1878.] 317 [Weyenbergh- 



being surrounded by a thick border more or less irregularly nacreous. 

 On every segment are also some nacreous tubercles ; three or four 

 on the first and second segment, more or less paired ; on either side 

 of the third are : first two large ones, then two small ones, and (hen 

 again two larger ones, forming together an irregular transverse row ; 

 on the fourth are only two such pearls on either side, and on. the fifth 

 four or five small ones, placed a little more outwardl\ r , and also form- 

 ing a row. In the middle of this segment is observed a spine directed 

 backwards, and of the same size as the spine between the eyes; on 

 either side of this spine is another small one, occupying the place of 

 the first pearl of the transverse row mentioned. The position of 

 these pearls does not seem to be always symmetrical. 



The body is nearly triangular in form, or better, sphaero-triangular, 

 and accords in its main features with P. granulatus Koch, 1 although 

 in that species there are more pearls, arranged in a different position; 

 so, too, the spines of the las* segment are not observed in Koeh's spe- 

 cies, which is smaller than our P. mesopotamogalis. 



The abdominal segments are small, with yellow borders, and par- 

 tially cover one another. On the posterior border of the dorsal face 

 of the first two of these segments are seven or eight pearls. The 

 genital organs form a small knot next the inside of the coxa? of the 

 hind leg. The front portion of the ventral face is lighter than the 

 hinder part, occupied by the thick coxas; this part is brown. Around 

 the mouth the color is very light. Seen from the under side, the 

 general form is more triangular than from above. 



Having spoken already of the first three legs, I will describe in 

 even greater detail the large hind legs. The coxae are very thick and 

 smooth, with a kind of keel between them on the ventral side, col- 

 ored brown, and on the back side black, with a thick, bifurcated 

 spine or knot upon the articulation with the trochanter, to which 

 corresponds a smaller spine with only one point on the trochanter 

 itself. The trochanter is short, thick and black, with a yellow ring 

 at either extremity, confluent on the inner side; at the upper end 

 (ventral face) is a pair of small spines, or rather, bristles. The 



*Cf. Kochu Kollfir. Die Arachn. T. vi., p. 20, tab. cexxr., fig. 548. — Koch. 

 Uebers. d. Arachn. Syst. II, p. 13. — Guerin. Icon. It. Anim.-Apt., p. 12, pi. 4, 

 fig. 5 (Gonyleptes curvipes).- — Gerv ais in: Walckenaer. Apt. T. hi, p. 1U4. pi. 

 46, fig. 1. — (Jay. Hist, fisica y polit. de Chile. Zool. T. iv, p. 20. Atlas. Araen. 

 lam. i. fig. 5, 6. (Gov yleptes chit '.ensis).—Thorell. Sabre alg. araen. <1. 1. Kopubl, 

 Argent, in: Periodico Zodlog. Argent. T. u., p. 211.— Td. Bolctin d. 1. Acad. 

 •Nac. Argent. T. 2, p. 265. 



