338 PROVEEDINGii OF THE NATIONAL MUSEUM. vol.4<j. 



UMATILLA, OKEGON. 



On my return from the Deschutes I collected at Umatilla, Oregon, 

 on July 8 and 9. Umatilla is a raih'oad yard among the sandhills 

 at the mouth of the Umatilla River. A gale was blowing during 

 this time but I found the following species: Enallagma carunculatum 

 Morse, OpMogompTius occidentis Hagen, Ophiogomplius severus Hagen, 

 Aeshna multicolor Hagen, Lihellula forensis Hagen, and Sympetrum 

 semicinctum (Say). 



All the species were stragglers except OpliiogompTius occidentis. 

 This species was emerging in numbers on the point of land separating 

 the down-stream side of the Umatilla River from the Columbia. 

 From the place of their emergence it appeared that the nymphs 

 hved in the bay or open mouth of the Umatilla River, where they 

 were on a mud bottom and not exposed to the main current of 

 either river. Though the banks of both rivers were searched for some 

 distance none were found emerging elsewhere. Because of the high 

 wind they were easUy captured while hanging to the sage bushes 

 among which they had taken refuge. Numerous exuviae were 

 found on the beach and on plants and brush lying in the water. 

 Figures 195-197 show details of the exuviae which have not hitherto 

 been figured. 



YAKIMA VALLEY, WASHINGTON. 



Collecting in the Yakima Valley, Washington,^ was done altogether 

 in that part lying between Grandview and North Yakima. This 

 part of the valley lies entirely in the sage brush and, excepting those 

 parts now irrigated, has no mesophytic vegetation except the narrow 

 fringe of trees along the Yakima River and its tributaries, and the 

 swampy areas about the alkahne ponds in the Yakima River bottoms. 



I have described Satus Creek in the section on Argia vivida and 

 Argia emma (pp. 269-270) . The Yakima River itself contains but little 

 odonate life. It is a shallow stream during the irrigating season, 

 when most of its water is withdrawn, and is easily forded every 

 mile or so. In the more swift reaches it is gravel bottomed and in 

 the bends mud bottomed. The alkaline ponds fall into two groups, 

 the larger ones between Smmyside and the Yakima River, the 

 largest of which is Nigger Pond, a half mile long and an eighth mile 

 wide, and the group of smaller fresh ponds near Donald. 



1. AGRION AEQUABILE YAKIMA (Hagen) (figs. 160-167). 



I saw one specimen of this near Outlook. Otherwise I took it 

 only on lower Satus Creek, where it was abundant. Here it was 

 first seen June 17. It reached its greatest numbers July 27. On 

 August 7 few were seen, and none on August 17. 



> I have just found a male and female Tachopleryx hageni in (he collections in the California Academy 

 of Sciences. These are from Monroe, Washington, and will be described in my paper on collecting done 

 in California and Nevada during 1914. Nevada is the type locality of this species. 



