arm is a very powerful 

 strongly curved piece which overlaps the fixed arm, when closed, some distance 

 behind the point of the latter. Prom the outer side of the movable arm springs a 

 laro-e doubly-curved accessory piece, which extends a little beyond the end of the 

 fixed arm, and curves upward ; it is truncated at its distal end ; but at the inner 

 edo-e of the truncated surface arises a sharp spine, directed perpendicularly upward 

 close to the end of the fixed arm ; there is also a second accessory piece almost hidden 

 by that last described. 



Epistome (fig. 7) rather irregular, sub-triangular, with rounded apex and concave 

 sides; the greater part of the lateral edges and the distal edge are fringed with 

 processes which can hardly be called hairs, but are rather long ragged projecting 

 pieces of the material of the epistome itself; they are not set close together nor 

 bisyminetrically on the two lateral edges. 



Legs rather near together, long and thin, without apophyses in either sex. All 

 legs terminated by long-shaped caruncles and claws. Legs furnished with numerous 

 curved hairs and spines. 



Dorsal surface densely clothed with short spine-like hairs set in transverse wavy 

 rows, the hairs slightly longer than the distance between the rows, and alternate; 

 they all point backward except those at the lateral edge, which stand slightly outward 

 and form a fringe. The hairs increase a little in length from the anterior to the 

 posterior end of the body; the longest are those on the soft cuticle. Length of 



