NO. 2192. DRAG0NFLIE8, CALIFORNIA AND NEVADA— KENNEDY. 515 



Occiput yellow with a black band along its posterior edge. Posterior 

 surface of head black. (See fig. 115.) 



Prothorax black, its anterior and posterior lobes yellow. Proin- 

 fraepisternum pale. 



Mesothorax and metathorax oHve brown with dark bro\vn, ob- 

 scurely edged markings. Middorsal carina black. All alar ridges 

 black, A broad band on humeral suture, a similar broad band on 

 second lateral suture, and a third on the metasternal keel brown. 

 Infraepisterna yellow. All coxae and legs black. 



Abdomen with segment 1 pale. 



Segment 2 yellow, with four dorsal black spots and a spot on each 

 side posterior to the auricle. 



Segment 3 yellow, with the lower edge of the side black and two 

 tandem, lozenge-shaped, black spots on the middorsal line. 



Segments 4 and 5 similar to 3 but with the posterior of the two 

 doi-sal spots expanded into a quadrilateral spot covering the entire 

 dorsum posterior to the vertical carinae except a narrow band across 

 the apex of the segment. 



Segments 6 and 7 similar to 4 and 5 except in the greater extent of 

 the post-dorsal spot which connects at its apex on each side with the 

 black of the lower edge of the segment. 



Segment 8 black except for a row of three small yellow spots on 

 the upper part of each side. 



Segment 9 with an irregular anterodorsal spot. 



Segment 10 and appendages black. 



Female.— Colored as the male but the black sUghtly more exten- 

 sive (see fig. 116). 



The upper end of the mesinfraepisternum black. The anterior edge 

 and dorsum of segment 1 dark. The four dorsal spots on segment 2 

 and the lateral spot of the same segment larger. The postdorsal 

 spot in segments 3 to 7 covering the entire dorsum posterior to the 

 vertical carinae. Segment 9 as well as 10 entirely black. 



Measurements: Male abdomen (incl. appendages), 55 mm.; hind 

 wing, 50. Female abdomen, 57 mm.; hind wing, 50. 



Structurally this species is pecuUar in lacking the metathoracic 

 tubercle found in Tajiypteryx. In the male the superior appendage 

 has a minute tooth on the middle of its inferior edge. The inferior 

 appendage is without a median tenninal lobe and has a pair of supe- 

 rior basal hooks. In the female the stylus is placed subapicaUy on 

 the genital valve. (See figs. 117-120.) 



8. NOTES ON CORDULEGASTER DORSALIS AND C. DIADEMA. 



The nine species of Cordulegaster known from North America are 

 recorded from mountainous regions, though two are found also in 

 the hiUier areas of the northern Mississippi VaUey. Six of these 

 species occur in the Appalachians. Two are found in the mountains 



