SIDUSA. 215 
anterior margin, followed by a square central orange spot and by a central pale band, more or less broken 
‘up into chevrons, to the spinners. In the posterior half are two longitudinal, black, marginal spots, in 
connection with a pair of circularly curved, parenthetical, white bands, often broken in the middle and 
forming four separate, short, white bars. Ventral area dusky white. Legs yellow-brown, first pair 
darker, to 
Vulva consisting of a pair of circular discs, in contact on their inner margins, each with a spiral internal duct, 
coiled from right to left, starting at the centre of the right disc (seen from below) and vice versa with the 
other disc. Protarsi i. and ii. with lateral spines on both sides; tibia i. with lateral spine on the inner 
side; tibize ili. and iv. with small dorsal basal spines. 
Hab. Mexico, Atoyac in Vera Cruz (H. H. Smith); Guatemaua (Sarg), Guatemala 
city (Stol/). 
The pattern on the abdomen is very similar to that of S. flavida, S. albicincta, and 
S. voluta, with the exception of the central orange patch. This species is probably 
identical with Jotus (Dynamius) opimus, Peckh., though whether also agreeing with 
Banks’s identification of the same species it is impossible to say. 
20. Sidusa albicincta, sp.n. (Tab. XVII. figg. 2,2a-d, 3; 3,3a,2.) . 
Type g, gynetype 2, in coll. Godman & Salvin. Total length, ¢ 5, ? 6 millim. 
3 2. Carapace brown, with a pale spot of hairs between the lateral eyes, two pale spots on each side of the 
central stria, and a posterior marginal band of white scales. Abdomen brown, with a black anterior 
marginal band. followed by a thin encircling white line extending obliquely a little down the sides; a 
pair of oblique white spots lie above the spinners and are connected with a circular transverse narrow 
white cincture just behind the middle. Ventral area pale or suffused with dusky brown. Legs yellow, 
more or less suffused with brown. 
Tibia and protarsus i. with lateral spines on each side ; tibie iii. and iv. with a small dorsal basal spine. 
Vulva consisting of a pair of oval-circular discs in contact on their inner margins, touching the genital rima, 
with a pair of posterior spermathecal spots, each connected with a dark angularly curved duct appearing 
in the centre of each disc; and a pair of larger, somewhat circular, dark spots appear just beneath the 
anterior margin. The palpus of the male is very similar to others of the group, very like that of 
S. flavida, but the tibial spur is very long and slender, and the apex of the bulbal spine more or less 
clavate. 
Hab. Guatemaa (Sarg); Panama, Bugaba (Champion). 
21. Sidusa parvula. (Tab. XVII. figg. 4, 3; 5, 2.) 
Escambia parvula, Peckh. Occas. Papers Nat. Hist. Soc. Wise. iii. 1, p. 44, t. 3. figg. 4, 45 (¢), 
4a,4c (2) (April 1896) *. 
Type d, gynetype 2, in coll. Peckham. Total length, ¢ 5, 2 6 millim. 
Hab. GuateMata, Eastern district 1. 
It is curious that this species should not occur in our collection, but no example 
with the palpal spine as depicted on the Plate has yet come before me. In the female 
of S. albicincta the vulva very much resembles that of S. parvula (Emerton’s figure), 
but there are decided differences. Our figures are taken from Peckham’s work. 
