192 COSTA RICAN MYRIAPODA 



Anal valves strongly margined as usual. 



Anal scale with caudal margin convex, weakly convexly protruding 

 between the setae and mesally slightly indented. 



Gonopods of male with stile arising on ectal side of distal division and 

 curving ventrad of it proximal of its middle, then running distad behind 

 (dorsad of) a thin plate-like division as shown in the figures. 



Genital processes on second legs of male very small, subconical. 



Length of type (cT) near 27 mm.; width 3.25 mm. 



Locality. — La Emilia (November 16, 1909). Named in honor 

 of Dr. Calvert. 



Aphelidesmus intermedius sp. nov. 



Deep chocolate brown, the outer portion of carinae and the caudal por- 

 tion of anal tergite light yellow. Antennae and legs pale brown. 



Head smooth. Sulcus across vertex deep; terminating abruptly' at level 

 of edge of antennal sockets. A long bristle springing from a light spot 

 just below base of each antenna and a transverse row of similar bristles 

 across clypeal region. 



Antennae inserted very close together, short. Sixth article much the 

 longest, the second and fifth, and the third and fourth, not much differing 

 in length, the first two slightly longer than the latter. 



First dorsal plate much wider than head. Surface finely and densely 

 granular. Anterior margin convex. Keels rather strongly bent down, 

 with anterior margin sloping back caudoectad; the caudal margin nearly 

 transverse, and the outer end of keel well rounded. 



Second dorsal plate with anterior corner of keel rounded, a small blunt 

 tooth on its outer side. Caudal corner subrectangular, but the caudal 

 margin extending a little caudad of ectad. Third and fourth plates nearly 

 like the second but marginal tooth farther caudad. Succeeding plates 

 lacking the small tooth, the anterior corner more strongly rounded, the side 

 from it rounding back obliquely a little ectad of caudad to the caudal cor- 

 ner which becomes rather strongly and acutely produced and spiniform. 

 Processes of nineteenth segment short. Surface of tergites from second cau- 

 dad showing polygonal areas marked off by paler lines but area not elevated 

 nor lines sulciform; one row of areas on prozonite and two on metazonite. 

 Margin of keel on pore-bearing segments strongly thickened with the pore 

 always strictly lateral in position. 



Anal tergite with sides strongly converging caudad, as in type species 

 of genus, with the caudal margin widely rounded though median portion 

 not very convex. 



Anal scale with caudal margin between setae wide and only very weakly 

 convex, nearly straight. 



Length ( 9 ) about 31 mm. ; width near 3.5 mm. 



Locality.— J uiin Vinas (June 23 to 29, 1910). The type is a 

 female. 



