ODONATA OF BAJA CALIFORNIA. 487 



mid-dorsal carina usually blue ; the black humeral stripe 

 is almost as wide as the blue antehumeral stripe except 

 at its upper end where it is narrower and connected by a 

 black line with the mid-dorsal stripe just in front of the 

 antealar sinus; antealar sinus, except at its anterior 

 margin which is blue ; a short stripe at the upper end of 

 the second lateral suture and on the rest of that suture a 

 very fine line ; femora superiorly and an anterior tibial 

 stripe; a dorsal spot on the basal half of i ; on 2 varying 

 from a rather narrow mid-dorsal band reaching from base 

 to apex, narrowest at the middle of the segment, with an 

 angular dilation before the apex — to a round apical spot 

 connected by an apical tail with the apex of the segment; 

 3 with a lanceolate mid-dorsal spot, pointed posteriorly, 

 on the basal half, and a broader spot or band on the apical 

 fourth; 4-6 similar to 3, sometimes the basal and apical 

 spots of 6 united by a narrow line ; 7 almost entirely, 

 except a narrow, transverse, medially-interrupted, basal, 

 blue ring, which also exists on 3-6; 8-10 blue, 8 with a 

 minute, mid-dorsal, basal point, 10 with a narrow median 

 stripe, black. 



10 slightly excised at middle of hind, dorsal margin, 

 a small black tubercle at each side of excision. Superior 

 appendages longer than 10, viewed from above divergent 

 except at apex, lamellate, obscure and pale in color except 

 along the apical and superior margins which are black. 

 Viewed in profile each appendage becomes slightly wider 

 to the apex which is truncated almost at right angles with 

 the superior margin; on the inferior margin in the basal 

 half of the appendage is a well-developed, lamellate tooth, 

 directed downwards; the margins of this tooth are con- 

 vergent, the apical margin being the more oblique to the 

 appendage so that the apex of the tooth is bluntly pointed. 

 Inferior appendages pale, slender and conical in their 



