390 C. R. OSTEN SACKEN'S PRODROME 



Ilab. Maryland, July and beginning of August (P. R. Uhler and Mus. Philad. Entom. 

 Soc). Six females. The single male, which I have, resembles the females in all essential 

 characters ; the yellow stripes on the abdomen are very distinct. Two females and a male, 

 also from Maryland, are smaller, abdomen altogether brown, front tibiae, except the base, 

 and hind legs, except base of tarsi, almost entirely brown. I am doubtful whether they be- 

 long here. 



Macquart's C. trlnotatus is very vaguely described, especially the wings, (only briefly 

 mentioned in the diagnosis). It may or may not be C. niorosus. 



19. Chiysops vittatus. 



Ohrysops vittatus Wiedemann, Dipt. Exot., i, p. 106, 7 ; Auss. Zweifl., i, p. 200. 



C/iri/sops areolatus Walker, List, etc., i, p. 197. 



Onri/sops lineatus Jaennicke, Neue Exot. Dipt., p. 26. 



S . The hyaline trianQ;le separatln<i the crossband from the apical spot does not reach the second longi- 

 tudinal vein ; first basal cell to a consiilerable extent infnscated ; the second .at the proximal end only; frontal 

 callosity .and scutellum reddish ; abdomen yellow with four longitudinal black lines. 



Length, 8-10 mm. 



3 . The second basal cell is, like the first, to a considerable extent infuscated. 



Female. Face and facial callosities ferruginous-yellowish; frontal callosity yellowish- 

 red ; the pollen covering the front is yellow. Antennae yellowish-red, third joint reddish 

 at base, brown or black toward the tip. The usual stripes on the thorax are broad and well 

 marked, yellow ; the intervening spaces are brown ; of the latter, the middle one is narrow. 

 Scutellum reddish-yellow. Abdomen yellow, with four longitudinal brown stripes, usually 

 reaching the fifth segment ; the lateral stripes usually begin on the second segment only ; 

 the sixth segment is brown, with vestiges of yellow spots and a yellow hind margin. Ven- 

 ter yellow, blackish at tip and with two more or less distinct brown lateral stripes. Prevail- 

 ing color of the legs yellowish-red; tarsi, except at base, brownish. Wings: costal and first 

 basal cells Ijrown ; the latter with a small hyaline space before the distal end ; second basal 

 cell hyaline, with only a small )>rown streak at the proximal end ; anal cell and anal angle 

 hyaline ; the crossband fills out the fourth posterior cell, except a very narrow, almost im- 

 perceptible, hyaline border on the posterior margin of the wing ; the apical spot is broad 

 and fills out the whole marginal and first submarginal cells, and the greater part of the sec- 

 ond submarglnal, except its proximal end, with a corresponding little hyaline spot in the 

 first submarginal cell ; posteriorly the crossband reaches be3-ond the intercalary vein in the 

 shape of a more or less distinct brown cloud, crossing the fifth posterior cell and sometimes 

 invading the tip of the anal cell ; the proximal ends of the discal and of the fifth posterior 

 cells are usually hyaline. 



Hah. Middle and Northern States; not rare. A specimen from North Conway, N. H., 

 is much darker in its general coloring, especially on the thorax. 



The male, of which I have only a single, somewhat immature specimen, is in all respects 

 like the female, except that the second basal cell is infuscated to a greater extent. 



The red frontal callosity and scutellum render this species easily recognizable, and for 

 this reason the synonymies are hardly doubtful. Mr. Walker seems to have described as 



