NATURAL SCIENCES OP PHILADELPHIA. 11 



S. cas t a ne ic e ps , nobis. 



S. viridis, capite antennisque castaneis ; segmentis margin eposteriore caeruleo 

 tincto ; antennis 25 articulatis ; dente mandibulari producto, gracile; dentibus 

 labialibus 10, intirnis tribus utrinque coadunatis; pedibus plerumque luteolis ; 

 postremis saturate viridibus, articulo basali intus quinquespinoso, subtus spinis 

 9serie triplici dispositis ; appendicibus analibus lateralibus brunneis, elongatis, 

 singula spini3 apicalibus 5; superficie ventrali sordide viride. Long. unc. 3"75. 



Prebasilar fold connate with basilar segment; the suture, however, well 

 marked, existing as a deep groove. First pair of legs tinged with chestnut. 

 Preanal scale quadrate, much narrowed posteriorly, impressed with a longitu- 

 dinal sulcus. 



HaL Texas. Dr. Rand. 



S. polymorpha, nobis. 



S. olivaceo-brunnea, capite dilute castaneo; antennis 30 articulatis, pedi- 

 busque luteolis ; dente mandibulari tuberculo basali magno ; dentibus labiali- 

 bus 8, maximis, intimis duobus utrinque coadunatis, externis sejunctis ; segmen- 

 ts margine posteriore nigro-viride, marginis lateralibus plerumque liberis ; 

 pedibus postremis robustis, articulo basali intus 7-10 spinis, subtus 8-12 spinis 

 araato, processu angulari aut bifido aut trifido aut quadrifido ; appendicibus 

 analibus lateralibus, singula 4-5 spinis apicalibus. Long. unc. 3. 



Prebasilar fold apparent, but connate with the rather large basilar segment. 

 First segment of body very small, suture between scutum and episcutum barely 

 traceable, that between sternum and episternum much more distinct. Basal joint 

 of last pair of legs, above flattened and apparently grooved, below very convex ; 

 the internal surface having near to its proximal end a group of from five to seven 

 spines, and several scattered ones on its distal portion ; lower surface with from 

 eight to ten spines disposed 1 in rows. This may be considered the typical ar- 

 rangement, but we have very numerous departures from it; in some individuals 

 the 3pines are irregularly scatttered over the whole interior and inferior surfaces. 

 The color also varies greatly, shading off from that given above, to a testaceous- 

 chestnut, the posterior green bands entirely vanishing. Even the characters drawn 

 from the labial teeth are not constant in this perplexing species, these organs in 

 some individuals being small and coadnate. One of our testaceous specimens 

 has attained to the length of three and one-half inches. 

 Hah. Fort Riley, Kansas. Presented by Dr. Hammond. 



S. prasinipes, nobis. 



S. obscure nigro-viridis, segmento cephalico cordato, basali magno ; capite 

 subtus rufo ; pedibus, postremis exceptis, antennisque laete prasinis ; mandibulis 

 runs, dente magno ; dentibus labialibus 6, intimis duobus utrinque latis, coadu- 

 natis, externo acuto, sejuncto; pedibus postremis, singula articulo basali rufo, 

 multispinoso, processu angulari 4-5 spinis armato ; appendicibus analibus later- 

 alibus elongatis, singula 4-5 spinis. Long. unc. 10'25. 



Dental plates small, quadrate, punctate. Suture between scuta and episcuta 

 well marked. Distal extremity of the femoral joints of all the anterior legs 

 with from three to four spines, of the metatarsae with one. First joint of pos- 

 terior pair of legs the longest, somewhat flattened above. Preanal scale quad- 

 rate, much narrowed posteriorly. 



Hab. Island of Trinidad. 



S. e p il e p t ic a, nobis. 



S. rufo-castanea, robusta, capite segmento basali maximo ; dente mandibulari 

 magno ; dentibus labialibus 8, internis tribus utrinque valde coadunatis; an- 

 tennis 17 articulatis, elongatis ; scuta terminali media subcarinata; superficie 

 ventrali laete castanea; pedibus plerumque luteolis; postremis magnis, articulo 

 basali spinis validis 20-25, processu angulari magno, multifido, articulo 

 tibiali spinis 1-3 ; appendicibus analibus lateralibus minute punctatis, singula 

 spinis apicalibus 5-7 ; squama preanali elongata. Long. unc. 9. 



1861.] 



