NO. 2192. DKAGONFLIES, CALIFORNIA AND NEVADA— KENNEDY. 493 



Segments 7-10 black, with the narrow brown stripe along the ven- 

 tral edge of the side, as in segments 3-6. Intersegmental membranes 

 brown. A large subrectangular pure blue spot covering all the dorsum 

 of S and extending caudad over the anterior third of 9 and cephalad 

 over the posterior sixth of 7. Ventrum of segments 1, 9, and 10 

 brown, of segments 2-8 black. Appendages black with the bases of 

 the inferiors brown. 



Female, color of dried material. — Labrum brownish, edged above 

 with black. Nasus gray. Genae and vertical surface of frons bluish 

 gray. Postclypeus, horizontal surface of frons and vertex black. 

 Postocular spots large, triangular, connected. Postoccipital areas 

 black on internal and dorsal edges, pale cream on inferior, exterior 

 edge. (See fig. 20.) 



Prothorax black on dorsal surface with anterior lobe pale and pos- 

 terior lobe edged with pale cream, sides creamy olive. 



Mesothorax and metathorax colored as in the male, but the ante- 

 humeral pale stripe continuous, showmg only a constriction where in 

 the male is the break. The pale colors are less bright in the female, the 

 antehumeral stripe being olive brown, with a narrow stripe of the 

 same, posterior to the black humeral stripe, this shading into a pale 

 bluish gray on the metepisternum. The pale areas of the posterior 

 and inferior surfaces are creamy as are the pale areas of the legs. 

 Wings hyaline with bro^vn stigmas. 



Abdomen colored as in the male, except that the dorsum of seg- 

 ment 9 is entirely black. 



Nymph. — Length, exclusive of gills, 14 mm.; gills, 7.5; hind femur, 

 4; head, 3.5 wide. (See figs. 43-49.) 



Color usually muddy brown with black markings. 



Head wide, its length being five-ninths of its width. Occiput 

 deeply concave. Postocular areas covered with numerous minute 

 spicules. Dorsal surface very flat. Antennae seven jointed, the 

 sixth and seventh closely united and appearing as one; segments 1 

 and 6 black, and the proximal half of segments 2 and 3 black. Eyes 

 with a checker pattern. 



Labium with three large mental setae on each side and occasionally 

 a smaller one at the base of one or both rows. Five lateral or rap- 

 torial setae. Each lateral lobe with a large movable hook and several 

 end teeth as follows : A large internal tooth set off from three smaller 

 teeth, which are followed by three or four minute teeth on the outer 

 side of the end (see fig. 47). Labium when closed reaching to the 

 second coxae. 



Prothorax with posterior lobe wide, each side of which is curved 

 cephalad on the side of the prothorax, where it ends in a low prom- 

 inence.laterad of the middle lobe. Sides below the forward curve of 

 the posterior lobe black. 



