AMERICAN DIFETRA. 277 



Pelastoiieiiriis falcatus u. sp. 



31iile. — Orbital cilia black, face of ordinary width, convex below and concave 

 above in the usual form, with white pollen up to the root of the antennae, but 

 not very bright or silvery ; ))alpi of the same color. Antennae yellowish red, the 

 upper part of the third joint infnscated ; arista with the usual hairs. Color of 

 front not observed. Thorax bronze-green, not very bright, the posterior part 

 with a slight coppery reflection; the sutnral groove at each side has the usual 

 bright white spot (this should, in all cases, be viewed from above, the posterior 

 end of the insect being turned towards the light), and an elongated black vel- 

 vety spot lies behind the root of the wing, extending over the angle of the base 

 of the scutellum. Pleurae with thick grey dust; tegular cilia black, the tegulfe 

 and halteres pale yellow. Abdomen bronze-green, the sides with only thin grey 

 pollen in spots on the segments, the sixth segment covered with pollen ; hypopy- 

 gium stout, rather long, entirely poUinose except on the ventral edge, black; 

 the lamellae are black, with brownish hairs on the edge, and the apical angle is 

 produced into a curved, stout, black, born-like point, longer than the body of the 

 lamella, rather sharp at tip. and provided towards the end with slender brown 

 hairs, which form a distinct bunch on the inner side before the tip. The upper or 

 inner pair of organs, called by Loew the inner lamellae, have in this species a slen- 

 der form and brown color, more yellowish at the base; they have a few slender, 

 long dark hairs on the under side towards the tip. Fore coxae wholly yellow, mid- 

 dle and hind ones black with the apical third yellow ; remainder of legs yellow, 

 the tarsi infuscated towards the tip, the front ones only on the last joint; hind 

 metatarsus about two-thirds the length of the following joint. Wings moderately 

 infuscated, with the third vein curving forward in the middle of its last section, 

 thence almost straight to the margin. 



i^ema/e.— Front purple or bluish purple, the face with a broad brown stripe, the 

 upper part not very white. Thorax with a very distinct purple reflection on the 

 posterior part; the velvety black spot on the sutural groove extends back over 

 the root of the wing, and there is a second silvery spot, but much less bright, 

 between its end and the spot which extends onto the corner of the scutellum. 



Length 3 mm. 



One male, two females, Montreal Island, Quebec, September 1 

 and 8, 1901 (Chagnon). The head of the male was destroyed, 

 after it had been examined. The structure of the hypopygium is 

 very distinctive, while the brown stripe in the face of the female 

 occurs in only a few species. 



Pai'acliu»> viciniis n. sp. 



Male — Face rather wide, parallel, covered with brown dust, the upper part 

 showing the green ground color. Antennae reddish yellow, the third joint 

 slightly larger than usual, darker towards the apex, which has a blunt point: 

 arista with only microscopic pubescence. Front bright green. Cilia of inferior 

 orbit white. 



Thorax bronze-green, without any median stripe, near the scutellum in occa- 

 sional instances with a more violet tinge; scutellum bright green ; pleurae with 

 pale greenish dust. In a side view, the dust in the sutural groove is of the same 

 color; from above it has the usual appearance of a white spot. Halteres and 

 tegulae yellow, the cilia of the latter black. 



TBANS. AM. ENT. SOC. XXX. OCTOBER. 1904. 



