Page:Wood 1865 - The Myriapoda of North America.djvu/29

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This species is closely allied to S. alternans, Leach, but differs from the characters given by Mr. Newport; first, in the mandibular tubercle (mandibular tooth of Newport), being very large and having the lesser tubercle near to its base; secondly, in the number of spines on the basal joint of last pair of legs being from 30—45 instead of from 45—60; and finally, by the roughness of the lateral anal appendages. Besides, the specimens agree in possessing important characters not mentioned by Mr. Newport, and which it is fair to conclude do not exist in his species.

The head and its appendages are very large and stout. The antennæ are generally lighter in color than the body. The first scutum is much the smallest. The lateral margins of the anterior scuta are straighter than those of the posterior, which are elevated. The posterior margin of the terminal scutum is very strongly arcuate. The scuto-episcutal sutures are traceable, but not so well marked as the sterno-episternal. The femur of the nineteenth pair of legs is furnished with two small spines on its distal extremity; that of the twentieth with one or two on its upper surface, and a well-marked terminal angular process supporting five small spines. The femur of the last pair is rather depressed than compressed, and armed with 30—45 small spines, irregularly arranged in rows on its upper, inner, and lower surfaces. The preanal scale is somewhat elongate, and narrowed posteriorly.

Hab. Florida.—Smithsonian Collection.

{{smaller block|{{sc|S. byssina.}}

S. saturate viridis aut brunnea; capite dilute castaneo, et Iabio mandibulisque sparse punctatra; segments cephalico late ovato, antice leviter emarginato, segmento prebasali nullo; antennis luteolis, 18 articulatis, pubescentibus; dente mandibulari gracile; laininis dentalibus latis; dentibus labialibus 10, parvis, nigris, utrinque tribus intimis coadunatis; pedibus gracilibus, luteolis, modice compressis ) pare posferemo supra complanato, subtus valde conveso, marginibus superioribus et externo et interno acutis } articulo basali tibiali longiore et intus et subtus bi- vel tri-spinoso, processu angulari bifido vel trifido; superficie ventrali brunneo-olivacea; appendicibus analibus lateralibus profunde dense punctatis, modice elongatis, singula spinis apicalibus 2—3, apicibus haud incurvatis.

Deep green or brown; head light chestnut, with the labium and mandibles sparsely punctate; cephalic segment broadly ovate, anteriorly slightly emarginate, prebasal segment wanting; antennæ yellowish, 18 articulate, pubescent; mandibular tooth slender; dental laminæ broad; labial teeth 10, small, black, the inner three on each side}}