182 . ARANEIDEA. 
abdomen. Its colour is black, with a submarginal crescent or transverse curved narrow band of white at 
the fore extremity of the upperside, and another narrower one, with a break in the centre and an angle 
on the sides, across the middle, followed by some small distinctly white spots along the median line 
towards the spinners, two in a transverse line, and then single ones; on the underside are two less 
distinct white spots in a longitudinal median line on the hinder half, 
Hab. Costa Rica (Sarg). 
DELOZEUGMA, Cambridge. 
Delozeugma mordax, sp. n. 
Adult male, length 23 lines. . 
In general form and appearance this spider nearly resembles D. depictum (supra, p. 145). It is, however, much 
smaller, and differs, notably, in the structure of the palpi and palpal organs. 
Cephalothorax bright yellow-brown, with darker converging lines indicating the normal grooves and 
indentations. ; 
Eyes of the posterior row very nearly straight, the convexity of its slight curve perhaps directed backwards and 
that of the anterior row forwards. The laterals are on strongish tubercles, the fore-laterals largest, the 
fore-centrals, if anything, the smallest of the eight. The intervals between those of the anterior row are 
equal, that between the hind-centrals is more than two diameters, each hind-central being slightly less 
than two from the hind-lateral eye on its side. The four central eyes describe a quadrangle whose 
breadth is greater than its width, and its anterior side shortest. Some strong bristly hairs are directed 
forwards from the clypeus, which in height is equal to the diameter of the fore-central eyes. 
Legs 1, 4, 2, 3, moderate in length and strength; spines on all the joints excepting the tarsi mostly long and 
slender ; colour light orange-yellow. Tarsal claws 2, strongly toothed. The claw-tuft beneath the tarsal 
claws is composed mainly of several strong, flattened, broad, somewhat leaf-like processes, broadest and 
truncated at their extremity and springing from a small claw-joint. 
Falces long, strong, and straight, tapering, more than half the length of the cephalothorax, very projecting, and 
considerably cut away beneath on the inner side; dark reddish-yellow-brown in colour, glossy, with a few 
small granulosities, and bristly hairs on the surface, more striated and granulose towards their extremity 
on the inner side; some of the granulosities have a minute dentiform appearance and are surmounted 
with bristly hairs; in a line with those running backwards are two teeth on the lower inner margin, 
the posterior one strongest. 
Fangs long, strong, not dentate, but with an incrassation along the hinder half. The fangs are articulated 
nearly horizontally and lie straight backwards along the lower side of the falces, but have their direction 
a little obliquely inwards, their points thus crossing near their extremity. 
Palpi moderate in length and strength, similar in colour to the legs; radial rather longer than the cubital 
joint, the latter with one (at its fore extremity on the upperside), the former with several, strong bristly 
hairs; the radial joint has also at its outer extremity a strongish apophysis, somewhat bent outwards, 
broad, flattish, obtuse, with its extremity curiously hollowed or scoop-shaped, bearing a strong resemblance 
to the obtuse toe part of an old slipper; digital joint yellow-brown, of moderate size, elongate and 
obtusely keeled, oval in form. The palpal organs are well developed, but not very complex, with a sharp 
pointed, strongish, but not very long, spine directed downwards at their anterior extremity. 
Masille long, strong, much broader at their extremity than at the middle, rounded on the outer, obliquely 
truncate on the inner, extremity. 
Labium higher than broad, hollow-truncate at the apex, which reaches to a little above a level with the socket 
of the palpus, and so less than half the length of maxilla. The colour of the maxille and labium is 
dark yellowish-brown. 
The sternum is rather elongate-oval, its posterior extremity slightly drawn out into an obtusely rounded broad 
point between the coxe of the fourth pair of legs; it is very glossy, and its colour is yellow-brown. 
The abdomen is cylindric-oval, truncate in front; its colour is dull luteous-yellow-brown, with some dusky 
blackish-brown spots along the middle of the upperside in two longitudinal nearly parallel lines, the last 
