THE CANADIAN ENTOMOLOGIST lY.^S 



the middle, a small spot inside its anterior end, an elongate spot on the meso- 

 pleura and a small roundish one below, yellow, pleurae shining. Scutellum yellow, 

 its base and sides black. 



Abdomen shining black, with short inconspicuous black pile, the fourth 

 segment with yellow pile, and longer yellowish pile on the sides of the basal 

 two segnients. Second segment much narrowed basally, forming a rounded 

 sub-carinate swollen area at the base above; on each side with an elongate basal 

 spot. Second to fourth segments with the apices yellow, the anterior yellow 

 band broadest, that on the fourth segment narrowest; in addition, on each 

 side of the third and fourth segments a yellow U. the convexity behind, those 

 on the third segment with the inner arm obsolete. 



Legs black ; trochanters and base of femora, ends of femora and broad 

 bases of the tibiae and their apices, and the first two or three joints of the front 

 four tarsi, yellow or luteous ; femora with double rows of small spines on apical 

 half or quarter. 



Wings hyaline, brown in front, more yellowish basally, third vein with 

 a long stump of vein into the first posterior cell about its middle ; the brown 

 color extends further into the first posterior cell beyond this stump of vein. 



Holotype, female, Orillia, Ontario, May 30, 1920, collected by the author 

 and in his collection. 



Ceria cylindrica, new species. 



Length, 15mm. Male. Eyes over twice as high as wide; abdomen black, 

 with broad yellow segmental apices and elongate yellow triangular spot on each 

 side of the second segment, reaching almost to the yellow apex. 



Male. Face and front yellow, the former separated from the latter by 

 a slightly darker curved line reaching from antennal base to the eyes. Face 

 with a median brown stripe enclosing a narrow yellow line, and the antennal 

 process brown ; cheeks shining black, narrowly connected along oral margin 

 with median brown stripe. Face in profile conically produced downwards, very 

 gently convex ; the apex of the oral margin is almost as far below the lower 

 b;)rder of the eyes as the antennal process is above. Antennal peduncle broad- 

 est at apex when viewed dorsally, with a shallow longitudinal median line and a 

 sub-apical depression or groove ; not as long as broad ; viewed laterally it is slight- 

 ly longer than broad, being compressed, so that it is about one-third as thick 

 when viewed laterally as dorsally. Antennae opaque brown, third joint opaque 

 black, style yellow, with silvery pubescence, first joint obscurely luteous basally, 

 longer than the second, third joint slightly shorter than the second. Vertical 

 triangle yellow, the ocellar tubercle black ; posterior orbits black with yellow 

 pollen along the eyes ; pile, only on cheeks and posterior orbits, sparse, yellow, 

 shorter above. 



Thorax finely scrobiculate, with extremely short black pile, slightly shin- 

 ing black; the humeri, a spot at each end of the suture, a small, indistinct spot 

 on each side of the middle of the suture; a stripe running from the post alar 

 callosities almost to the suture, the mesopleura and a spot below, yellow, post 

 alar callosities reddish, with yellow pile; pleurae with inconspicuous yellow pile. 



