RALPH V. CHAMBERLIN 189 



over the entire surface, these rather irreguh^rly arranged but referable to 

 5 (or 6) transverse rows. 



Second tergite with keels horizontal and of good size, longer than median 

 portion of metazonite, bent a little cephalad. Anterior margin of keel 

 nearly straight, the anterior angle subrectangular and the caudal one simi- 

 lar but a little rounded; lateral teeth 5, or 1 of these subcaudal in position, 

 the teeth on caudal side of keel 3, 3 transverse rows of tubercles. 



The immediately succeeding tergites similar to the second, but the keels 

 shorter and not bent forwards ; the caudolateral angles also becoming more 

 and more rounded or obliterated as such so that the lateral and caudal 

 margins together form an even and continuous curve; the anterior angle 

 subacute. The 3 teeth referable to lateral edge smaller than those properly 

 belonging to the caudal edge. The more caudal plates with anterior mar- 

 gin of keels becoming more and more convex and slanting more caudad, 

 the anterior angle becoming rounded while the caudal angle reappears 

 and becomes more and more acute, in the last 2 or 3 plates rather conspicu- 

 ously produced caudad. 



Anal scutum with process bluntly rounded; bearing the usual 2 setigerous 

 tubercles. Dorsal surface with numerous setigerous tubercles. 



Anal valves distinctly margined mesally. Lateral margins substraight. 

 A large setigerous tubercle just ectad of middle of mesal margin on each 

 valve. 



Gonopods of male in general similar to those of flngellaius but the longer 

 ventral rod at proximal end bent ectad instead of mesad and distally not 

 evenly curving, but ending in an abruptly more slender falciform division 

 as shown in the figure. Stile extending distad and not bending proximad 

 in the more usual way. 



Length 9 ? near 9 mm.; width, L.5 mm. Of cf cf near 7 mm.; width 1-|- 

 mm. 



Locality. — Jiuin Vinas: Laguna (elevation 3300 ft. October 1, 

 1909). Numerous specimens taken under a log, some noted as 

 pairing. 



In color and size very similar to P. flageUatus but more slender; 

 gonopods especially differing conspicuously as above noted. 



PLATYRACHIDAE 

 Platyrachus montivagus Carl 



One male from the Reventazon Valley, near Cachi (March 6, 

 1910). 



Described from Costa Rica originally, and previously recorded 

 from several localities in that country. 



Platyrachus antius sp. nov. 



Dorsum black, with keels yellow, the black extending more or less along 

 caudal margin of keels, the dark band in part may be of deep chocolate 



TRANS. AM. ENT. SOC, XL. 



