NO. 2192. DRAOONFLIES, CALIFORNIA AND NEVADA— KENNEDY. 503 



Male, color. — Labrum pale, nasus pale, edged above with black, 

 postclypeus black. Genae, bases of mandibles and anterior surface 

 of frons greenish blue. Vertex black. Postocular spots small, pure 

 blue, not connected, and not confluent with the blue of the rear of the 

 head. Eyes greenish below, abruptly black above. Rear of head blue, 

 with a large, central, black spot. (See fig. 56.) 



Prothorax shining greenish black, except anterior lobe, pale, and 

 lower half of side, pale blue. Coxa blue. 



Mesothorax and metathorax greenish blue, with the anterior surface 

 black, this extending caudad along the sides to halfway between the 

 hmneral and first lateral sutures. Mesinfraepisternum blue, its upper 

 third black. Second lateral suture narrowly black, this widening 

 above mto a narrow elliptical spot. Coxae blue with a black spot. 

 Legs: Trochanters and femora black with a broad blue stripe on the 

 interior side; tibiae greenish with an external black stripe; feet pale. 

 Stigmas of front wings black with white apices; huid wmgs brown 

 with white apices. 



Abdomen shining black, except as follows: Side of segments 1, 2, 

 the anterior two-thirds of side of 3, sides of 8-10, blue. Also apex of 

 2 blue; a trifoliate pure blue spot on apex of dorsum of 8, as well as 

 the dorsum of 9 blue. Sides of segments 4-7 yellow. Segments 

 3-7 with a narrow, pale, basal ring, interrupted middorsally. Inter- 

 segmental membranes of segments 8-10 pale. 



Female, usual adult color. — Labrum greenish, edged above with 

 black; nasus, base of mandibles, genae and anterior surface of frons 

 bluish green; postclypeus and vertex black. Postocular spots 

 moderate, blue, and confluent with the greenish blue of the rear of the 

 head. Eyes greenish below, with a black cap, sharply demarked by 

 a horizontal line. (See figs. 57-58.) 



Prothorax bluish green on the sides, its dorsum black, except the 

 anterior lobe and the two horns, usually pale. 



Mesothorax and metathorax blue, except for the following black 

 markings^ A broad middorsal stripe occupying half of the mesepis- 

 ternum on either side, a narrow humeral stripe and narrow stripes 

 on the upper fourth of the fu'st and second lateral sutures. Legs 

 greenish with the femur broadly black above and the tibia with an 

 external black stripe; feet pale. Pterostigmas brown. 



Abdomen with enthe dorsum black, except a narrow basal pale 

 ring, mterrupted middorsally on segments 3-7, and the intersegmental 

 membranes of segments 1-2 and 7-10, which are blue. Sides of seg- 

 ments 1, 2, and 8-10 blue, of 3-7 yellow. 



The female of this species from the teneral to the senile color passes 

 through several remarkable color stages, and is dimorphic and possi- 

 bly trimorphic in color. The large series of females collected at Cal- 

 istoga, Cahfornia, June, 1914, were studied as to theu- color patterns 



