SYNOPSIS OF NORTH AMERICAN SYRPHIDiE. 17 



ADDITIONAL NORTH AMERICAN SPECIES. 



Chrysotoxum nigrita (Fabr.) Wiedemanu, Aus8. Zw. lus., ii, 88, 2. — Jamaica. 

 tSyrphus nigrita Fabricius, Eut. Syst., iv, 292, 49. 

 Mnlio nigrita Fabricius, Syst. Antl., 183, 1. 



Chrysotoxum flavifrons Macqnart, Dipt. Exot., ii, 2, 17, 2; tab. iii, fig. 2.— New- 

 foundland. 



It will be impossible to determine this species from the descriptioa 

 given by Macquart. For this reason I consider it merely as a catalogue 

 name, that should be dropped. 



PARAGUS. 



ParaguB Latreille, Dictiotm. d'Hist. Natur. D6terville, vol. xxiv; Hist, Nat.des 

 Crust, et Ins., xiv, 359, 1804. 



Small, nearly bare, rather short species, with the abdomen curved 

 downward at the tip, of a black or greenish black color, with yellow on 

 the face and nsn;illy more or less reddish on the abdomen. Head hem- 

 ispherical, somewhat flattened, broader than the thorax. AuteunfB 

 about as long as the head, directed forward; first and second joints 

 short, third longer than the iirst two together, rather slender, arista 

 before the middle, bare. Face in i)rofile somewhat projecting below, 

 convex, with an obtuse tubercle. Eyes pilose, narrowly contiguous in 

 the male. Abdomen as wide as the thorax and of nearly equal width 

 throughout, gently convex above, twice or mere as long as the thorax, 

 with a shallow transverse depression on each segment, the distal end 

 bent downward. Legs moderately slender, the hind metatarsi much 

 thickened, as long as the remaining joints together. Marginal cell of 

 wing open; third longitudinal vein straight, anterior cross-vein near 

 the base of discal cell, the last section of fourth vein sinuate, terminat- 

 ing in the third vein in nearly a right angle, at a considerable distance 

 before the tip. 



TABLE OF SPECIES. 



1. — Scutellum with a yellow border; face of male without a black median stripe; 



front of female narrow above bicolor 



Scutellum without a yellow border ; face in both sexes with a black median stripe ; 

 front in female of nearly equal width ........ 2 



2. — Abdomen with more or less red on the dorsum 3 



Abdomen wholly greenish black angustifrons 



3. — Vertical triangle in male large tibialis 



Vertical triangle not unusually large dimidiatus 



Paragus angustifrons. 



Paragus angustifrons Loew, Centur., iv, 64. 



Habitat. — Atlantic States ! 



9 . Length, 5™™. Head shining, somewhat metallic black, front nar- 

 row, immaculate, face nearly perpendicular, but very little projecting, 



