Genera and Species o/" Scolopendridse. 225 



Stermtes smooth, strongly bisulcate. 



Anal somite. — Tergite with strongly raisfcl margins and a 

 median longitudinal sulcus ; pleurcB densely porous, narrow, 

 truncate, with one small spine in the middle of the posterior 

 border and one small one in the position of the process ; 

 sternite much longer than wide, nearly parallel-sided, with 

 obtusely rounded posterior angles ; legs short and thick ; femur 

 with a strongly developed bifid process, with two strong spines 

 on its upper inner edge, two smaller ones on its inner poste- 

 rior edge, three (two large and one small) on its under inner 

 edge, and about six on its inner surface ; patella flattened on 

 its inner surface, with an inferior posterior smooth promin- 

 ence ; the other segments cylindrical throughout; claw strong 

 but not carinate beneath. 



Legs with strong and strongly bicalcarate claws, the first 

 tarsal segment of all — with the exception of the first (? of the 

 second and third) and the twentieth — armed with a spur. 



Length about 50 millim. ; width of head 2*5, of anal tergite 

 3-3. 



A single specimen from Bahia {H.M.S. ^Challenger '). 



In most of its features this species closely resembles the 

 preceding. It differs, however, in having the proximal tarsal 

 segment of its legs armed beneath with a spur. 



The diagnosis of P. Thayeri^ Meinert (sub Rhoda), is too 

 brief for the satisfactory determination of the species. Con- 

 sequently either of the two here described may prove to be 

 synonymous with it. Dr. Meinert, however, says that there 

 are only two spines on the inner surface of tlie femur of the 

 anal leg, whereas in both of these forms there are from seven 

 to nine spines in this position. Ur. Meinert makes no mention 

 either of the spine-armature of the walking-legs or of the 

 presence or absence of sulci on the head and first tergite. 

 Another peculiarity of these two species is the large size of 

 the prescutal pieces of the tergites, especially in the hinder 

 half of the body. 



It is interesting to note the close similarity that exists 

 between the description of P. calcaratus and that of Scolopen- 

 dropsis bahiensis of Brandt, given by Gervais in vol. iv. of 

 the ' Insectes Apteres.' In fact, were it not for Gervais's 

 statement that Scolopendropsis possesses twenty-three pairs of 

 legs, I should have tiiought that the two descriptions applied 

 to the same species. 



PSEUDOCRYPTOPS, gen. nov. 

 Head-plate about as wide as long, narrowed anteriorly. 



not 



