THE CANADIAN ENTOMOLOGIST. 231 



but they whirled away and passed out of sight. On another day he had 

 seen a newly-emerged female Bairdii, and was near it, but a low inter- 

 vening bush prevented him using the net. Just then down pounced a 

 male Oregonia. and the pair rose vertically in the air, circling about each 

 other — as butterflies do in courtship — and were soon lost to view. These 

 and other similar observations had made Mr. Bruce believe firmly in the 

 inter-copulation of the two species. 



The relation of the facts then known in the Can. Ent. excited some 

 litde interest and some surprise, together with more or less incredulity ; 

 and I determined to accompany Mr. Bruce on his 1894 trip to Glenwood 

 Springs, if he would let me, and go through the necessary experiments 

 with him. Though if I had been as well acquainted with Mr. Bruce as 

 in his company for six or seven weeks I became, I might have saved 

 myself the journey, for nothing can be more thorough than his method 

 of working. Nothing escapes him, and he makes no mistakes. But I am 

 glad that I had the pleasure of his personal acquaintance and company, 

 and I can commend Mr. Bruce as a companion and chaperon through 

 Colorado to any lepidopterist in search of pleasure and specimens for his 

 collection. 



We reached Glenwood Springs on twenty-ninth June, from Denver, 

 by the Rio Grande R. R , via Pueblo and the Royal Gorge Canon of the 

 Arkansas River, which river was followed many hours to Leadville — 

 elevation, 11,000 feet; then descended the Eagle River (a tributary of 

 the Grand) to the Springs. The Grand River is one of the two 

 principal streams which form the Colorado River, the other being Green 

 River ;— the junction in Utah. The whole region is semi-desert, and 

 nothing grows without irrigation except the native clothing of grasses 

 and scrub, and such pines and other trees as will stand the dry climate. 

 The sun shone clear nearly every day that I spent at the Springs ; very 

 hot after 8. a. m.; with occasional showers. But in August, which the 

 people call the " rainy season," there was rain pretty nearly every 

 afternoon ; and in all there were two or three days that might properly 

 be called rainy. The elevation of the hotel is 5,700 feet — high enough 

 to ensure cool nights all the summer ; and the mountains rise quite 

 abruptly from the river, sometimes precipitously, to the height of 2,500 

 or 3,000 feet more. Everywhere the bottoms are narrow, and the road 

 above the hotel has been cut out of the slope of the hill. Wherever 

 there is a space fit for cultivation, from half an acre to twenty or thirty, 



