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PLATE XXI. 
Acanthoctenus Marshi F. Cambridge. Epigynum. 
Qrchestina saltabunda Simon. Male palpus. 
Idem. Side view of spider without legs. 
Melanophora rufula Banks. Male palpus. 
Spermophora meridionalis Hentz. Male palpus. 
Theridionexus cavernicolus sp. nov. Male palpus. 
Idem. Epigynum. 
Alcimosphenus bifurcatus sp. nov. Young female. 
Micrathena horrida Taczanovsky. Epigynum and lungs. 
Idem. Abdomen from above. 
Idem. Side view of abdomen. 
Micrathena oblonga Taczanovsky. Epigynum. 
Idem. Side view of abdomen. 
Micrathena sordida Taczanovsky. Epigynum and lungs. 
Idem. Side view of abdomen. 
Micrathena Vigorsii Perty. Sternum. , 
Idem. Epigynum and lungs. 
Idem. Abdomen from behind. 
Idem. Side view of abdomen. 
