228 THE CANADIAN ENTOMOLOGIST. 



The third joint of the antennae in C. Willisto7ii is small, subquadrate, 

 and very much rounded at the tip; in the present it is very large, sub- 

 quadrate, and obtusely pointed at the tip. 

 C kilos ia cyanea, n. sp. 



Eyes bare, arista plumose, scutellum with bristles on the margin, 

 third antennal joint subquadrate, a little longer than broad, bright 

 reddish-yellow. Legs black. 



Female. — Shining blue. Front slightly sulcate medially, shining 

 black, distinctly punctate, black pilose. Face shining black, not pilose, 

 almost imperceptibly pollinose, deeply concave below the antennae (so 

 that in profile the concavity recedes to the eyes), tubercle rounded, 

 obtuse, projecting about as far as the middle of the third antennal joint, 

 below the tubercle almost straight (so that a line from the apex of the 

 antennal callosity parallel to the posterior eye margin would coincide 

 with the outline of the face below the tubercle). Cheeks shining black, 

 nearly bare. First and second antennal joints black, second reddish at 

 the apex. Third joint of medium size, a trifle longer than wide, sub- 

 quadrate, with the lower outer angle rounded, light reddish-yellow, light 

 pollinose in some reflections. Arista at the extreme base of the joint 

 black, incrassate for about one-half of its length, long loose plumose. 

 Occiput olivaceous, lightly pollinose, superiorly black and inferiorly 

 white pilose. Thorax shining blue, finely punctate in front, more 

 coarsely so posteriorly and on the scutellum, with very short black pile, 

 lengthened into slender bristles on the sides posteriorly and on the 

 border of the scutellum. Scutellum entirely shining blue, its pile and 

 that of the adjacent dorsum yellow (viewed from in front). Pleura 

 shining, with light-coloured pile. Abdomen broadly ovate, widest at the 

 apex of the second segment, everywhere shining blue, less strongly 

 punctured than the scutellum, with short white pile that when viewed 

 from above appears to form narrow oblique bands, meeting at the middle 

 of the anterior margin of the segments. Tarsi and legs, except the knees, 

 black. Wings hyaline, much longer than the abdomen, tegulie and veins 

 testaceous. Posterior cross-vein slightly incurved, apical cross-vein 

 straight, with outward stump at base and about one-third of its length 

 above. Length, 7^ mm. Al, 8 mm. 



One specimen ; Moscow, Idaho ; Prof. J. M. Aldrich. 



This species is closely related to C. IViUisioni, but may be separated 

 from that species by the general colour and by the colour of the third 

 antennal joint. 



