270 Annals of the Carnegie Museum. 



Plate IV. 



Figs. 58-67. Left mesostigmal lamina of females of species of Argia and Di- 

 argia, viewed from in front. 



58. Argia fosleri, sp. nov., 9 . Sapucay. 



59. Argia hasemani, sp. nov., 9> Bom Fim. 



60. Argia gerhardi, sp. nov., £>> Chulumani, Bolivia. 



61. Argia mollis Hagen, 9> Chapada. 



62. Argia tinctipennis Selys, 9> Peixe-Boi, Brazil. 



63. Argia botacudo, sp. nov., 9> Chapada. 



64. Argia smitkiana, sp. nov. ; 9> Chapada. 



65. Argia iralai, sp. nov., 9» Sapucay. 



66. Argia reclusa Selys, 9 > Chapada. 



67. Diargia bicellulata, sp. nov., 9> Chapada. 



Figs. 68-79. Left profile view of apex of abdomen of males of species of Di- 

 argia and Argia; 68^-79^, supero-internal oblique views of the right superior ap- 

 pendage of the same. 



68. 68j. Diargia bicellulata sp. nov., $ , Chapada. 



69. 695. Argia fosleri, sp. nov., g, Sapucay, November, 1 899. 



70. 70s. Argia gerhardi, sp. nov., £, Chulumani. 



71. "]ls. Argia kokama, sp. nov., $ , Iquitos. 



72. 72J. Argia hasemani, sp. nov., ,£ , Bom Fim, Nov. 20, 1 907. 

 73> 73 s - Argia tamoj/o, sp. nov., $ , Chapada. 



74, 74^- Argia smitkiana, sp. nov., <£ Chapada. 



75, Argia thisma, sp. nov., <£ , Chapada. 75^, dorsal view of superior ap- 

 pendages of the same. 



76, 76^. Argia chapada, sp. nov., $ , Chapada. 

 77» 77 J - Argia botacudo, sp. nov., $ , Chapada. 



78, ySs. Argia tnpi, sp. nov., $ , Chapada. 



79, 79*. Argia subapicalis, sp. nov., $ , Chapada. 



