536 CALIFORNIA ACADEMY OF SCIENCES. 



Macrothemis. The differences between it and iiiittans 

 are to be found in the tarsal nails, the appendages of the 

 males, the color of the wings of the females, etc. 



33. Trithemis basifusca n. sp. PI. xvi, figs. 58-61. 



2 ^ El Parfiiso, not dated. 



10 2? Sau Jose del Cabo. not dated. 



1 1 Sau Jose del Cabo, September, 1893, G. Eisen. 



57 22 San Jose del Cabo, October, 1893, G. Eisen. 



4 4 Mesa Verde, October, 1893, G. Eisen. 



3 Sierra El Taste, west side, September, 1893, G. Eisen. 

 21 8 Miraflores, September, 1894, Eisen & Vaslit. 



3 1 San Jose del Cabo, September, 1894, Eisen & Vaslit. 



lOU 38 5 



$, Blackish: frons and vertex dark metallic blue. Oc- 

 ciput extending forward between the eyes, so that the 

 latter are in contact for a distance equal to one -half of 

 the length of the dorsal surface of the occiput. Superior 

 appendages as long as 9, brown, darker at the tips, nearly 

 straight, with an inferior row of about twelve denticles, 

 apex acute. Inferior appendage about one-sixth shorter, 

 reaching be3^ond the denticles of the superiors, viewed 

 from below quite broad at base, subtriangular, apex ter- 

 minating in two denticles. Anterior lamina less promi- 

 nent than adjacent parts, margin entire. Hamule with 

 apical half bifid, branches of nearly equal length, inner 

 branch conical, curved, apex acute; outer branch lamel- 

 late, twice wider, apex obtuse. Genital lobe more prom- 

 inent, longer than wide, narrower at apex than at base, 

 apex roundly pointed. Wings clear, front wings slightly 

 brownish at extreme base for not as much as the length 

 of a cell, hind wings with a dark brown spot extending 

 from just behind the costa backwards to about the level 

 of the apex of the membranule, and from the base of the 

 wing outwards to a short distance beyond the first ante 



