21U TilE CANAUIA.N ENTOMOUXilST. 



Whiiish, opaque, frontal viita concolorous, on both sides margined 



with blackish. Antennae black, whiiish poUinose. Palpi black, proboscis 



yellowish. Dorsum of the thorax adorned with two uninterrupted vittae, 



which slightly converge toward the posterior margin. Abdomen shining 



while, the first segment, except the margins, black, opaque. Second, 



third and fourth segments each with a single basal median viitula, the 



second also bearing a round black spot on each side. Legs black, whiiish 



pollinose, knees and tarsi yellowish, the extreme apex of the latter a little 



darker. Wings milky, veins dilutely subfuscous. 



(Trans, from original description, and com|)ared with type.) 



The s|)ecimens referred to this species in the U. S. N. M. collections 



do noi show a great deal of variation in the character of the thoracic vittre 



unless the specimen mentioned in the note under P. simplex be an 



immature individual of this species. The abdominal spots vary somewhat 



in size. 



Leu cop is bellula Will. 



Williston, Insect Life, Vol. I, No. 8, p. 25S (1889). 



Length, i?4-2 mm. Black, thickly grayish-white dusted. Front 

 with two gently arcuate black stripes; the narrow orbital space perceptibly 

 more whitish. Antennre black, the basal joints shimmering whiiish, 

 arista short. Face in colour like the frontal orbits. Mesonotum with two 

 conspicuous chocolate brown stripes, beginning on the inner side of each 

 humerus and gently converging to the posterior margin. In the middle of 

 the dorsum, before the scutellum, there are two bristles ; the usual 

 bristles on the lateral margin and on the margin of ihe scutellum ; none 

 on the front or vertex. Abdomen more whiiish than the thorax, clothed 

 with short black hairs, first segment with the lateral margins and a 

 posterior band deep brown, second and third segments each with a slender, 

 subinterrupted slripe and a pair of rounded spots, all deep brown in 

 colour, the pair on the second moderately large, on the third smaller, and 

 on the fourih punctiform or minute. Legs black, with the same whitish 

 pruinosity, the immediate tip of femora, the base of the front and hind 

 tibiae, the middle tibiie and the tarsi, except their tip, yellow, the tibije 

 elsewhere and the tip of the tarsi brown or infuscated; in some specimens 

 the tibial' throughout are more brown. Wings hyaline or faintly clouded ; 

 the auxiliary vein distinctly separated from the first longitudinal, except at 

 tip, the last section of the fifth vein a little shorter than the penuliimate 

 one of the fourth. 



The thoracic villa; in the majority of the specimens of this species 

 are dark and quite well marked, sometimes reaching to the hind margin 



