

C Y M T H I D E A. 769 



about half as long as the sixth joint, and somewhat gibbous below, 

 with a minute seta below in advance of the gibbosity, and another 

 above. The apex of the third and also that of the fourth joint is 

 mostly set around with spines, in part about as long as the breadth of 

 the joint at apex. The seventh pair is stouter and a little longer than 

 the sixth. 



Genus PTERELAS, Guerin. 



The specimen we refer to the genus Pterelas, has all the three 

 anterior pairs of legs subdidactyle, and the process on the penult joint 

 of the legs is hatchet-shape. It may, perhaps, be properly the type of 

 a new genus ; yet it seems to be preferable with our present knowledge 

 to modify the characteristic of Pterelas so as to include it, this genus 

 hitherto embracing only species having the second and third legs sub- 

 didactyle, while the first pair is ancoral simply. 



Pterelas magnificus. 



Corpus Iceve, sat angustum, ad abdominis basin non interruptum. Caput 

 transversum, oculis grandibus paulo remotis. Pedes 6 antici subdi- 

 dactyli, articuh penultimo processu lato axiniformi armato, articulo 

 Mo brevi, et spinibus brevibus infra armato, 8 postici spinulis paucis 

 appressis armati. Abdomen §-articulatum, segmentis 5 anticis sub- 

 cequis, ultimo subtriangulato, lateribus arcuate dilatatis, extremitate 

 mbacutd. Styli caudales abdomine parce longiores, basiproducto et 

 paulo breviore quam rami, ramis angustis, longitudine fere cequis, 

 externo angustiore, interno ad apicem extus dilatato. 



Body smooth, rather narrow, not interrupted at base of abdomen. 

 Head transverse, eyes large but rather remote. Six anterior feet 

 subdidactyle, the penult joint with a broad axiniform process ; third 

 joint short, and having a few very short spines on under surface. 

 Abdomen six-jointed, five anterior segments equal in length, last 

 subtriangular, with sides arcuately dilated, extremity subacute. 

 Caudal stylets slightly projecting beyond abdomen, base produced 

 and a little shorter than branches, branches narrow, equal, outer 

 narrowest, inner with apex dilated on outer side. 



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