ODONATA OF BAJA CALIFORNIA. 505 



anterior notch, yellow; occiput yellow, hind margin 

 straight; rear of eyes black. 



Thorax pale brown or luteous (?), sides with two ob- 

 lique pale bluish stripes margined with black inferiorly, 

 humeral and second lateral sutures marked with black 

 lines. Legs blackish, reddish-brown at bases. 



Abdomen moderately swollen at the base, constricted 

 at 3, of nearly uniform width from 4-10, brown, marked 

 with blue or green as follows : apical half of 2 ; an apical 

 spot each side of 3-10, not confluent; base of 3-7 with a 

 transverse band, represente4 by a small basal spot each 

 side of 8; a transverse median band on 3-7, interrupted 

 by the mid-dorsal carina; a lateral spot behind the me- 

 dian transverse suture on 3-8, and which may become 

 confluent with some of the other spots. Sternum of i 

 with the denticles (frequently to be found on this place 

 in various species of ^schna) situated on the summit of 

 a small tubercle. Auricles of 2 with two teeth. Seg- 

 ment 10 with a basal mid-dorsal keel-like tooth and two 

 parallel, lesser ones each side. 



Superior appendages as long asp-j-io, curved some- 

 what inwards and widened more or less gradually on the 

 inner side in the apical half, concave below, above with 

 a median, longitudinal carina which becomes quite sharp 

 and more elevated in the apical fourth, but is not denti- 

 culated; margins entire, apex truncated to form an angle 

 of a little more than 90^. Viewed in profile, the basal 

 fourth is directed downwards and a very slight inferior 

 projection marks a change of direction to the horizontal, 

 while the apical fourth slopes slightly upwards. Inferior 

 appendage a little less than half as long, triangular, apex 

 rounded, very shghtly notched. 



? Differs from the 6 as follows : a small, narrow, iso- 

 lated antehumeral, yellow spot on thoracic dorsum, stripes 



