Zool.— Vol. I.] CALVERT— ODONATA. 379 



Appendages blackish. Superiors a little more than half as long as 10; 

 viewed from above, divergent, each with outer and inner sides nearly par- 

 allel, apex bifid, branches subequal and parallel; viewed in profile, directed 

 slightly downwards, with an inferior basal tubercle. Inferiors longer than 

 the superiors, about as long as 10; viewed in profile they are directed 

 upwards, upper margin nearly straight, lower somewhat concave, apex trun- 

 cated nearly at right angles to the long axis of the body, but from the middle 

 of the truncated margin projects a triangular process directed backwards and 

 somewhat upwards. 



Wings clear. Pterostigma dark brown, surmounting one cell, outer end 

 more oblique than the inner. Front wings with five antenodal cells, sixteen 

 to seventeen postcubitals, nodal sector arising near the seventh or eighth, 

 intranodal at two to four and one-half cells more remote, upper side of quad- 

 rilateral one-third as long as the lower side. Hind wings with four (five in 

 one wing of one male) antenodal cells, thirteen to fourteen postcubitals, nodal 

 sector arising near the sixth or seventh, ultra-nodal at three to five cells more 

 remote, upper side of the quadrilateral one-half as long as the lower side. 



Female (apparently of the same species) differs from the male in having the 

 violet replaced by light blue throughout; occiput and most of the rear of the 

 head pale, the latter with an irregular black spot on each side; lateral longi- 

 tudinal stripes on 2-6 reaching almost the entire length of the segments; 

 8 and 9 with a second longitudinal stripe on each side, nearer the mid-dorsal 

 line, united at the base on 8; the transverse apical ring and the lateral stripe 

 on 10 lacking; 10 with a triangular, mid-dorsal, apical excision, with a pale 

 bifid tubercle below; appendages pale, shorter than 10. Valvules pale, api- 

 cal half of their ventral margins finely denticulated. Pterostigma ochreous, 

 on the hind wings surmounting two cells. 



Dimensions: Total length, S 41-43 mm., 9 40 mm.; abdomen, S 32-34 

 mm., 9 31mm.; hind wing, & 23.5-25 mm., 9 26 mm. 



i o i ? Tepic, Oct., 1894, Eisen and Vaslit. 

 40 " Nov., 1894, " 



S3 1? 



The specific name is in honor of Dr. H. W. Harkness, 

 past President of the California Academy of Sciences, to 

 whom much of the success attending the expeditions to 

 Baja California and to Tepic is due. Its nearest ally is 

 probably A. insifida Hagen, the type of which I have 

 studied in the Museum of Comparative Zoology, Cambridge, 

 Mass., and from which it differs structurally and in the 

 coloring. 



