1869.] ^^^ [Cope. 



JTJLIDAE. 



Spikobolus agilis, Cope, sp. nov. 



This is the pigmy of the genus, and is not less distinguished by the 

 small number of its segments, and the greater activity of its movements. 

 The short antennae, and anteriorly produced second segment, are precisely 

 those of other species of the genus. 



Segments thirty-eight, smooth above, but with delicate, irregular 

 longitudinal striae below. Front higher than wide, smooth, not punc- 

 tate, but with a faint trace of median groove. Two rows of hairs on and 

 above the labral margin. Bristles of the legs weak. Preanal plate trans- 

 verse narrow elliptic. Antennas sparsely hairy. Total length, eight lines. 

 Color, wood-brown, with a reddish posterior marginal band to each seg- 

 ment ; front and antennse pink. 



Giles County, Va. 



Cambala annulata Cope, Julus annulatus Say, J. A. N. S., 1st, II., 

 103. Spirostreplwn Newport, Wood. ?'^ Julus lactarius Say" Gray et 

 Newport not of Say. Cavibala lactaria Gray and Newport. 



Gervais and Wood have pointed out the error of Gray and Newport in 

 regarding this animal as the the J. lactarius Say, but have not suspected 

 that it is the J. annulatus of the same author. The species is quite rare, 

 as I have seen but one specimen, which I took in the Spruce Run Cave on 

 the Kanawha River, in Giles Co., Va. It has considerable superficial 

 resemblance to the Spirostrephon lactarius, and is one of our most elegant 

 Myrapoda. In generic characters it has the second annulus of Julus, and 

 the short thick antennae of Spirobolus, but adds a speciality in the almost 

 obliteration of the visual organs. These are reduced to a single linear 

 series of not very distinct occelli immediately adjoining the margin of the 

 basilar segment on each side. 



Segments sixty-one ; color deep mahogany brown above. Total length 

 2 in. 2 lin. 



Say's description applies exactly to our specimen. It would not be 

 safe to insist that this is the Oamhala lactaria of Newport, but it most 

 probably belongs to the same genus, characterized by linear eye-patches. 



Julus montanus, Cope, sp. nov. 



This species is in most respects similar to the J. pennsylvanicus as 

 given by Wood. There are two impressions on the vertex ; the antennae 

 are elongate ; the last scutum is prolonged into a moderate straight mucro, 

 and the posterior segments are quite pilose. The color is a dark brown 

 with a series of blackish dots on each side. It differs from J. p e n n s y 1- 

 V aniens solely, so far as can be ascertained, in having 69 instead of 63 

 segments, and in the median portions of the same being smooth, and the 

 inferior portions closely many grooved, instead of having "above punctae 

 which give rise to obsolete grooves, ' ' Wood. 



Mountains of Giles and Montgomery Counties. 



POLTDESMID^, Latr. 

 POLYDESMUS VIRGINICUS. 

 POLYDESMUS CORRUGATUS, Wood. 



