174 THiE CANADIAN ENTOMOLOGIST 



Length, 10mm. Male. Face and front creamy yellow, the middle of the 

 face and oral margin translucent : face with inconspicuous pile, front with short, 

 sparse, pallid pile. Antennae yellow : third joint above, and the arista, black. 

 Vertical triangle with long black pile. Cheeks blackish, a yellow spot below the 

 eyes. Posterior orbits blackish, with grayish pollen and silvery pile on the lower 

 half, yellow pollen and black and yellow pile intermixed on the upper half. 



Thorax metallic greenish black, with tawny pile ; lateral stripes broad, 

 whitish, to the suture, thence indistinct to the post alar callosities. A spot above 

 the front coxae, a large mesopleural spot and a smaller one below it, and the 

 sterno-pleurae, yellowish white. Scutellum pale yellow, with black pile. 



Abdomen shining black, its lateral margins narrowly yellow ; second seg- 

 ment with a moderately narrow arched band about the middle, the ends narrowed 

 slightly towards the margin, where it connects with the yellow margin, a small 

 triangular notch in the middle of the yellow band. Third segment with similar, 

 but slightly broader band, except that there is a slight projection posteriorly on 

 each side of the median notch. The third band is much narrower on the lateral 

 quarter, more deeply notched medially, and more produced posteriorly on each 

 side of the notch. Fifth segment yellowish red, with a small median triangular 

 black dash and a large black spot on each side, reaching nearly to the hind mar- 

 gin. Hypopygium as described above. 



Legs pale yellowish, with appressed black pile; tarsi reddish. 



Wings hyaline. Squamae yellowish with a blackish or reddish border and 

 short reddish pile. 



Holotypc, male, Cranbro.ik. B. C, May 25, 1919, collected by C B. D. 

 Garrett, in the collection of Mr. Garrett. 



CerJa ontarioensis, new species. 

 Very much like C. abbrcviata superficially but without the antennal 



pedicel, and with U's on the third and fourth abdominal segments; differs from 

 C. signifera in having black legs and different arrangement of yellow on the 

 face, etc. 



Female. Length, about 10.5mm. Face black, with a broad obtuseJy 

 conical spot on each side below the antennae connecting broadly on the sides 

 with an elongate spot at the orbits which runs downwards towards the oral 

 margin about four-fifths of the distance, the two stripes converging below; 

 above these, small round orbital spots opposite the antennae, an obscure median 

 facial stripe and an obscure arcuate spot on the cheeks, its rounded side towards 

 the front, yellow. Face almost perpendicular in profile, a little convex above 

 the oral margin. Front black, with an interrupted abbreviated, yellow arcuate 

 spot above the antennse in a reddish brown field. Eyes separated by the width 

 of one eye. Posterior orbits black with yellowish pollen bordering the eyes. 

 Pile short, sparse, pale whitish, confined to the cheeks and posterior orbits. 

 Antennae black, the first joint luteous on the basal half. Antennal process oval, 

 ver}^ short, luteous about the antennal base. 



Thorax dull black, finely scrobiculate, with inconspicuous short black 

 hairs; the humeri, a cordate spot in front of the suture at the sides, a vitula 

 running from the post alar callosities to the suture and curving inwards about 



