550 PROCEEDIXOS OF THE NATIONAL MUSEUM. vol. 5i', 



California. Olivaceus is recorded from the San Joaquin River east to 

 the Humboldt and Owens E-ivers and north to the British Columbia 

 portion of the Columbia River. I have not examined the British 

 Columbia specimens, but the Humboldt River form is paler in color 

 than the Owens River and Central California form. The species 

 thus breaks into at least two varieties. The situation with confrater- 

 nus is even more comphcated. I have not seen the California form 

 called confraternus by Selys. From my study of Coast Oomplius I 

 believe that sohrinus, donneri (see pp. 562-570), and the form from 

 Seattle, Washington, called confraternus by Osborn ^ will bo found to 

 intergrade with this California confraternus of Selys, which has not 

 yet been rediscovered. The name which will have to be used for this 

 group of varieties will have to be confraternus because of priority. 



In the following pages I have considered donneri and sohrinus as 

 distinct species because I do not have material that absolutely 

 connects them. 



Olivaceus and intricatus are species of warm, muddy and sluggish 

 rivers. The ''confraternus group" have more diversified environ- 

 ments. Sohrinus of this group is found in the small sluggish streams 

 of Central Cahfornia. Donneri is from the cool clear mountain lake 

 whose name it bears, while the form from Seattle, Washington, called 

 confraternus by Osborn (see p. 565) was taken on Lake Washington, 

 a lake of clear water that never freezes. 



The forms of the confraternus group do not fall into any of the 

 subgenera estabhshed by Dr. J. G. Needham on nymphal characters. 

 See pages 570-571 for descriptions of nymphs. 



GOMPHUS INTRICATUS Hagen. 



I first found this small yellow GompJius on the Humboldt River at 

 Golconda, Nevada, on August 7. Late in the afternoon after a day 

 of ordinary collecting around the hot springs and thi'ough the willow 

 thickets of the river bottoms, I caught a male and four female Gom- 

 phus on the bank of the river. Seeing that they were strange to me 

 but not noticing them closely I took them for a single species. In 

 the evening I went by train to Winnemucca and that night, when 

 papering my day's catch, I decided that the male and two of the 

 females were one species, while the other two females were of another 

 species, of which I had no males. The following day I collected along ' 

 the Humboldt at Winnemucca and caught a good series of the larger 

 species of w^hich I had a male from Golconda, but did not see a single 

 specimen of the smaller species of which I had but two females. 



Not knowing where I might again take the small species, except at 

 Golconda, I boarded the afternoon train and went back, spending 

 the next day collecting again around Golconda. I made a painstak- 

 ing search among the willows for Gomphus and took several of the 



1 Ent. News, vol. 16, 1905, p. 189. 



