194 COSTA RICAN MYRIAPODA 



Gonopods of male of usual type. Outer branch of distal division distally 

 truncate, not acute as in unicolor Carl. Inner branch (stile) not genicu- 

 late, not distally expanded in button-like form as in unicolor nor deeply 

 and unevenly notched as in lamellifer Brolemann (see figure). 



Seminal processes of second legs in male long and slender, distally acute. 



Length of type (c?') near 31 mm. ; width 5 mm. 



Locality. — Juan Vinas (June 23 to 29, 1910). One male. 

 Readily separated from other species by character of male 

 gonopods. 



EXPLANATION OF PLATE II 



Fig. 1. — Siphonophora costaricae sp. nov. Head and first two tergites, 

 dorsal view. 



" 2. — Rhinocricus plesius sp. nov. Distal portion of male gonopod. 



" 3. — Peridontodesmus electus sp. nov. Left gonopod of male, ventral 

 view. 



" 4. — Platyrachus antius sp. nov. Right keel of tenth segment, 

 dorsal view. 



" 5. — The same. Left gonopod of male, ectal view. 



" 6. — Aphelidesmus calverti sp. nov. Right gonopod of male, ven- 

 tral view. 



" 7. — The same. Left gonopod of male, lateral view. 



" 8. — Aphelidesrnus intermedius sp. nov. Right keel of fifteenth 

 segment, dorsal view. 



" 9. — The same. Last tergite. 



" 10. — " " Anal scale. 



" 11. — Aceratophyllus dux sp. nov. Left gonopod, ventral view. 



