NO. 2192. DRAGONFLIEti, CALIFORNIA AND XEVADA— KENNEDY. 563 



Apex of hind femui reacliing to or beyond auricle, in the male, with 

 only short spmes, but in the female with about 15 long spines m the 

 outer two-thirds of each row and 8-10 short spines in the imier third 

 of each row. Long hairs in basal tliird of femur in both sexes. An- 

 terior hamuh half as long as posterior, slightly dilated upward, then 

 abruptly contracted to a hook which termmates the anterior edge, 

 the tip of the hook pointing caudad. Posterior hamules leaf shaped, 

 the posterior edge thickened, the anterior edge with a subapical 

 point du-ected cephalad. (Fig. 281.) Semmal vesicle large, black, 

 its anterior surface terminating in two broadly conical projections. 

 Abdominal segments 8 and 9 moderately dilated, inferior edge of 9 two 

 and a hah times as long as 10. Superior ajjpendages, when viewed 

 from above, conical, in some specimens terminating in a poorly defined 

 needle point. Viewed from the side, the appendages are sHghtly 

 convex on the dorsal surface for the anterior two-thirds of their 

 length and slightly concave for the posterior third. A thin ridge or 

 lamma extends along the apical three-fourths to three-fifths on the 

 inner, lower side of each appendage. This appears in the lateral 

 view, but is largely hidden in the view from above. This ridge is as 

 wide as one-third the length of the appendage, being widest in its 

 anterior third, and tapermg regularly to the apex of the appendage. 

 Prongs of inferior appendage separated by length of inner edge of 

 either prong; prongs diverging, frequently half the inner edge of 

 either prong visible from above outside the superior appendages. 

 Viewed laterally, upper and lower fines of prong subparallel and the 

 prong terminatmg m a short tooth pointing dorsad. Viewed from 

 above, the outer fine convex in basal two-thirds and straight or sfigfitly 

 concave in distal third; tip rounded. (Figs. 282-285, 294-298.) 



Vulvar lamina of female broadly V-cleft, the lobes as long as wide, 

 with blunt pomts. Female appendages as long as 10. (See fig. 286.) 



In both male and female the under surface of the occiput is not 

 visible from above; that is, the posterior edge does not turn up as in 

 Stylurus. This edge in the two females is straight; in the majority 

 of the males a sHghtly convex curve, fightly indented in the center. 

 (Fig. 287.) 



Coloration, male. — Labium black with yellow lateral edges; enthe 

 face and frons greenish yellow except posterior edge of horizontal 

 surface of frons, which is black, as is the entire vertex; occiput yellow. 

 Eyes gray with three yeUow spots behind each. (See fig. 288.) 



Prothorax entirely black, except obscure median dorsal spot, and 

 in some specimens minute upper and lower lateral spots. 



Meso thorax and metathorax dull grayish olive green, marked 

 with black as follows: Middorsal stripe 1.75 mm. wide, extending 

 from the black antealar sinus to the pale posterior edge of the black 

 mesostigmal lamina; humeral and antehumeral strij^es entirely fused 

 into a stripe 2.5 mm. wide; a broad band connecting inferior end of 



