ART. 8. MILLIPEDS OF CENTRAL AMERICA — CHAMBERLIN. 13 



Superfamily SPIROSTREPTOIDEA. 

 Family SPIROSTREPTIDAE. 



Genus GYMNOSTREPTUS Brblemann. 



26. GYMNOSTREPTUS LAETUS, new species. 



Plate 6, figs. 7-9. 



Dorsally the prozonite and anterior portion of metazonite olive or 

 in part of a somewhat bluish tinge, the jjosterior part of metazonite 

 banded with reddish brown or ferruginous. Legs light reddish 

 yellow. Sulcus present across vertex of head. Head Avith irregu- 

 larly impressed lines on each side adjacent to «ollum. Eyes trans- 

 versely elongate, angled at mesal ends. Ocelli in six series, as 11, 10, 

 9, 7, 5, 3. Collum not inflexed beneath, the lower anterior corner 

 less rounded than the lower posterior, the inferior margin weakly 

 convex. Above lower margin a series of four striae, the limiting 

 ridges of which end at the anterior marginal thickening, and typi- 

 cally a short stria between second and third that does not extend 

 forward to the middle, or with three striae above and two or three 

 shorter ones below them (pi. 6, fig. 7). The segments in general 

 have the metazonites dorsally strongly punctate and further rough- 

 ened with intervening anastamosing rugae. Prozonites also densely 

 punctate, but the punctae smaller on the average and the rugae less 

 developed. Metazonites longitudinally striate below pore, with the 

 upper striae short, not extending far from sulcus. Pore small, well 

 removed from sulcus. Anal tergite strongly roughened with 

 punctae and a close network of rugae, without distinct transverse 

 furrow. Anal valves exceeding the tergite; borders strongly com- 

 pressed and elevated. Anal sternite or scale short and broad, the 

 caudal side very obtusely angled (pi. 6, fig. 8). 



Gonopods of male as shown in plate 6, figure 9. 



Length, about 78 mm. ; width, 5 mm. 



Locality. — Guatemala : Joyabaj, one male and two females (O. F. 

 Cook, May, 1906). 



Tyye.—Q^i. No. 823, U.S.N.M. 



May readily be distinguished from vagans in having the tergites 

 strongly punctate as well as rugose instead of being rugose only, in 

 the greater distance of the segmental sulcus from the pore, in the 

 different form of the collum, and in the structure of the gonopods. 



27. GYMNOSTREPTUS VAGANS, new species. 



Plate 6, fig. 10; plate 7, fig. 1. 



The general color is grayish brown, with a caudal band of ferru- 

 ginous. Legs fulvous. Head smooth. Sulcus present only across 

 vertex. Eyes acutely angled at mesal ends, separated from each other 



