SYNOPSIS OF NORTH AMERICAN SYRPHIDiE. 247 



the posterior border, and on each side near the middle with a small trian- 

 gular spot; fourth segment with two fascise, the anterior one narrowly 

 interrupted, the posterior one rather broad, on the hind margin. Hypo- 

 pygium wholly light yellow. Venter blackish brown, the incisures light 

 yellowish. Femora blackish, brownish, and yellow, varied ; front tibial, 

 except the yellow base, brown or black ; middle and hind tibia^. light 

 yellow, the tip dark ochraceous; front tarsi black, middle and hind tarsi 

 like the tip of their tibiae. Wings sub-hyaline, the anterior part brown. 

 Numerous specimens. The pile of the top of the head is blackish. 



Spilomyia hamifera. 



Spilomyia hamifera Loew, Centur., v, 3".5. 



Habitat. — Pennsylvania, Virginia, Florida, Kentucky (Loew, O. S.), 

 Hew Hampshire! 



2 . Length, 17""". Head light yellow, front and face narrowly black 

 vittate, the stripes more or less obsolete on the upper part of each ; 

 cheeks with a brownish black stripe. Antennae brownish, or brown, 

 with the margins of the third joint darker. Vertex black ; occiput 

 blackish, the orbits with whitish pollen. Thorax black, with yellow 

 markings as follows: on the anterior margin of the dorsum with four 

 spots, a vittula reaching from the posterior angle to the suture, curved 

 inwards in front, and two spots in form of an inverted V in front of the 

 scutellum. On the pleurae, beside the humeri, two large spots and a 

 more whitish one above the base of the front coxae, sometimes obsolete. 

 Scutellum yellow, the base brownish or black ; metanotum black, with 

 a yellow spot on each side. Abdomen yellow; first segment, except 

 the lateral angles, black ; each of the following segments with two nar- 

 row black bands, the one on the front margin entire, the median one 

 interrupted, or subinterrupted. The black band in front of each seg- 

 ment is narrowed near the lateral margin by a more or less large pro- 

 cess from the yellow behind. Venter black, posterior margin of each 

 segment yellow. Legs yellow, front tibiae and tarsi black. Anterior 

 portion of wings brown, posterior hyaline. 



One specimen, White Mountains, New Hampshire, July 31. 



Spilomyia pleuralis, n. sp. 

 Habitat. — Mexico ! 



$ . Length, 14""". Face yellow, a slender stripe in the middle, not 

 reaching the antennae, and a slender vittula on each cheek black. An- 

 tennae dark brown, the three joints of nearly equal length. Frontal 

 triangle shining black, narrowly along the eyes and on each side below 

 white pollinose. Dorsum of thorax black, with the following light yel- 

 low marks: the humeri, a small spot on the inner side of each, a small 

 spot near the outer end of the suture, a vittula running from each post- 

 alar callus and continued inwurds as a pollinose spot, and two slender 

 vittulae in the shape of an inverted V in front of the scutellum ; scutel- 

 lum black, narrowly margined with yellow; pleurae light yellow, the 



