SYNOPSIS OF NORTH AMEEICAN SYEPHIDiE. 257 



vertical diameter of the eyes below the orbit, truncate at tip. Abdo- 

 men cylindrical. Legs simple. Wings : Marginal cell wide open, third 

 longitudinal vein gently sinuate, small cross-vein oblique, joining the 

 fourth longitudinal vein near outer third of discal cell, last section of 

 fourth vein lightly curved, joining the third near the tip. Type of genus 

 S. vittata Wied. 



TABLE OF SPECIES. 



1. — Autenn£B very long, the third joint very short vittata 



Anteun® shorter than the head, first two joints very short, the third transversely 

 elliptical 2 



2. — Yellow cross-bauds of abdomen very broad brevicornis 



Yellow abdominal cross-bauds narrow Pattoni 



Sphecomyia vittata. 



Chrysotoxuin rittatum Wiedemann, Auss. Zw. Ins., ii, 87. 



Psarus on:atus Wiedemann, ibid., 91, 1 ; tab. ix, fig. 7; Macquart Hist. Nat. 



Dipt., i, 491. 

 Sphecomyia vittata Macquart, Dipt., Exot.,ii, 2, 18, 1; tab. iii, fig. 3, id. Eegue 



Animal, Cnv. siv; Osteu Sacken, Cat. Dipt., 254; V. v. Eoder, Ent. Nach- 



rich, 1879, 96. 

 Tyzenhausia respiformis Gorski, Analecta ad Eutomographium proviuciarum oc- 



cidentalis imperii Eossici, 1852, fasc. i, p. 170-174 ; tab. 1, fig. 1 (male). (V. v. 



Eoder, I. c). 

 Sphecomyia vesjyiformis Wahlberg, Vetensk, Acad. Forhandl., 1854, p. 155 ; Zetter- 



stedt. Dipt. Scaud.,xii, 4647; Schiuer, Fauna Austr.,i, 368. 



Bahitat. — New England, Southern States, Minnesota ! Colorado, Nor- 

 way, Siberia. 



<j , 9 . Length, 11 to 12""". Black and yellow varied. Front of female 

 black, yellow on the sides below; frontal triangle shining black, except 

 on the sides, continued over the frontal process, and as a conspicuous 

 stripe to the oral margin. Face, light yellow, opaque ; cheeks with a 

 broa^ shining black stripe. Antennae black, much longer than the 

 head, with short black pile; first and second joints of nearly equal 

 length, third very short, rounded on its end; posterior orbit broadly 

 light yellow, narrower above, and with a fringe of bright yellow pile be- 

 low ; occiput black. Thorax black, nearly opaque, with rather sparse 

 yellowish pile, and yellow spots as follows : a rounded one on each 

 humerus, and two dorsal stripes, abbreviated in front and behind and 

 broadly interrupted in the middle, forming two pairs of elongated spots ; 

 a spot on the meso-pleurae, and one on the sterno-pleuriB, nearly confluent, 

 forming an oval vertical stripe. Scutellum yellow, the rim narrowly 

 black and with black pile. Abdomen shining black, with bright yellow 

 opaque bands; first, second, third, and fourth segments with posterior 

 entire bands; second opaque, with an arcuate band, interrupted and 

 attenuate toward the middle, the outer ends united with the yellow of 

 the posterior margin ; third and fourth segments with bands near the 

 middle of the segments, interrupted by a linear space or entire, and ex- 

 panded at the lateral margins. Legs reddish yellow, coxse black, the 



