194 



THE MYRIAI'ODA OF NORTH AMERICA. 



cies ! I have examined the types of Ileasia spinosa, and there can be no donbt as to its 

 identity. 



I have seen a single specimen, a female, labelled as coming from New Grenada, which 

 apparently belongs to this species. 



II,, h. Eastern United States. 



S. CVESIOANNULATIIS. 



S. brunneus, cuesioannulatus ; segmentis 82, singulo serie punetorum distantum ornato. 

 S. brown, annulate with gray; segments 32, each with a series of distant puneta. 



The general color of this curious Myriapod is light brown, but on each scutum is a 

 broad gray annulus. The anterior surface of the head is hollowed out at the position of 

 the ocelli ; in front of these the sides are straight and converging. The inferior margin 

 is rather deeply emarginate. The basal portion of the mandibles on each side project, so 

 that if a vertical section of the head through the middle were taken it would be an 

 oval with its greater diameter transverse. The eyes are in strictly triangular patches, 

 with remarkably straight sides. The scuta are so deeply canaliculate along their dorsal 

 centre as to be almost divided into two parts. The dorsum is not perfectly rounded, but 

 there is somewhat of a ridge or angle in the centre. Each scutum is furnished with a 

 regular series of distant large puneta, or perhaps more properly, pores. Three cylindrical, 

 transparent spinules, project from the posterior border of the last scutum. There is a 

 single specimen, a female, in the Smithsonian Museum, — it measures about an inch in 

 length, and was found by Mr. Robert J. Walker in Alleghany County, Pennsylvania. 

 This species ought perhaps to be the type of a new genus ; but, as I am unable to 

 make out the generic characters in this family, it seems preferable to retain it in this 

 for the present. 



Fam. II. IULID^E. 



Subsegmentorum posticorum sterna subnulla, subsegmentorum anticorum sterna raodica et ilia et haec cum scutis 

 arete conjuncta. Scuta Iaminis lateralibus baud instructa. 



Sterna of the posterior subsogments almost absent, of the anterior moderate, both closely conjoined with the 

 scuta. Scuta not furnished with lateral lamina. 



The head in this family is moderately large, and generally has the organs of special 

 sense; well developed. The eyes are present in all our American species, arranged in 

 variously shaped patches, near to the base of the antenna*. The latter are sometimes 



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