1920.] NATURAL SCIENCES OF PHILADELPHIA. 353 



Explanation to Plate XIII. 



Fig. 1. — Purex formosus new species, cf, type. Gourdonville, French Guiana. 

 Dorsal view of ultimate tergite, pygidium and forceps. (X 7J^). 



Fig. 2. — Pitrex formosus new species, cf, type. Gourdonville, French Guiana. 

 Dorsal view of pygidium. (Greatly enlarged.) 



Fig. 3. — Vo.stox hrunneipennis (Serville). d^. Arcadia, Louisiana. Dorsal 

 view of pygidium. (Greatly enlarged.) (For comparison with figures 2 

 and 4.) 



Fig. 4. — Spongovostox herlandi new species, cf , type. Guatemala City, Guate- 

 mala. Dorsal view of pygidium. (Greatly enlarged.) 



Fig. 5. — Spongovostox asemus new species, cf, type. San Ignacio, Misiones, 

 Argentina. Dorsal view of ultimate tergite, pygidium and forceps. (X 



12H). 

 Fig. 6. — Microvostox chopardi new species, cf, type. Nouveau Chantier, 



French Guiana. Dorsal view. (X 8^/^). 

 Fig. 7. — Microvostox chopardi new species. cT, type. Nouveau Chantier, 



French Guiana. Dorsal view of pygidium. (Greatly enlarged.) 

 Fig. 8. — Sparatta semirvfa Kirby. cf. St. Jean du Maroni, French Guiana. 



Dorsal view of ultimate tergite, pygidium and forceps. (X 7J^). 

 Fig. 9. — Parasparatta guyanensis new species, cf , type. St. Jean du Maroni, 



French Guiana. Dorsal view of ultimate tergite, pygidium and forceps. 



(X 103^). 

 y^ Fig. 10. — Parasparatta guyanensis new species. 9 , allotype. St. Jean du 



Maroni, French Guiana. Dorsal view of ultimate tergite, pygidium and 



forceps. (X 10 H)- 



