DRAGONFLIES, CALIFORNIA AND NEVADA— KENNEDY. 487 



nected with the black of the dorsum. Segments 3-9 with sternum 

 black; creamy on 1, 2, and 10. Superior appendages black; inferior 

 pale. Segments 9 and 10 heavily prumose. 



Female, color. — Colored hke the male but with a dumbell-shaped 

 black spot in the lower apical angle of segments 3-8, which is not 

 connected with the doi-sal black. Segment 9 with a large black 

 blotch on its lower anterior angle. Genital valves broadly black on 

 their lower edge. (See fig. 4.) 



The teneral colors of stultus are similar to those of the tenei'al unca- 

 tus; a general color of salmon pink with pale bronzy markings. 



The color pattern is quite variable but differs from that of uncatus, its 

 nearest relative, in being always black, where in uncatus it is always 

 metalUc green; in the well developed blue antehumeral stripe, where 

 m uncatus there is seldom even the shghtest indication of one, and in 

 the less amount of black on the legs; m uncatus the legs are black ex- 

 cept an internal stripe on the femur and a mere hair line of pale on 

 its exterior surface, and a very short, narrow, exterior pale hne on 

 the proximal end of the tibia. 



Structurally stultus differs from uncatus in its greater size, as is 

 shown in the following comparative measurements: 



The individual stultus the abdomen of which measures 30 mm. in 

 the table is unusually small. The average is around 33 or 34. 

 The male appendages are very similar, as is shown in figures 11-13 

 (uncatus) and 8-10 (stultus). In stultus the inferior appendages have 

 a slightly more acuminate point than in uncatus. 



The description of the nymph of this species which follows is 

 based on exuviae collected on ''Mud Lakes" west of Stanford Uni- 

 versity during May, 1915. As these were collected when stultus was 

 abundant and no disjunctus were caught I did not doubt their authen- 

 ticity mitil I returned in July and found but few stultus flying and 

 disjunctus abundant. Probably they are stultus. 



Nijmfh. — A long slender nymph (figs. 14-18) much larger than its 

 nearest relative, uncatus. 



Labium (figs. 15-17) long and slender, reaching back to middle of 

 hind coxae or even to their hind margin. The proximal part of the 

 mentum is about two-thirds of its length, and its breadth is less than 

 one-eighth of the width of the mentum at the bases of the lateral 

 lobes. It expands proximad to three times its middle breadth. 

 Mental setae 7. Lateral setae 3, two on the movable hook and one 

 on base of lateral lobe. Lateral lobe of same general shape as that 



