ART. XIV -REPORT UPON THE INSECTS COLLECTED BY P. R. 

 UHLER DURING THE EXPLORATIONS OF 1875, INCLUDING 

 MONOGRAPHS OF THE FAMILIES CYDNID^ AND SALDiE, AND 

 THE HEMIPTERA COLLECTED BY A. S. PACKARD, JR., M. D. 



By p. E. Uhlee. 



[Plates 27, 28.] 



LETTER OF TRANSMITTAL. 



Baltimore, January 1, 1877. 



Dear Sir : The results of mj observations and collecting during the 

 two weeks that I was enabled, through your courtesy, to spend on the 

 plains and mountains of Eastern Colorado, are embodied, as far as pos- 

 sible, in the following pages. 



Although much hindered by rains, hail, and snow-storms, I was able 

 to extend rapidly a series of collecting trips from Denver, and a few miles 

 north of it as far as the Grand Caijon of the Arkansas River, a few miles 

 west of Oafion City, In all the sections visited, I had no occasion to 

 complain of the scarcity of insect life. Indeed, in such places as were 

 moderately supplied with water, either in the caiions of the mountains 

 or on the farms and lands adjacent to the creeks and irrigating canals, 

 many kinds of insects were as abundant as we find them to be in cor- 

 responding situations in the Atlantic States. It was only iu the per- 

 fectly desert spots which afforded no sustenance for vegetation that an 

 absence of these creatures was to be noted. An examination of the 

 country in and adjouing Denver, particularly on the west side, showed 

 that the common weeds of the eastern division of the continent had 

 already established themselves there, and that, as was to be expiected, 

 many of the common insects dependent upon them were present in 

 abundance. On the open commons of the suburbs of Denver I was de- 

 lighted to see large laatches of showy flowers, and to observe how cer- 

 tain insects of similar colors flew to and rested upon them. Very con- 

 spicuously was this the case with a delicately blue Lupin, with fine large 

 heads, which occurred in vast numbers near a mill-race running through 

 a low part of the plains. Two species of the little bluets, Lyccena 

 melissa and L. rapahoe, settled upon these flowers, and when at rest were 

 very difficult to recognize. Danais archijjpus Cramer was widely distrib- 

 uted, exceptin the high mountains, and was generally observed to be mat- 



