NO. 2192. DRAG0NFLIE8, CALIFORNIA AND NEVADA— KENNEDY. 525 



species were common in the American River at Sacramento, Kings 

 River at Readlcy, the San Joaquin at Friant, and Kern River at 

 Bakersfield, which are all wide, shallow streams with beds of drifting 

 sand. 



Apparently this species has a long season on the wing as Grinnell's 

 records are from May to August. On the Chico River the few 

 individuals I saw were flying about a quiet pool at the head of a long 

 rapids and when not in motion were seated on snags in the water 

 or on the gravelly shore. Their habits seemed much like those of 

 Opliiogomphus hison with which they were associated, except that 

 they were much more wary and difficult to capture. Their large size, 

 slender abdomen and peculiar brown thorax readily distinguish them 

 in the field from any other western gomphine. 



Both the imago and nymph of this slender, graceful species differ 

 widely in stmcture from any other western gomphine. The anterior 

 hamules in the male are covered by wide laminae on the posterior 

 hamules and the seminal vesicle is invaginated on its anterior face, 

 which makes a deep hollow in which the two long filaments of the 

 penis are coiled when in repose. The inferior appendage of the 

 tenth segment is divided to its base, making a pair of inferior append- 

 ages. (See figs. 150-154.) 



In life Progomphus horealis is noticeable for the reddish brown of 

 the front of the thorax and the yellow abdomen with the large black 

 triangles on segments 3-8. In detail the color is as foUows: 



Male. — Entire face gray but horizontal surface of frons pale 

 brownish;, vertex dark brown, lighter posterior to the ocelli; occiput 

 gray with brownish tinges; eyes gray. (I find that I have omitted 

 the live eye color in my field notes.) Upper third of postoccipital 

 region dark brown, lower two-thirds creamy with a horizontal brown 

 stripe. (See fig. 148, A.) 



Thorax with anterior surface pale brown and sides pearly gray. 

 The following markings occur: An obscure reddish brown stripe on 

 each side of the middorsal carina, these stripes wedge shaped, with 

 the wide end below; a wide reddish brown humeral stripe, and 

 anterior to tliis, separated by a pale line, a second wide stripe, the 

 upper end of wliich usually connects with the upper end of the wedge 

 stripe next the middorsal carina; a brown spot on the metathoracic 

 spiracle and the second lateral suture brown; legs with coxae pale, 

 femora pale with black apices and a black stripe on the upper and 

 posterior surface of each; tibiae and tarsi black; wings hyaline 

 except a reddish brown fleck at base which, in the costal and sub- 

 costal spaces, does not reach beyond the basal subcostal crossvein. 

 There is no color in the origm of the sectors of the arculus, as occurs 

 in the eastern species, Progomphus obscurus; costa yellow, ptero- 

 stigma jet black. 



