ABT. 8. MILLIPEDS OF CENTRAL AMERICA CHAMBERLIN. 15 



but clearly in front of middle of metazonite. Striae immediately 

 below pore weaker and incomplete. Anal tergite not covering valves, 

 obtusely rounded behind; surface densely reticulo-rugose and punc- 

 tate, with a shallow transverse depression in front of caudal end. 

 Vah'es with margins compressed and elevated ; surface densely finely 

 punctate. Anal sternite very obtusely angled behind, wide, and short. 



Gonopods shown in plate 7, figure 4. 



Number of segments, 65 to 69. 



Length, up to about 100 mm. ; width, from 5 to 6 mm. 



Locality. — Costa Rica: Santo Domingo de San Mateo, several 

 males and females (W. R. Maxon, May 16, 1906). 



Type.— C'3it. No. 825, U.S.N.M. 



May be distinguished from G. laetus in not having the rugae so 

 sharply defined and not so dominantly longitudinal, as well as in 

 the clearly different form of the gonopods. It is a larger and darker 

 form, with legs dark reddish brown instead of light yellowish. 



Genus ORTHOPORUS Silvestri. 



29. ORTHOPORUS ABSCONSUS, new species. 



Plate 7, figs. .'>-8. 



General color fuscous, with the paler annuli in the type not pro- 

 nounced. A fine sulcus across vertex joining a transverse line be- 

 tween angles of eyes. No median sulcus below. The frontal and 

 clypeal region roughened with coriarious impressions. Eyes sepa- 

 rated by their longer diameter; mesal angle acute. Collum not truly 

 inflexed below; on each side with six or seven striae, of which the 

 uppermost is limited below by a pronounced ridge, the others with 

 limiting lower edges weaker (pi. 7, fig. 5). Dorsal region of seg- 

 ments in general densely and strongly punctate, both in front of 

 and behind the sulcus, the latter cross ribbed. Striae on sides and 

 below sharply impressed across metazonite. Anal tergite not cover- 

 ing the valves; obtusely angled behind; surface densely coarsely 

 punctate and puncto-rugose. The valves similarly roughened. Anal 

 scale as shown in plate 7, fig. 6. 



Most readily recognized by form of gonopods, as represented in 

 plate 7, figures 7 and 8. 



The number of segments is uncertain, as the type was broken into 

 pieces mingled with those of other specimens; but it is probably 

 near 69. 



Width, 4 mm. 



Locality. — Costa Rica : Santo Domingo de San Mateo, Pacific side, 

 one male in vial with specimens of G. laetus (W. R. Maxon). 



7>pe.— Cat. No. 826, U.S.N.M. 



