NO. 2192. DRAGONFLIES, CALIFORNIA AND NEVADA— KENNEDY. 539 



Abdomen with segments 1 and 2 olivaceous; segments 3-10 yel- 

 low on dorsal surface, and segments 7-10 yellow on the sides also. 

 Probably the sides of segments 3-8 are white in life. The markings 

 on the abdomen are as follows: Segment 1 with a large brown spot 

 above on either side; segments 2-10 with the usual ophiogomphine 

 saw-toothed band on either side, but the teeth of the two bands are 

 broadly connected across the posterior end of segments 3-7 and 

 connected, but more narrowly, across the ends of segments 2 and 7-9. 

 In two of the males there is a small pale brown spot on the upper 

 side of segment 10; in the third the lateral band is continuous to 

 the bases of the dorsal appendages, but on segment 10 is a paJer brown. 

 Appendages yellow. 



Female. — Color similar to that of the male but the posterior half of 

 vertex pale; tips of occipital horns black. Abdominal black pattern 

 similar to that of the male, but the teeth of the lateral bands broadly 

 connected across the apical end of segments 8 and 9 as well as on seg- 

 ments 3-7. Appendages yellow. 



Abdomen, male, 40 mm.; female, 42; hind wing, male, 34 mm.; 

 female, 37. 



This species was called to my attention by Mr. E. B. Williamson 

 who had obtamed two males and two females in trade from the Snow 

 collection at the Kansas State University of Lawrence, Kansas. Later 

 I obtained through Mr. Hunter three males and a female from the 

 same collection. All of these specimens were wrongly labeled Ophio- 

 gompJius severus. The three males in my collection are labelled "S. 

 Arizona, F. H. Snow, Aug., 1902." The female is labelled "Oak 

 Creek Canon, Ariz., 6,000 ft., Aug., F. H. Snow," I have associated 

 the female with the two males because it was so associated in the 

 Snow collection, and because of identity of size and color pattern and 

 the occiput, which seems adapted to the male's inferior appendage. 



Structurally this species is distinguished as follows: Size large, 

 male superior appendages 2 mm. in length, subcylindrical, slightly 

 curved ventrad and mesad so that they are convex on the external 

 profile and concave on the inner; the apical end suddenly contracted 

 to a well developed point. The inferior profile from the base of the 

 appendages to the base of the terminal point is an ahnost straight 

 line, though slightly smuous in one specimen. The distal two-thirds 

 of the lower surface bears between thirty and forty short conical, 

 black spines. Except m the greater number of spines the superior 

 appendages do not differ from those of severus. The inferior append- 

 age is one of the distinguishing characters of the species. It is pecu- 

 liar in being only half the length of the superiors. Viewed from above 

 it is bifurcate to the basal third, the two branches meeting apicaUy 

 around an oval opening. Viewed laterally the ventral profile is a 

 semicircle, while the dorsal profile is a nearl;y straight line slightly 



