234 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



opaqiie, clothed with very short bhick pile ; first segment wholly steel 

 blue, shiniu;^-, white pilose; second sejinieut with a steel-bine, very 

 broad, shining, sub-entire fascia, clothed with white i)ilej the two fol- 

 lowing segments near the anterior margin Mith a similar fascia, but in- 

 terrupted and less broad. Legs black, white ])ilose, femora at the 

 tip witli short black i)ile, the hind femora not incrassate; front tibiae 

 reddish brown ; middle and hind tibiae at ihe base, and the first two 

 joints of the front tarsi, brownish red. Wings cinereous, basal half, 

 hyaline, stigma blackish, veins black. 



$ . The abdomen somewhat narrower, the metallic bands of the second 

 and third segments somewhat luteous, the hind femora a little thick- 

 ened, the hind coxai unarmed. 



One female from Oregon, another from Washington Territory, and a 

 male from California. The color of the thoracic dorsum in these females 

 is a cobalt blue with a distinct coppery reflection ; in the male the cop- 

 pery luster is almost wholly wanting. The metallic blue cross-band of 

 the fourth segment of the abdomen in my si)ecimens does not a))i)ear 

 to be interrupted, but entire. The usual narrow pollinose band on the 

 front of the female and the sericeous spots on the inner side of the 

 humeri are present. 



Xylota elongata, n. sp. 



Hahitat. — New Hampshire, Pennsylvania!, Missouri"? 



?. Lengtii, 10 to 11'""^ Front, narrow above, shining black, polli- 

 nose across the middle. Face black, thickly whitish pollinose, narrowly 

 shining on the cheeks. Antennae black, third joint large, black, ellipti- 

 cal, arista wholly black. Dorsum of thorax shining, somewhat metallic 

 greenish black, obsoletely coppery striped ; humeri sericeous. Pleuia^ 

 shining black, white pilose. Abdomen elongate, narrow, shining bluish 

 metallic black; second segment with a spot in the middle in front and 

 the posterior i)art, and the third segment, except a large triangular spot 

 on in each side in front, sub()i)aque: fourth segment, except on the })os- 

 terior part, and the fifth wholly, shining black ; the pile on the metallic 

 portions is nearly white. Femora, except the immediate tip and the 

 last two joints of all the tarsi, black; four front tibiae, except a broad 

 preapical blackish ring and the three basal joints of the four front 

 tarsi, very light yellow ; hind tibiae at base light yellow, beyond black ; 

 three basal joints of hind tarsi brown, with yellow tips. Wings hyaline, 

 stigma, and the remainder of subcostal cell brown. 



Three specimens, White Mountains, August 1, Missouri (Theo. Per- 

 gande), and Pennsylvania (E. L. Keen). The color of the legs prevents 

 the identilication of this sjiecies with Bigot's X.meiaUifera. Xylota fari- 

 frons Walker (List, etc., ."jjI), n)ay possibly be this species, but the 

 anteniuc are not dark ferruginous. The length of the abdomen, as 

 Walker <lescribes it, ''abdomen linear, a little narrower than the chest, 

 and fully twice as long," applies better to this than to the allied species. 



