THE CANADIAN ENTOMOLOGIST. 129 



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deeply punctured like the mesonotum, with a. loose fringe of fine white 

 pile showing from below tl^e margin. Abdomen broadly elliptical, every- 

 where deeply and conspicuously punctured and subshining. Pile rather 

 abundant, white. When viewed from above and at one side the pile of 

 the third and fourth segments seems to form broad arcuate bands curving 

 from the apical corner of the segment inwardly, Legs white pilose ; all 

 the femora except a narrow tip black; tibise reddish-yellow with an 

 indication of a brown median band, more pronounced on the posterior 

 pair. Tarsi yellow, two apical joints darkened. Posterior femora with 

 several short spinous bristles below near the apex. Wings short, broad, 

 uniformly tinged with yellow ; veins yellow. 



Length, S}4 mm.; al., 6^^ mm. 



Two specimens : West Point, Nebraska, September 9. 



This species is very closely allied to C. soror/'a, Will., from Mexico 

 and to C. petulca from Washington State. In the shape of the antenna* 

 and outline of the face it agrees precisely with petulca but differs in the 

 absence of the scutellar bristles. This is the only character mentioned 

 by Williston in the Biologia C. A. as distinguishing sororia from petulca. 

 The character, however, in this species which leads me to consider it 

 very distinct is the deep punctuation. The front of C. sororia is 

 described as " shining metallic," and the mesonotum as " metallic 

 green," which would certainly indicate that these parts are not deeply 

 and closely punctured. In this species the front and mesonotum are 

 very deeply and conspicuously punctured, so that they have a roughened, 

 granulated appearance and are subopaque. The wings in this species 

 are much more yellowish than the description of C. sororia would seem 

 to indicate they are in that species, and there are several other differences. 

 10. Melanostoma mellinum, Linn. 



Two specimens : Cook's Inlet, Alaska ; coll. L. L. Dyche. 

 I r. Platychirus chaetopodus, Williston. Synopsis N. A. Syrphidse, p. 

 59, 1896. 



Four male specimens were taken on the Pine Ridge in North-west- 

 ern Nebraska by the writer during July, 1896. The species was described 

 from the State of Washington and Snow has recently recorded it from 

 Colorado. The abdominal markings are larger than the description seems 

 to imply. 

 12. Syrphus intriuhin, O. S. 



Four specimens from Cook's Inlet, Alaska ; coll. L. L. Dyche. The 



