266 PROCEEDINGS OF THE ACADEMY OF [March, 



diameter of one of its lateral eyes, its middle eyes slightly nearer to the 

 lateral eyes than to each other, about double the size of the lateral 

 and placed a little higher. Eyes of the second row very large, separated 

 from each other by about four-fifths their diameter. Third eye row 

 slightly wider than the second. Length of dorsal eye area to cephalo- 

 thorax as 1 : 4.5. Quadrilateral of the posterior eyes broader than 

 long. 



Form. — Cephalothorax in front less than one-half its greatest trans- 

 verse diameter, low and flattened above, highest just anterior to the 

 middle, its posterior declivity describing an angle of 45° with its dorsal 

 contour. Sides of head vertical. Chehcera with 3 pairs of teeth, 

 shorter than the wadth of the clypeus, their length about 1.5 times 

 the height of the head in front. Posterior spinnerets about 1.5 times 

 as long as the anterior, with the terminal joint longer than wide. 

 Labium about as broad as long, rounded apically. Metatarsus W 

 shorter than patella and tibia combined. Length of leg IV to cephalo- 

 thorax ( 9 ) as 3.4 : 1. The first two eye rows project forward beyond 

 the clypeus. 9 palpal claw with 6 fine teeth. 



Comparisons. — This minute species agrees essentially with Simon's 

 (1898a) diagnosis of Aulonia, except that the first row of eyes is less 

 strongly procurved. It differs from Pirata, as I define it, in the sides 

 of the head being vertical, and the labium being no longer than wide. 



Genus TRAB^SIA Simon, 1S76. 

 Trabaea aurantiaca (Emert.). PL XX, figs. 31, 32. 



Aulonia aurantiaca Emerton, 1S85. 

 Trabcea aurantiaca (Emerton), Simon, 1898. 



(1 c? from Massachusetts, collected by Mr. Emert on.) 

 Eyes. — First row shorter than the second, eyes equal, middle eyes 

 nearer to each other than to the lateral and higher than the latter. 

 Eyes of the second row very large, on prominences, slightly less than 

 their diameter apart. Third row slightly wider than the second, its 

 eyes on prominences and directed backward. Dorsal eye area fully 

 one-third the length of the cephalothorax. Quadrilateral of the pos- 

 terior eyes as long as broad. 



Form. — Cephalothorax in front truncated and almost one-half its 

 greatest transverse diameter, the cephahc portion projecting forward 

 beyond the clypeus, highest at the ocular area. The sides of the head 

 vertical, head narrower at the clypeus than at the level of the eyes of 

 the second row. Chelicera with 3 pairs of teeth (not 2 as stated by 

 Simon, lS9Sa), slender and weak, their length less than the greatest 

 height of the head, but greater than the width of the clypeus. Labium 



