THE MYRIAPODA OF NORTH AMERICA. 



159 



TABLE SHOWING THE VARIATIONS IN SOME OF THE MORE IMPORTANT SPECIFIC CHARACTERS. 



Bab. Sonora, Kansas, N. Texas. 



S. VIRIDIS. 



S. viridi-brunnea ; segmento cephalico late ovato, sparse leviter punctato ; pedibus flavis ; antennis 23 articu- 

 latis, plerumque haud pubescentibus ; dentibus labialibus 8, duobus intimis utrinque arete coadunatis, externo 

 acuto, sejuncto; laminis deutalibus elongatis ; pedibus prostromis subeylindricis, modiee robustis ; articulo basali 

 tibiali longiore, supra subconvexo, margine baud elevato, intus 2 — 5 spinis, subtus 7 — 12 spinis in serie vel tri- 

 plici vel quadruplici dispositis, processu angulari 1- — 2 spinis; appendicibus analibus lateralibus profunde denseque 

 punctatis, interdum elongatis, singula spinis apicalibus 2 — 5,'et interdum altera marginale armata. 



Greenish-brown ; cephalic segment broadly ovate, sparsely lightly punctate; feet yellow ; antenna 23 articulate, 

 generally not pubescent; labial teeth 8, the inmost two on each side closely coadnate, the external acute, distant; 

 dental lamina elongate; last pair of feet subcylindrical, rather robust; basal joint longer than the tibial, above 

 convex, its margin not elevate, within 2 — 5 spines, below 7—12 spines arranged in a threefold or fourfold series, 

 angular process 1 — 2 spines; lateral anal appendages profoundly densely punctate, sometimes elongate, each 

 armed with 2 — 5 apical spines, and sometimes another marginal. 



* The typical number of rows is four. The variations from this are caused by some of the spines being a 

 fraction of a line from their normal position ; they generally may be placed in four crooked rows, 

 f Are the hind legs with the anal appendages the original ones, or are they reproduced? 



