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 70 THE CONDOR VoL. XII FEMALES 13 adts 8 adts 2 adts 4 adts 18 adts 2 adts 6 adts Depth of Av. 9.5 9.8 10.1 9.5 10.5 10.3 10.1 bill at Max. 10.3 10.6 10.6 10.0 11.5 10.4 10.7 base. Min, 8.3 8.6 9.7 8.9 9.6 10.2 9.6 Width of .2kv. 7.8 8.1 7.8 7.7 8.4 8.4 8.3 bill at Max. 8.3 8.5 8.0 8.5 9.1 8.6 8.8 base. Min. 7.5 7.5 7.6 7.3 7.6 8.3 8.1 Width of Av. 4.0 3.8 3.4 4.0 4.6 3,9 4.1 bill atmid. Max. 4.3 4.2 3.6 4.3 5.0 4.2 4.3 of culmen Min. 3.6 3.4 3.3 3.8. 4.1 3.7 4.0 Of the thirty-six adults in spring and early summer plumage 'from southern California nine were molting more or less of the middle wing coverts. On the re- maining twenty-seven the black tipping to the middle wing coverts is as follows: heavily tipt, two; considerably, seven; slightly, eight; on one or two of the inner feathers only, eight; spotted only, one; partly black but not tipt, one; with abso- lutely no black, none. While some of the specimens from the San Francisco Bay region measure very close to some of those from the San Joaquin Valley, the former seem to have slightly heavier tipping to the middle wing coverts, and the bills of the specimens, from Marin County anyway, are more slender than those from the valley. For example the measurements of two specimens are as follows: Coil. of J. & J. W. M. no. 3300, San Geronilno, Marin Co., Cal., wing 125.9, tail 90.3, culmen 22.5, depth of bill 11.8, width of bill at base 9.4, width of bill at middle 4.2, no. 7009, Modesto, Stanislaus Co., Cal., wing 125.9, tail 87.4, culmen 22.1, depth of bill 11.4, width of bill at base, 9.2, width of bill at middle 4.2. These two specimens measure very close to each other, but the San Joaquin (Stanislaus Co.) specimen has a bill that Iook heavier, tho there is no way of showing this by measurements unless with very delicate instruments, and while the black tips are heavy in each they are more so in the Marin County bird. HABITS OF THE BLACK-CAPT VIREO (VIiYEO A7'iYICAPJLL US') By C. D. BUNKER WITH ONE PHOTO BY THE AUTHOR HE range of the Black-capt Vireo.includes south-western Kansas, Oklahoma, central and western Texas, and extends well into Mexico, keeping' to the gypsum canyons, or their vicinity, where the bird feeds on a little black beetle fo'und on the under side of leaves, and which, I believe, occurs only in such localities. In May, 1903, I collected thirty of these birds in Blaine County, Oklahoma, and preserved the stomachs of all of them. There seemed to be but one species of beetle in every stomach. I afterward sent the stomachs to an eastern entomologist, for the purpose of determining the food contents, and to learn if the beetle was peculiar to any certain locality, but unfortunately they were lost and the knowl- edge not obtained. Ridgway in his "Birds of North and Middle America" says: "Writers dif- fer as to whether the sexes agree in color, or not. The series examined, which