NATURAL SCIENCES OF PHILADELPHIA. 15 



lored, and tipped with white. The lateral processes are small. The grooving 

 of the scuta is in some specimens somewhat obsolete on the dorsum. The 

 posterior scutum is light colored. I have never identified a male. 



Length, h to \ of an inch. 



Hub. Philadelphia. Dr. Joseph Leidy, Dr. H. C. Wood, Jr. Washington, 

 D. C. F. W. Putnam, Coll. Museum Comp. Zoology. 



Genus SPIROBOLUS. 



S. SPINIGERUS. 



S. fulvus, maculis saturate viridis maximis ornatus ; capite minute punc- 

 tato, infra punctorum magnorum serie instructo ; oculis suborbiculatis ; anten- 

 nis longis ; segmentis 48 ; scutis leviter sparse punctatis ; squama preanali 

 triangula. 



The color of this species is fulvous, often varying towards orange. On 

 each scutum there is a large dark-green transverse crescentic blotch. This 

 is often so wide superiorly as to involve the whole of the dorsum. In some 

 individuals there are lateral series of white blotches, and occasionally a 

 black line on each side. These are, however, not common. The head 

 has a strongly pronounced median furrow, and is greenish superiorly. The 

 eye spots are somewhat orbicular, with occasionally a tendency to become 

 tetra- or polygonal. The antennae are longer than in S. marginatus. The 

 scuta are not rough, and are very lightly or even obsoletely furrowed be- 

 neath. The spines on the inferior surface of legs are very numerous and 

 acute. The male genital appendages are formed of two main portions joined 

 together, as in 5. marginatus. The large plate of the main process is broad. 

 The upper border of its face has a wavy outline. Externally it is produeed 

 into an alar portion, which ends in a blunt process at right angles to it. The 

 inner piece is composed of a basilar and superior joint. The basilar is very 

 long. The other is curved, and presents on one aspect a strongly convex, on 

 the other a strongly concave surface. It ends in a blunt point, and is armed 

 with a large blunt process and an acute spine. The female genital append- 

 ages appear to consist on each side of a process deeply placed within 

 the body this is thin on its free margin, which is rounded, though some- 

 what acuminate below it is contracted and thickened. The three pairs of 

 feet immediately in front of the genital aperture in the male have their 

 coxae produced into long processes. These are often of a curious form, but 

 do not seem constant in this. The fourth and even fifth coxae have small 

 processes. 



Ilab. Florida. South Carolina. Smithsonian Institution. 



S. UNCIGERUS. 



S. laete brunneus, saturate-rubido-brunneo annulatus ; capite sparse mi- 

 nute punctato et corrugato, antico punctorum maximorum serie instructo ; 

 segmentis 50 53 ; scutis supra et copiose punctatis et corrugatis ; squama 

 anale triangu'a. 



The color of this species is a bright brown, with an annulus of dark red- 

 dish brown on the posterior border of each segment. The head is distinctly 

 medianly caualiculate, except in the centre, and has the row of dots on its 

 anterior face as in S. marginutus, but is not as decidedly punctate elsewhere 

 as in that species. The eyes are triangular. The antenna? closely resemble 

 those of S. marginatus, but are, perhaps, rather shorter and more compressed. 

 The first scutum is banded, both anteriorly and posteriorly. The lateral pro- 

 cesses, even the female, are almost wanting. The second scutum is produced 

 forwards as in S. marginatus. The male genital appendages are composed of 

 a yoke-like piece and two outer parts, which it connects. The central piece 

 may be described as formed by two plates (although but really one) meeting at 



1864] 



