14 PROCEEDINGS OF THE ACADEMY OP 



often composed of an aggregation of minute tubercles. Basal joint of last pair 

 of legs a little longer than tibial, the superior surface flattened, inferior convex, 

 raised margin not so prominent as that of the tibia. Breadth of preanal scale 

 rather great proportionably to its length. 

 Hab. Surinam. Dr. Calhoun. 



S. punctiscuta, nobis. 



S. olivacea, capite rufo-castaneo, segmentorum corporalium margine pos- 

 teriore et pleurumque anteriore viridis ; superficie ventrali castanea ; autennis 

 17 articulatis ; dentibus 8, parvis, nigris, intimi3 tribus utrinque valde coadu- 

 natis ; pedibus antennisque flavesceutibus ; pedis postremis articulo basali 

 supra bispinoso, intus sexspinoso, subtus septemspinosa, processu angulari 

 trifida ; tibial! articulo 5 spinis ; appendicibus analibus lateralibus punctatis, 

 elongatis, singula 3-4 spinis apicalibus et altero marginale armatis. Long, 

 unc 4-75. 



Cephalic as well as large basilar segment punctate, impressed with sutures, 

 between some of the plates, which are separate during embryonic life. Suture 

 between scuta and episcuta, and in one or two instances between the two true 

 scuta well marked. Scuta punctate and finely chased on posterior border. 

 Distal extremities of metatarsse of all anterior legs provided with a slender 

 spine ; claw armed with a small one near its base. Preanal scale quadrate, nar- 

 rowed posteriorly. 



Hab. Caraccas. W. G. Boulton, Esq. 



S. puncticeps, nobis. 



S. brunneo olivacea; segmento basali maximo ; antennis 17 articulatis; 

 dente mandibulari magno, robusto; dentibus labialibus 6, validibus, intimis 

 duobus utrinque coadunatis, extimo sejuncto ; laminis dentalibus excavatis ; 

 pedibus postremis elongatis, articulo femorali spinis 15-20, processu angulari 

 trifido, articulo tibiali spinulis 3-5 : appendicibus analibus lateralibus saturate 

 brunneis, singula spinis apicalibus 2-3 et interdum altero marginale. . Long. 

 inc. 4 5. 



Cephalic segment punctate: prebasilar fold connate with basilar segment, the 

 line of junction, however, indicated by a deep furrow in the latter. First seg- 

 ment the smallest, the third next. Suture between the scuta and episcuta, 

 well marked in middle segments of the body. Distal extremities of the femoral 

 joints of the nineteenth and twentieth pairs of legs provided with from two to 

 four small spines. 



Hab. Unknown. 



S. a tra , nobis. 



S. brunneo-atra, segmento cephalico magno, prebasali nullo, basali maximo ; 

 dente mandibulari maximo ; dentibus labialibus 12, conicis, vix coadunatis; 

 pedibus postremis gracilibus, articulo femorali spinis 4-5armato; appendicibus 

 analibus lateralibus elongatis, singula spinis apicalibus 2. Long. unc. 4-75. 



Color of whole animal brownish black with an almost metallic reflection on 

 the back and a reddish tinge about the head. The scutal plate of preterminal 

 segment is very large, equalling any other in size. Preanal scale impressed 

 with a longitudinal sulcus, its posterior border greatly rounded. 



Hab. Unknown. 



S. plumbeolatns, nobis. 



S- olivaceo-brunnea, segmento cephalico obscure castaneo, prebasali nullo. 

 basali magno ; dente mandibulari magno, gracile ; dentibus labialibus 10, par- 

 vis, nigris ; antennis 18 articulatis, sordide luteolis : lateribus plumbeis; pedi- 

 bus postremis gracilibus, articulo femorali 5 spinis, processu angulari interdum 

 bifido ; appendicibus analibus lateralibus punctatis, spinis apicalibus utrinque 

 duobus. Long. ubc. 4. 



First, third and fifth segments the smallest. Posterior margin of some of 



t/ all. 



