90 ARANEIDEA. 
The sternum is small, oval. The maxille, labium, and sternum are similar in colour and clothing to the 
cephalothorax. 
The abdomen is of moderate size, oval, of a deep dull brown-black, and clothed densely with hairs and long 
bristles, some of which are of areddish hue. The spinners are four in number, the superior ones the longest, 
but not very long, upturned, 3-jointed, or (counting the base) 4-jointed; the inferior spinners short, 1- or 
2-jointed, and placed immediately at the inner side of the base of the others. 
The male resembles the female in colour and general appearance, but the legs and superior spinners are 
longer, as are also the spines on the legs; beneath the fore extremity of the tibie of the first pair, 
and directed rather inwards, is a strong curved projection, densely clothed with bristles. The palpi of 
this sex have the radial joint nearly double the length, and stronger than the cubital, furnished with 
spines, hairs, and bristles, the latter longest and most numerous underneath; digital joint short; the 
palpal organs consist of a basal bulb produced gradually in a pyriform curved shape, and ending in a 
rather obtuse point directed outwards. The colour of these organs is black-brown on the convex, and 
red on the concave side. 
Hab. Costa Rica (Rogers). 
The genus Sphwrobothria appears to come near Hurypelma, Koch, and may be 
easily distinguished by the remarkable subconical plug with which the thoracic inden- 
tation is closed up. 
Numerous examples of the female, and also two males, of this remarkable spider 
were contained in the collection made by Mr. H. Rogers in Costa Rica in 1878. The 
male is new to science, the genus and species having been established by Dr. Karsch 
upon the female only. Dr. Karsch’s specimen also came from Costa Rica. 
EURYPELMA, Koch (Auss.). 
Eurypelma mesomelas, sp. n. 
Adult male, length 21 lines, to end of falces 25 lines; length of cephalothorax nearly 12 lines; breadth, a 
little over 10 lines. 
The cephalothorax, the abdomen, and the femora of all the legs are covered with a dense, smooth, velvety-black- 
brown pubescence ; the cephalothorax more or less tinged with brown. The fore extremities of the femora 
are furnished thickly with foxy-red hairs, as also are the genua and portions of the other joints, especially 
on the upper sides of the first and second pairs of legs ; these other joints have also numerous black and 
brown hairs in parts, with which are mixed some very long, prominent, foxy-red bristles. The tarsi are all 
dull blackish, and beneath them and the metatarsi is a dense scopula, The tibia and metatarsi are armed 
with not very strong spines. At the fore extremity of the tibie of the first pair of legs on the inner side, 
rather underneath, are two strong, prominent, processes densely clothed with bristly hairs. The abdomen 
is thinly furnished towards the hinder part with long foxy-red bristles. 
The eyes are small, seated on a rather small, but distinct, transverse-oval eminence, close to the fore margin of 
the cephalothorax. The two central eyes are placed in a transverse line near the middle of the eminence, 
the interval between them being distinctly more than a diameter. The other eyes are situated three on 
each side rather close together; the two posterior eyes of these three are contiguous to each other, and 
the anterior eyes (which are each separated from the central eye next to it by a space equalling the 
diameter of the latter) are the largest of the eight. 
The palpi are similar to the legs in colour, strong, and rather long ; the humeral joints are black-brown like 
the femora of the legs; the other joints are more or less bright foxy-red; the radial joints are longer 
and stronger than the cubital, furnished with spines, and numerous long bristly hairs beneath ; the 
digital joint is small, and cleft at its fore extremity; the palpal organs consist of the usual somewhat 
