NATURAL SCIENCES OF PHILADELPHIA. 13 



utrinque bispinoso. processu angulari simplice ; appendicibus analibus laterali- 

 bus punctatis, spina apicali interdum bifida. Long. unc. 4-5. 



The first segment of each pair is the smaller, until we reach the fourth 

 couple, where the order is reversed and so.continues to the end. The scuta of 

 the preterminal segment is remarkable for its size and has its posterior angles 

 rounded. The suture between the scuta and episcuta is obsolete, that between 

 the sternal and episternal plates very distinct. 



Hab. West Coast of Africa. Presented by John Cassin. 



? Var. gracilis. 



S. rephalicas similima, adhuc multo gracilior ; cephalico segmento et dente 

 mandibulari multo minoribus ; segmentis alternis minus inequalibus; dentibus 

 labialibus acutioribus. Long. unc. 5-75. 



Having but a single individual of each of these forms we prefer to retain this 

 as a variety, although it will perhaps be found to be a distinct species. The 

 two specimens are very different in their general appearance, but agree re- 

 markably in their minute characteristics. 



Hab. With the last. Presented by John Cassin. 



8. parvidens, nobis. 



S. olivaceo-viridis ; segmento cephalico, antennis pedibusqueluteolis ; segmen- 

 to prebasali nullo, basali magno ; dentibus 10, parvis; pedum postremum arti- 

 culo basali spinis 4-6 armato, processu angulari elongato, bifido vel trifido ; ap- 

 pendicibus analibus lateralibus luteolis, punctatis, singula spinis apicalibus 

 2. Long. unc. 4. 



Head darker than antennae, feet, &c, mandibular tooth rather large. Ven- 

 trai surface drab. Sutures between sternal and episternal plates distinct. 

 Posterior margin of terminal scuta strongly arcuate. Femora of last pair of 

 legs longer than tibiae, superior surface flattened and in one of our specimens 

 slightly grooved. Preanal scale, quadrate, slightly narrowed posteriorly, pos- 

 terior margin rounded. 



Hab. Ningpoo, China. Dr. D. B. B. McCartee. 



S. torquata, nobis. 



S. dilute ochracea, capite segmentisque postremis rufis ; segmento prebasali 

 nullo, basali maximo; antennis 17 articulatis, laete luteis ; dente mandibulari 

 magno, dentibus labialibus 6, obtusis : segmentis postice dilute viride margi- 

 natis ; supei ficie ventrali pedibusque anterioi ibus luteis ; pedibus postremis 

 gracilibus, castaneis, articulo femorali elongato, 30-40 spinulis nigris armato, 

 processu angulari multifido. Long. unc. 4. 



First segment of body much the smallest; color of back approaches some- 

 what to a faded chestnut, the posterior segments losing the green margin, but 

 obtaining a much redder hue. Distal extremity of last pair of legs, 

 tiuged with olive green. Lateral anal appendages sub-quadrate, their posterior 

 margin rather sharp and provided with a minute black spine, their termi- 

 nal process provided with 7 similar ones. Suture between scuta and 

 episcuta better marked than that between sternum and episternum. Our 

 specimen is perhaps not an adult. 



Hab. Sombrero Island. 



S. p e 11 a, nobis. 



S. olivaceo-brunnea, capite castaneo, segmento prebasali nullo, segmento 

 basali maximo ; antennis 20 articulatis ; dente mandibulari magno; dentibus 

 labialibus 10, nigris, tribus internis utrinque valde coadunatis ; pedum postre- 

 morum articulo basali et secundo marginibus elevatis ; illo, margine interiore 

 4-5 spinis, superficie inferiore 8-9 spinis serie triplici dispositis, processu an- 

 gulari trifido vel quadrifido ; appendicibus analibus lateralibus punctatis, sin- 

 gula, 4-5 spinis apicalibus. Long. unc. 3. 



Dental lamina somewhat elongate. Basilar tubercle of mandibular tooth 



1861.] 



