— 135— 



mm. long. Marginal configuration as in P. carabivorus, except that the posterior 

 margin is strongly emarginate. Whole upper portion of ceph'x seems to be elevated, 

 showing quite a breadth of membrane which connects it with the coxae. Middle 

 portion of caput, perceptibly elevated and broadened a little caudad of the eyes. 

 Legs; 4th, 23.5 mm; 3rd, 19.25 mm; 2nd. 18.5 mm; 1st, 20 mm. In front of the 

 U-shaped depression the caput is emarginate, the depression extending for a short 

 distance cephalad in the median line. This is seen to a certain extent in some good 

 specimens of P. carabivorus. Otherwise as in P. carabivorus. 



Pachylomerus carolinensis, Hentz. 9> I specimen. (Plate V, figs. 2 and 

 3, and 20.) Beitrage zur Kenntniss der Territetarije, Ausserer, 1871, p. 147. Mygale 

 carolinensis, Hentz., Boston Joum. IV, p. 56. pi. VII, fig. 3. 



This specimen I am convinced is the same as the one described by Hentz as 

 Mygale carolinensis. The description is very imperfect, and I take this opportunity 

 of making it a little more complete, and easy to identify. His description is as 

 follows. "Brownish, very glossy; cephalothorax with two slight impressions near 

 the base; abdomen blackish, not glossy; third joint of the third pair of legs very short 

 and crooked; feet 4, I, 3, 2." The spinal armature is the same as in P. carabivorus, 

 but the ceph'x and arrangement of eyes are quite distinct. Ceph'x longer in pro- 

 portion to width than in P. carabivorus, 10 mm. x 8 mm. in this specimen. U-shaped 

 depression situated more than two-thirds the distance from anterior margin of caput, 

 making caput larger in proportion. In the curve of the U-shaped depression, there 

 is scarcely any depression; a very faintly depressed line, which is quite readily seen 

 because it is very dark, connects the two well marked depressions at the anterior ends 

 of the U. As Hentz's specimen was a small one, these depressions would be smaller 

 than in the specimen I have. Had it been a well marked U-shaped depression, he 

 would have noted it, as he has in the case of Mygale truncata. 1 



Caput caudad of eyes slightly elevated, making the slope quite steep. 



Radial depressions distinct, straight. Base of ceph'x 4 mm; angles not sharply 

 defined; lateral edge from posterior angle to point of greatest breadth curved, with 

 convexity outward, fig. 2, pi. V, represents the ceph'x of this species. By compar 

 ing it with fig. 1, can be seen the differences of the two species in the configuration 

 and markings. 2 Fig. 3 represents the eyes of P. carolinensis; fig. 4 of P. carabiv 

 orus; fig. 19 tarsal claw, spur at base with a small spine on each side at its base; 

 distad of this a spine divided at the end. Labium as long or longer than broad at base. 



Eyes. Ant- and post-laterals form a trapezium as in P. caribivorus, but the 

 ant-centrals are situated on a line halfway between the base of the trapezium and the 

 opposite side; the post-laterals and centrals forma curved line with convexity caudad, 

 instead of a straight line as in P. carabivorus. 



Sternum as broad as long, 5 mm., broadest part one-third from caudal end. 



Mygale solstilialis 3 . Hentz, I am inclined to think is the male 

 of this species. The depressions in the ceph'x are similar, the difference 

 in the lengths of the 2nd and 3rd pair of legs is not of much specific im- 

 portance in many species. The depressions on the abdomen are just 

 what will appear in any of these species, when the abdomen becomes 



1 Boston Journ. IV, p. 55. Spiders of the U.S. N. M. Hentz, p. 16, pi. I, f. 1. 



2 The curvature of the lateral radials I do not think is constant. 



3 Boston Journ. IV, p. 56. Spiders of the U.S. N. M. Hentz, p. 17, pi. 1, f. 3. 



