300 ENTOMOLOGICAL SOCIETY 



only winged creatures he saw flying down into the canyon. But 

 terflies and other insects, and birds other than swallows, would 

 turn back upon reaching the brink as if afraid to venture further. 

 As there is no water around the Bright Angel Hotel or anywhere 

 in its vicinity, and none below the brink till" one comes to the 

 spring just mentioned, it appears that the species captured at the 

 brink (Argia moesta, Herpetogomphus compositus and Sympe- 

 trum corruptuiri) must have come up from the spring, or, in 

 other words, ascended from the Lower Sonoran zone to the Tran 

 sition zone. It is noteworthy, however, that these are all species 

 which have a wide geographical distribution not confined to any 

 one zone ; no exclusively Lower Sonoran species was seen to 

 ascend to the brink of the canyon or was found above its normal 

 habitat. The elevation above sea level of the Bright Angel Hotel, 

 on the brink of the canyon, is about the same as that of Williams. 



At Winslow most of the species were obtained along an irriga 

 tion ditch full of clear, 'swiftly-running water, although a few 

 were taken over a very muddy, stagnant branch of the Little Col 

 orado river. Winslow's elevation is very much less than that of 

 Williams, probably about 5,400 feet. 



Las Vegas Hot Springs, New Mexico (altitude 6800 feet) was 

 the last locality visited. Here the first two weeks of August were 

 passed, collections being made along the Galliuas river, and here, 

 among other species, Hyponcura lugens and Argia vivida, 

 variety plana, occurred. 



The following list includes all the adults taken. The nymphs 

 were submitted for study to Dr. James G. Needham. I am in 

 debted to Dr. Philip P. Calvert for obligingly going over and veri 

 fying my determinations and helping me in many other ways. 

 The bibliographic references to the species are not given here but 

 may be found for the Zygoptera, in the Odonata part of the 

 Biologia Centrali-Americana, and for the Anisoptera, in Kirby's 

 " Synonymic Catalogue of Neuroptera Odonata or Dragonflies." 



Hetserina vulnerata Selys. 



Bright Angel, Colorado Canyon, 2700 feet, July 12 (6 JJ), 

 July 13 (4 adult and 4 teneral c?cT, 7 9 9). 



Hyponeura lugens (Hagen). 



Las Vegas Hot Springs, New Mexico, August 1 1 (i H^), August 



9(i ?) 



Argia moesta (Hagen). 



Bright Angel [Hotel], July n (i c?). July 10 (i 9) ; Bright 

 Angel, Colorado Canyon, 2,700 feet, July 12 (6 99), July 13 (3 

 99); Williams, June 30 ([ 9); Hot Springs, June 23 "(i 9), 

 June 24 ( i 9). 



