218 ARANEIDEA. 
ARGYROEPEIRA, Emerton. 
Argyroepeira debilis. 
Argyroepeira debilis, Cambr. antea, p. 5, t. 1. fig. 9. 
This species was described from two damaged specimens of the female only from 
Panama: examples of both sexes, since received, from Mexico, confirm the validity of 
the species and the general correctness of its description. As regards the fernale, it 
may be added here that the legs of the first pair are of great length, greatly exceeding 
that of the rest; the colour of the tibic, metatarsi, and tarsi of this pair is darkish 
yellow-brown ; the extremities of its femora and tibie are strongly suffused with reddish- 
brown, though scarcely amounting to definite annulation. 
The length of the male is 11 line: in its general colours and markings it resembles the female; its anterior 
legs, however, are still longer in proportion to the rest, and they are all more unicolorous, though showing 
some traces of brown at the extremities of the femora and tibie of the first pair. The palpi are short, 
the cubital and radial joints very short and of equal length ; from the upperside of each issues, among others, 
a long slender bristle, that on the cubital joint shortest but strongest ; digital joint oval, equal in length 
to the cubital and radial joints together. Palpal organs simple, consisting of a large, toothed, oval, 
prominent pale lobe as long as the joint, and its anterior extremity ending with a short double or 
somewhat bifid process, and issuing from the point of the longer of these processes is a very minute 
black filiform spine. On the sides of the abdomen in this sex the silvery spots are less numerous, but 
individually larger, and towards the lower part of each side, nearer to the spinners than to the fore 
extremity, is a clear oblique space or short band without any spots. The abdomen itself is also less 
elevated, that of the female being nearly globular, while that of the male, though very convex above, does 
not nearly approach the convexity of that of the female. 
Hab. Muxico, Teapa in Tabasco (H. H. Smith). 
Though this spider is an undoubted Epeirid, Mr. Smith’s note leaves it doubtful 
whether A. dedilis spins a geometric snare or not. He says:—“ ‘here were irregular 
threads at the ends of the bushes, over a highland stream, on which these spiders were 
found ; in two cases single lines stretched to bushes on the other side of the stream, 
but I could discover no other web.” 
LABDACUS, Cambridge. 
Labdacus prolatus, sp. n. 
Adult male, length 5 lines. 
Cephalothoraw of normal form, short-oval, but to the lateral marginal indentations of the caput rather longer 
than broad; truncate both at the anterior and posterior extremities, flattened above, the profile line a 
little depressed at the thoracic indentation, which is strong and broad. Colour pale yellow-brown, 
margined with black and with some fine scratchy red-brown markings on the surface; the fore part of 
the ocular area is suffused with dark yellow-brown. Height of the clypeus equal to the diameter of one 
of the fore-central eyes. 
Eyes of unequal size and in normal position. The four central ones form a quadrangle longer than broad and its 
anterior side much the shortest; on each side the lateral pairs are seated on the outer side of a strong 
black tubercular prominence, and rather behind the straight transverse line of the hind-centrals, the hind- 
lateral eyes being largest of the eight and the fore-laterals the smallest. The fore-central pair are seated 
on the rather prominent fore extremity of the caput and are separated by an eye’s diameter ; the interval 
between the hind-centrals, which are seated on black tubercles, is rather distinctly more than a diameter, 
