196 ARANEIDEA. 
8, Amycus spiralifer, sp.n. (Tab. XV. figg. 2, 2a-e, 3.) 
Type, ¢, in coll, Godman & Salvin. Total length 7 millim. 
Hab. Guatemata (Sarg). 
This species, which was accidentally omitted from the Table (on p. 192), may be 
recognized at once by the stout spur or cusp on the outer anterior margin of the 
mandible and by the long spiraloid spine encircling the palpal bulb. The mandibles 
have a tuft of white hairs at the base in front. 
SIDUSA. 
Jotus, Peckham, Proc. Nat. Hist. Soc. Wisc. 1885, p. 71 (Dec.) (nec Keyserling). 
Sidusa, Peckham, Occas. Papers Nat. Hist. Soc. Wise. ii. 8, p. 175 (Dec. 1895). 
Chapodu, Peckham, Occas. Papers Nat. Hist. Soc. Wisc. iii. 1, p. 26 (April 1896). 
Escambia, Peckham, tom. cit. p. 41 (April 1896). . 
Dynamius, Peckham, tom. cit. p. 12 (April 1896). 
Type of Sidusa, S. gratiosa, Peckh., Amazons; of Chapoda, C._festiva, Peckh., Guatemala ; of Escambia, 
E. conspecta, Peckh., Guatemala. 
I do not know the type-species of Sidusa, but S. recondita occurs in our collection. 
I am quite unable to find any definite characters to distinguish the genera here 
included under Sidwsa. Peckham originally placed the genus under the Homalattee, 
on account of the posterior eyes being on the margin of the carapace and giving ita 
broader appearance. But if S. recondita be a Homalattid, so also is Chapoda festiva 
and C. sulphurea for the same reason; neither can one eventually keep out all the 
Escambie, since they present every grade in the position of the posterior eyes and 
in the declivity or otherwise of the posterior portion of the carapace. If Jotus 
opimus of Peckham be really congeneric with Keyserling’s type of Jotus, from 
Australia, then this name will have priority over Sidusa. 
The following characters are common to the various species included :— 
Eyes of anterior row forming a line straight by the posterior margins or slightly recurved; laterals half the 
diameter of the centrals. Cephalic quadrangle broader than long, but variable, usually somewhat wider 
in front. Posterior eyes sometimes marginal, sometimes submarginal; small eyes either midway or 
nearer the anterior or posterior laterals. Carapace, in profile, sloping downward more or less abruptly 
behind the posterior eyes, or prolonged behind these eyes, and gradually declivous to the posterior margin. 
Tibia i. with 2—2—2 spines beneath, the last pair being basal, and the basal spine on the inner side 
sometimes absent, with or without lateral spines. Protarsus i. with 2—2 spines beneath, and with or 
without laterals. Patelle i., ii., iii., and iv. with spines on each side, or absent or only one on i. and ii. 
Tibie i. and ii. very seldom with, and iii. and iv. with or without, a small dorsal basal spine. Protarsi iii. 
and iv. with three rings of spines—a basal, median, and apical group. Sternum varying from circular to 
being twice longer than broad. Anterior coxs wide apart, so that the sternum is usually broad in front. 
Abdomen oval or elongate-oval; spinners long, slender, medians scarcely shorter than the posteriors, 
anterior pair stouter. Tarsus and bulb of male palpus elongate, the latter often produced basally, with an 
apical palpal spine, slender or sometimes stouter, circularly or spirally curved. Mandibles short, straight, 
vertical, with a large broad tooth beneath (but variable) and two smaller ones above. 
