49^ CALIFORNIA ACADEMY OF SCIENCES. 



of thorax, except a short superior black Hne on the first 

 lateral suture and a complete black line on the second; 

 feet, except an anterior black stripe ; 8 and 9, except a 

 short lateral band each side not reaching the apex of the 

 segments. A transverse, interrupted, basal, yellow ring 

 on 4-7. 



Forked elevation on 10 half as high as 10 itself; viewed 

 in profile it commences at the base and rises at an angle 

 of about 50° ; forked in at least its apical half, branches 

 divergent at an angle of less than 90", extreme tips turned 

 outwards. Superior appendages extremely small, about 

 one-third as long as 10, tubercular, with a long, slender, 

 acutely pointed, inferior process. Inferior appendages 

 nearl}^ as long as 10, directed upwards, apical half black, 

 flattened, apex emarginated in a shallow curve forming 

 two tips, outer tip barely longer but projecting farther 

 backwards and outwards. 



Wings clear. Pterostigma neai^ly equilateral, all four 

 sides slightly convex, black on front wings with a pale 

 line along the edges; dark gray on the hind wings with 

 a similar pale line, and only slightly smaller in size; in 

 teneral 5 pale yellow on all the wings. Front wings with 

 8-11 postcubitals. Nodal sector arising near the fouth 

 postcubital, or a little more remote, on the front wings, 

 near the third on the hind wings. 



? Similarl}^ colored. Pterostigma of all the wings yel- 

 low, 12-13 postcubitals on front wings. 



Abdomen 5 20-23, ^ -4- Hind wing 6 13-16,? 17. 



Distribution. Mexico (Baja California as above), Cal- 

 ifornia, New Mexico (Santa Fe, August, T. D. A. Cock- 

 erell). 



