228 BULLETIN 31, TtNITED STATES NATIONAL MUSEUM. 



Two specimens from Connecticut, one from Georgia, and twenty-live 

 from California, AVashiugton Territory, Oregon, and Colorado. A sin- 

 gle specimen from Professor Riley's collection labeled "Hundreds found 

 under pine bark in damp situation," which agrees with observations 

 made by Perris (ETist. des Insects du Pin maritime, Ann. Soc. Ent. 

 France, 4, x, 326-330, i)l. 4, figs. 112-124) on European specimens. 



Xylota flavitibia. (Plate XI, fig. (!.) 



Xylota, sp. iiov., Williston, Proc. Am. Phil. Soc, xx, 1882, 327. 

 Xj/loia flavitibia Bi<5r)t, Aunales Soc. Ent. Fr., 1884, 546. 



Habitat. — Colorado ! 



S . Length, 12'"'". Face short, moderately recedingand concave, black, 

 rather thickly covered with white pollen. Antennal process rather 

 prominent. Antenn;e black, the third joint brownish or reddish black. 

 Frontal triangle wholly thickly white pollinose. Cheeks narrow, con- 

 vex below. Thorax metallic black, shining, a sericeous spot on the 

 inner side of each hnmerns, thickly clothed with short whitish pile. 

 Abdomen dark shining red, brownish or blackish towards the end ; first 

 segment, except the small hind angles, and hypopygium shining green- 

 ish-black; second segment wholly red. Legs black; all the tarsi, except 

 the last two joints, reddish yellow; tibiai reddish yellow, tbe front 

 and middle pairs with a broad brownish, the hind pair with a broad 

 blackish ring, beyond the middle. Hind femora considerably thickened, 

 but less so than in X. pigra; the hind coxae of male with a slender sharp 

 spur below. Wings nearly hyaline, but distinctly tinged with brownish 

 on the outer part; stigma brown. 



$ . The lower part of the front is pollinose, the second, third, and 

 fourth segments of the abdomen wholly red ; otherwise as in the male. 



Two $ and two 9 specimens. 



Xylota uotha, n. sp. 



Habitat. — Colorado! 



$ . Length, 11" ". Face and frontal triangle covered with gray pollen, 

 the ground color wholly black. Antennae, with the arista, black. Dorsum 

 of thorax shining metallic bronze green black, a sericeous spot on the 

 inner side of each humerus ; pile very short, light colored, on the pleurae 

 longer and white. Scutellum like the thoi acic dorsum. First segment 

 of abdomen .shining greenish black, fourth and hypopygium deep shin- 

 ing greenish black ; second and third segments light i;ed with a very 

 faint, slightly brownish median stripe; second segment with a narrow 

 black cross-band in front, dilated in the middle into a small triangle, 

 not reaching to the middle of the segment, opaque black ; the hind 

 border of the second segment narrowly and faintly brownish, the angles 

 behind blackish ; hind border of the third more distinctly biown, the 

 posterior angles more broadly brownish. Legs black ; base of all the 

 tibiiE, and tip of the front and middle pairs, and first three joints of the 

 front and middle tarsi, light yellow ; hind tarsi at the base, and the 



