500 CALIFORNIA ACADEMY OF SCIENCES. 



anterior mesothoracic border. Sides of thorax, in fresh 

 alcoholic specimens, bluish, becoming brownish when 

 dried: second lateral suture with a brown stripe. Abdo- 

 men: the "dorsal spear-shaped" fascia not reaching 

 the apex of 3 ; 8 with a small, triangular, yellow spot 

 each side at base of dorsum, and on each lateral surface 

 a basal and a smaller apical spot; a small, yellow, apical 

 spot on each side of 9; a yellow streak on the middle of 

 the inferior lateral margin of 3-7. 



In none of the descriptions of the superior appendages 

 (which are about twice as long as 10) is mention made of 

 a longitudinal carina on the outer margin of the inferior 

 surface, extending from the base to not quite as far as 

 the middle of the appendage; this carina is finely dentic- 

 ulated, its course is convex exteriorly when viewed from 

 below. A similar carina is shown for P. coni-plicatns and 

 P. costa/is in PI. 11, Monog. Gomph. On the inner edge 

 of the branches of the inferior appendage are two to 

 four small, superior teeth immediately before the apex. 



Femora above reddish-brown, yellowish below, tibi« 

 blackish, knees yellow. The first tibia? have a pale in- 

 ferior carina, somewhat similar to that of the Corduline 

 males, which extends for almost their distal half. Similar 

 carinas are to be found in males of Progvmphiis integer, 

 P. gracilis, Gonip/ioides stigmata, Cyclophylla elongata, 

 and perhaps others of this legion. Rudiments of such 

 a carina are present on the first tibia? of Cordulegaster 

 males. 



Wings with basal brown spot extending one-third of 

 the distance to the first antecubital. 



$ As compared with the 5 , has the colors of the face 

 less obscure, somewhat paler; green on vertex in one 

 case reaching back to occiput; hind margin of occiput 

 slightly more convex ; a ver}' narrow, inferior, " humeral " 



