214 ARANEIDEA. 
hair tipped with white on the first pair of legs, and the tufts of hair on the tibia of the 
palpus. At first sight, it may be taken for a Habrocestum, but the form of the tarsus 
and bulb of the palpus will at once prevent any confusion. 
16. Sidusa spirorbis, sp.n. (Tab. XVI. figg. 11, lla-«, ¢.) 
Type, ¢, in coll. Godman & Salvin. Total length 4:5 millim. 
Hab. Panama, Bugaba (Champion). 
This small species resembles 8S. cristata in the fact that the first pair of legs alone is 
fringed with hairs, but the disposition and character of the fringes are very different. 
The differential characters will be found in the Table and on the Plate. 
17. Sidusa nigriventer, sp. n. (Tab. XVI. figg. 12, 12a-d, ¢; 13, 2.) 
Type 3, gynetype 2, in coll.Godman & Salvin. Total length, ¢ 2, 8 millim.; a smaller example, 5 millim. 
¢ 2. Carapace brown, cephalic area black, with a broad pale band behind the posterior eyes and continued to 
the anterior margins on each side. Legs unicolorous yellow. Abdomen rich brown or black, mottled, 
with a broad, anterior, pale band continuous in front and running obliquely along the sides: on the posterior 
half is a large transverse oval area cut out by a pale band, with a pair of pale spots in the centre; the 
pale band broadens at the spinners, and bears one or more small black central spots. (These pale and 
dark central longitudinal spots are the remains of the normal chevrons.) Lateral areas palo, speckled with 
dusky brown ; ventral area pale, with a broad black longitudinal central band, beginning at the genital 
rima, but not quite reaching the spinners. 
Tibia i. with lateral spines on the inner side; protarsus i. with lateral spines on both sides; tibie iil. and iv. 
without any dorsal basal spine. 
Vulva consisting of a pair of white auriculoid discs confluent on the central line, with a pair of dark oval 
discs behind. 
Hab. Panama, Bugaba (Champion). 
18. Sidusa murcida, sp. n. (Tab. XVI. figg. 14, 144, ¢.) 
Type, 2, in coll. Godman & Salvin. Total length 6 millim. 
Carapace brown, cephalic area as far as the central stria clothed with white hairs, and with a posterior. 
marginal white band. Legs yellow, apical half of femora and apex of each other segment annulated 
with brown. Abdomen brown, with an anterior marginal black. band, followed by a white band, not 
interrupted in the middle, and continued obliquely at least two-thirds along the lateral margin. The 
dorsal area is somewhat deprived of hairs, but the parenthetical white curved lines on each side in the 
apical half are present. Tibia i. with lateral spines on the inner side; protarsus i. with lateral spines on 
both sides ; tibia iii. and iv. with a small dorsal basal spine. 
Vulva consisting of a pair of small circular discs, bounded by a duct, in contact on their inner margin with a 
black spot, possibly marking an orifice on the outer posterior margin. The discs are situated almost 
a diameter from the genital rima. 
Hab. Guatemata (Sarg). 
19. Sidusa fulvoguttata, sp. n.. (Tab. XVII. figg. 1, 1a, 2.) 
Type, 2, in coll. Godman & Salvin. Total length 8°5 millim. 
Carapace brown, with a posterior marginal white band and other white spots (much obliterated) on the cephalic 
and thoracic areas. Abdomen brown, with a pair of slender, parallel, white lines on each side on the 
