ACROSOMA,. 63 
several strong corneous processes, one of which projects at their fore end, and is enlarged and trun- 
cated at its extremity. 
The sternum is dark black-brown, and its surface is marked with some converging grooves and. furrows. 
The abdomen is joined to the thorax by a short but distinct pedicle ; its breadth at the fore end is equal to 
that of the base of the thorax, but it enlarges gradually to at least double that breadth at the hinder 
end; it has a rudimentary prominence at each fore corner, two on each lateral margin, and one at 
each hinder corner. ‘These prominences are black, and give the margins of the upperside a sinuous 
appearance. The upper surface is glossy, and varies from dark yellowish-brown to blackish ; about the 
middle is a white spot followed towards the hinder extremity by two others, larger and close together in 
a transverse line; the sides and posterior extremity beneath are rugulose, of a yellowish-brown colour 
marked with vertical rows of whitish spots. The underside varies from yellowish-brown to black-brown. 
Hab. Panama, Bugaba (Champion). 
Acrosoma vitiosum, sp. n. 
Adult male, length 13-2 lines. 
Cephalothorax of a more than usually regular oval form, its colour deep pitchy-brown; the normal grooves and 
indentations obsolete, excepting a small indentation at the thoracic junction. The surface is covered 
closely with fine stric. 
The eyes of the central group form a quadrangular figure, longer than broad, its anterior side rather shorter 
than the posterior. 
The /egs are rather short, 4, 1,2,3, The femora and tibie of the first and second pairs are considerably stronger 
than the rest; they are furnished with hairs and spines, the latter weak and not very conspicuous ; 
colour yellow-brown, deepening into blackish-brown on the femora. 
The palpi are short and similar to the legs in colour. The palpal bulb is rather large. The digital joint has 
two subconical prominences, one at its base, the other near the middle; the radial joint is very short but 
prominent, both on its inner and outer sides. The palpal organs are very prominent, with several bold 
lobes and corneous processes. 
The sternum is small, oval, and black, and has the legs articulated to it as in A. parallelum. 
Abdomen rather longer than the cephalothorax, to which it is joined by a very short pedicle ; narrow in front, 
and enlarging gradually to its hinder extremity, which is roundly truncate ; it has a short-pointed pro- 
minence on each lateral margin nearer to the hinder than to the fore extremity, and another at each 
corner of the hinder extremity. Its colour is black, with a narrow anterior margin of yellowish-white, 
several irregular ochre-coloured spots or patches along each lateral margin, and a largish oblong-oval, 
transverse, convex, somewhat tuberculose spot of pale cream-colour near the middle of the upperside, and 
in front of this are three very minute points or prominences in a transverse line across the abdomen. 
The spinners are prominent and situated a little way from the posterior extremity. 
Hab. Panama, Bugaba (Champion). 
This spider is allied to A. brevipes, but may easily be distinguished by its darker 
hues and the stronger anterior legs (which latter are not spinose in A. brevipes), as well 
as by its markings and the very different structure of the palpi and palpal organs. 
Acrosoma 12-spinosum, sp. n. 
Adult female, length 23 lines, length of the abdomen 12 line. 
Cephalothorax longer than broad; thorax considerably gibbous just behind the thoracic junction, and per- 
ceptibly raised above the level of the caput; colour dull yellowish, with a broad longitudinal band of 
dusky brown on each side. 
Eyes of the central group forming a square whose posterior side is slightly shorter than the others. The poste- 
rior eyes of this group are much larger than the others, which, with the laterals, are very small. 
Legs 4, 1, 2, 3, slender ; similar in colour to the cephalothorax, furnished with hairs, and on the tibiz of the 
first pair are a few very fine spine-like bristles. All the femoral joints are finely granulose. 
