NO. 2192. DRAGONFLIES, CALIFORNIA AND NEVADA— KENNEDY. 549 



except n'evadensis, which they resemble, but not differing enough to 

 make a positive specific character. Lateral hooks on segments 7-!). 

 The paired superior appendages four-fifths as long as the median 

 appendage. (See figs. 219, 227-229, 241 and 246.) 



Length, 28 mm. ; abdomen, 18 ; hind femur, 5 ; width of abdomen, 8. 



Described from numerous emerging nymphs and exuviae collected 

 on Donner Lake, July 23, 1914. 



OPHIOGOMPHUS MORRISONI NEVADENSIS Kennedy, nymph. 



A large fight colored nymph, naked except for a few short hairs on 

 the tibiae and about the head; 26 labial teeth. Abdomen with dorsal 

 hooks on segments 2-9, longer, more slender, and more erect than in 

 other species except mormom. Lateral hooks on segments 7-9. The 

 paired superior appendages four-fifths as long as the median ap- 

 pendage. (See figs. 221, 233-235, 242 and 244.) 



Length, 31 mm.; abdomen, 20; hind femur, 5.5; width of abdo- 

 men, 8.5. 



Described from a single male exuvia collected on Winnemucca 

 Slough at Pyramid Lake, August, 1914. The only other gomphine 

 fomid at this place, which is a branch outlet of the Truckee River, 

 was Erpetogomphus compositus. This is not the nymph of that.* 



OPHIOGOMPHUS, species. 



In the Cornell collection are five dried nymphs from "N. Mex." 

 These are very close to severus, but differ in having the dorsal spines 

 noticeably weaker, and only the spine on segment 2 erect, those on 

 segments 3-9 pointing caudad. 



Severus is recorded by Selys ^ from the Merino Valley (elevation, 

 9,600 feet). New Mexico. I have seen no specimens of imagoes from 

 New Mexico. Selys records the Merino Valley as on the Colorado. 

 If so, this may be the nymph of arizonicus. 



12. THE WESTERN SPECIES OF GOMPHUS, INCLUDING A NEW SPE- 

 CIES AND A NEW VARIETY. 



I feel fairly certain that future collecting and study of intermoimtain 

 and Pacific coast species of the genus Gomphus will show that there 

 are only three good species.^ These are intricatus, olivaceus, and con- 

 fraternus. Intricatus apparently does not break into varieties. It 

 is recorded from the upper Rio Grande Basin northwest to the Hum- 

 boldt River in Nevada and west to the Owens River in southeastern 



1 In August, 1915, I collected several Ophiogomphus nymphs while seining for fish in Owens River, 

 Inyo County, California. As only Ophiogomphus morrisoni ncvadensis was taken in Owens River these 

 were probably that species. These were much more hairy than the exuvia described above but hardly as 

 hairy as morrisoni exuviae from Donner Lake. Finding these Owens River nymphs made me decide that 

 morrisoni and ncvadensis are forms of the same species. 



2 Bull. Acad. Belg. (2), vol. 46, 1878, p. 26. 



3 Since the above was written a single male of Oomphus graslinellus Walsh v/as found in the Carnegie 

 Museum of Pittsburgh, which had been caught on Lake Neumon, Washington. Dr. J. G.Needham 

 states that among his notes is a second record of graslinellus from Washington, which he had considered 

 an error. 



