156 THE MYRIAPODA OF NORTH AMERICA. 



Ti -i iceons ; cephalic segment subovate, minutely punctate; antennae 25 articulate ; mandibular teeth produced, 

 slender; labial teeth 8 — 10, the inmost two on each side generally eoadnate; feet generally yellowish; basal joint 

 of the last pair within with 5 — 7 spines, beneath 7 — 10 arranged in a threefold series, angular process with 

 3 — 10 spines; lateral anal appendages elongate, minutely profoundly punctate, with 5 — 7 apical, and a marginal 

 spine on each. 



S. UF.if is, Girard, Marcy's Report of Explorations on the Red River, p. 27"2, pi. xviii. 

 " " Wood, Journ. A. N. S., new series, vol. v, 1863, p. 18. 



Var. Casta.veiceps. 



S. viridis; capite antennisque rubro-castaneis ; pedibus plerumque luteolis, interdum viridibus ; paris postremi 

 articulis basalibns saturate viridibus. 



1 1 reen ; head and antennaa reddish chestnut ; feet generally yellowish, sometimes green ; basal joints of last pair 

 very deep green. 



S. castaneiceps, Wood, Proc. A. N. S., 1861, p. 11 ; Journ. A. N. S., new series, 1863, vol. v, p. 18. 



The prebasilar fold is connate with the basilar segment, the suture is generally, how- 

 ever, well marked, existing as a deep groove. The cephalic segment is slightly emar- 

 ginate between the antenna?. The labial teeth vary from 8 — 10 in number; there will 

 sometimes be four on one side and five on the other, the external tooth apparently being 

 the missing one. The antennae are 25-jointed. Out of nearly a hundred specimens that 

 I have examined, only two or three had one or two supernumerary joints developed. 

 The scuta arc polished, generally minutely and sparsely punctate, often obscurely bicari- 

 nate, the posterior with their lateral margins elevated. The last pair of legs are rather 

 robust, with the basal joint longer than the tibial. The scuto-episcutal sutures are appa- 

 rent, the sterno-episternal very well marked. Length 54 inches. 



II" 1 ' Georgia, Alabama, Louisiana, Texas, New Mexico, &c. 



