1875.] 495 [Thorell. 



blackish. The legs are slender, the first pair the longest ; they are of 

 a brownish yellow color, with black spines ; the thighs of the first 

 pair have three spines, those of the two following pairs one spine 

 each; the thighs of the fourth pair are without spines. The metatarsi 

 of the first pair have at least four spines, three towards the base and 

 one towards the apex, those of the fourth pair at least two spines. 

 The abdomen is high, ovate, whitish above, with a large ovate-lanceo- 

 late or leaf-like band along the whole back; this band, which is at 

 least as broad as the cephalothorax, is at the sides formed of large 

 brownish black spots more or less united with each other ; inwardly, 

 between these two series of spots, the band becomes paler, grayish, 

 with a fine blackish, somewhat branched, longitudinal middle line. 

 Inferierly the sides of the abdomen are blackish with a series of two 

 or three whitish spots (or a longitudinal broken band) limiting the 

 black belly. The vulva consists of a transversal area more than 

 double as broad as long, strongly rounded in the sides; in front and 

 on the sides this area is bordered by a high, narrow margin; from the 

 middle of the anterior part of this margin proceeds backward a 

 rather broad, black process, by which the area is divided into two 

 large, deep, rounded foveas. The vulva thus has some resemblance 

 to an co. The mamillae are dark brown. 



Length of the body, 2.75 millims. ; length of cephalathorax, some- 

 what more than 1 millim., breadth rather more than .75 millim. 

 Length of first pair of legs, 5.5 millim.; second pair, 5 millim.; third, 

 3.5 millim.; fourth, 4.5 millim. ; patella and tibia of the fourth pair, 

 1.5 millim. 



Two male specimens, which probably belong to this species, are dis- 

 tinguished by their longer and narrower, black abdomen, and by their 

 clypeus, the height of which is nearly double the length of the 

 area of the central eyes. The length of the mandibles is not fully 

 half as great again as the height of the clypeus. The blackish brown 

 tarsal joint of the palpi towards the middle of the superior (exte- 

 rior) margin is elevated into a blunt tubercle ; its very base, on the 

 other side, is drawn out into a long, very fine, pale, spine-like process 

 curved forwards; the bulbus genitalis has on the under side, behind, 

 a very large reddish lamellar appendage, which inwards ends almost 

 in the form of a crescent; outwards it is cleft into two parts by a deep, 

 broad fissure, the anterior part being narrower than the other, di- 

 lated, emarginate and somewhat denticulated at the apex, the poste- 

 rior part still more dilated at the apex, which shows a few fine teeth 

 at the exterior angle ; towards the apex, near the inferior (interior) 



