Bombomelecta Arizonica, n. sp.– ♀. Length about 11 mm., black; head, thorax and legs with dull white hair, having a faint yellowish tinge; black hair on cheeks, lower sides of face, labrum and mandibles; hair of pleura, except its upper part, black; a conspicuous band of black hair between the wings; hair of anterior legs long and black, but the tarsimore or less silvery, and the femora with a conspicuous tuft of white hair near the end behind; middle tibiæ and tarsi largely silvery-white on theouter side, but the white and black pubescence are mixed, so as to produce a speckled effect; hind tibiæ and tarsi similar, except that the tibiæ have the outer apical half black ; tegulæ large, black, punctured; wings pale brownish, nervures piceous; abdomen heart-shaped, with sparse black hair, and conspicuous clear-cut patches of white hair; first segment with a broad band of yellowish-white erect or suberect hairs, interrupted in the middle; first to fifth segements with lateral patches of appressed snow-white hair, that on the second segment broad and deeply notched behind.