1892.] NATURAL SCIENCES OF PHILADELVHIA. 117 



has a wouderful resemblance to the distant hollow, rolling 

 " whooooo " of Megascope. It is uttered by both sexes and whether 

 they be on the ground or on the wing, the quality of these notes 

 is so ventriloquial that I actually stumbled over three of the birds 

 without taking notice of them, in the search for a supposed owl 

 that I imagined 1 heard in a distant tree. On no occasion did they 

 make any other sound which would show their intimate relationship 

 to our C. virginianus. 

 *36. Micropus melanoleucus (Bairtl). White-throated Swift. 



A pair of these birds were certainly breeding in the cliffs where I 

 found Syrnium occidentale, though I could not, because of the nature 

 of the ground, make thorough enough search to discover the where- 

 abouts of their nest. 



I saw frequent companies of these birds in various places along 

 the Santa Clara Valley, skimming the waters of Silver Lake and 

 again sailing and twittering high in air, reminding one strongly, in 

 both situations, of the Chimney Swift. 



The day of my ascent of Mount Lemon, several of this species 

 were seen coursing about the summit in company with Violet-green 

 Swallows. 



37. Eugenes fulgens (Swains.). Rivoli Humming-bird. 



Soon after my arrival in the Catalina pine-belt I noted a large 

 hummer, feeding among the yellow columbines of a little canon 

 near the camp. I did not see it again until the day of my de- 

 parture from the mountains, when I found it in the same place and 

 upon shooting it found it to be an adult male of the above species. 

 This is probably the most northerly record for the Rivoli Humming- 

 bird and considering the time of its capture it seems quite likely 

 that it was breeding in the vicinity. 



38. Trochilus alexandri Boure. & Muls. Black-chinned Humming-bird. 



Very abundant in the Catalinas. One shot at Tucson and one 

 at Oracle. The love antics of this bird are highly entertaining. 

 Selecting an open space among the trees in the immediate vicinity 

 of its nest the male starts from his perch among the willows utter- 

 ing a shrill, continuous trilling note that bears a strange proportion 

 in its tone and quickness to the varying rapidity of flight. Having 

 reached the farthest limits of its chosen pleasure ground, at an 

 elevation corresponding to that of the nearest tree-tops, it suddenly 

 describes a headlong, parabolic curve, just grazing the ground and 



