248 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



sutures black. Abdomen black, lightly shining, in shape broadest at 

 base of the second segment, then diminishing in nearly a straight line 

 on each side to the tip of the fourth ; second segment with a small yel- 

 low spot on each side; the second, third, and fourth each with a larger, 

 sub-triangular spot on each side; second and third segments each with 

 a slender posterior cross-band, that on the third narrowly interrupted 

 in the middle; fourth segment with a large spot on each posterior an- 

 gle, forming a broadly interrupted cross-band. Legs, including the 

 coxie, light yellow, the tips of front and hind tibiae and their tarsi 

 brown, hind femora broadly black along their upper surface except at 

 their base. Wings hyaline, with the usual brown border in front. 

 One specimen, in the Osten Sacken collection at Cambridge. 



Spilomyia (Mixtemyia) quadrifasciata. (Plate XII, fig. 3.) 



Faragms quadrifandutun Say, Loug's Expecl., Appeud., 377 ; Compl. Wr.,i, 257. 

 PsaruH quailrifaseiatus Wiedemann, Aup.b. Zw. Ins., ii, 91, 2. 

 Mixtemyia quadrifasciata Macquart, Hist. Nat. Dipt.,i. 491; tab. xi, fig. 8; 

 Osten Saclveii, Cat. Dipt, 139. 



Habitat. — Oauada, New Hampshire, Massachusetts, Connecticut, New 

 York ! 



$ ^ 9 . Length, 12™™. Vertex black with whitish pile; below, the front 

 of the female has a narrow yellow stripe of even width along the ej'es ; 

 frontal triangle narrowly black immediately above the antennae ; ver- 

 tical triangle long, yellow in front. Antennae reddish brown or brown- 

 ish black, the tirst joint reddish or yellowish, moderately elongated, 

 second joint much so, nearly twice as long as the tirst ; third joint 

 trapezoidal, a half longer than wide ; arista yellow. Thorax with a 

 small spot on the humeri, a larger one to the inner side, a slender vittula 

 above the wings, two slender spots in the form of an inverted V in 

 front of the scutellum, the narrow margin of the scutellum, a large 

 elongate spot on the meso-i)leur8e, a large rounded one on the steruo- 

 pleurae, and a smaller one, sometimes obsolete, above the front coxae, 

 yellow. Abdomen elongate, cylindrical, scarcely wider than the thorax, 

 with four yellow bands, the first broad, conspicuous, strongly arcuate, 

 the convexity in front, situated on the second segment : the second and 

 third till the middle of the third and fourth segments, slender, only a 

 little arcuated, the second narrowly interrupted in the middle, the third 

 usually entire ; the fourth band on the posterior margin of the fourth 

 segment ; on the ])Osterior angles of the second and third segments 

 there is a small yellow spot, extending a short distance narrowly in- 

 ward. The abdomen is a little shining, except on the second segment, 

 with a faint bluish reflection ; the pile on the hind part whitish. Base 

 of hind and middle femora, basal two-thirds of hind and middle tibiae, 

 and narrow base of front tibiae light yellow; front legs elsewhere red- 

 di.sh brown, the tarsi more black ; tip of middle and hind tibiae and 

 their tarsi light ochraceous; hind femora, except the base, nearly black. 

 Wings elongate, brownish along the front border, hyaline behind. 



