MALLOS. 309 
hinder part, and is blackish on its margin; it recalls strongly the characteristic marking, on the same 
part, of some spiders of the genus Amuurobius; at the hinder end of the abdomen are two transverse, 
prominent, truncated, somewhat spinner-like, clear white projections close side by side to each other and 
clothed with white hairs; they are close above the anal prominence, and have the superficial appearance 
of short spinners, and under a 3-in. objective look as if segmentate; on each side a little forwards are 
two more such prominences of smaller size, and as if seated along the edge of a projecting ridge of the 
abdomen, The sides are white; the underside black, covered with short grey hairs. 
The basal half of the inferior pair of spinners has, in the middle, a large patch of spines and long bristles, 
whose function is, presumably, to card out the adhesive silk from the infra-mamillary organ; at any 
rate they are exactly situated for such a function. 
Hab. Mexico, Amula in Guerrero (/7. Hl. Smith). 
The affinities of this remarkable spider are evidently with Amaurobius and its 
congeners, but it differs in some very strong respects. Although immature, I have 
no hesitation in making it the type of a new genus. 
BIOL. CENTR.-AMER., Arachn. Aran., August 1902. 2 sf 
