28 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.70 



scription of similis states that the fourth and fifth abdominal seg- 

 ments are yellow. Immature specimens before me have these seg- 

 ments a diffuse yellowish brown, but well-colored specimens have 

 the yellow stripes in strong contrast to the black of the rest of the 

 tergites. Seven males, nine females. 



Type locality. — Valparaiso, Chile (A. Faz). 



Ty^e.— Male, Cat. No. 28748, U.S.N.M. 



Genus SCAEVA Fabricius 



Scaeva Fabricius, Systema Antliat., 1805, p. 248. 



Lasiopticus Rondani, Nouv. Annal. Sci. Nat. Bologna, ser. 2, vol. 2, 1844, 



p. 459. 

 Catabomha Osten Sacken, Bull. U. S. Geol. Surv., vol. 3, 1877, p. 325. 



This genus, also widely known under the name of GatdboTriba and 

 Lasiopticus^ is represented in Chile by two species. 



It appears quite certain that one of them is the same species as 

 that described by Macquart under the name Syrphus rrielanostoina^ 

 especially as it is stated in the Fauna Chilena^ to resemble S. 

 pyrastn of Europe, differing by its more narrow form and the 

 abdominal spots being less broad. 



SCAEVA MELANOSTOMA (Macquart) 



Syrphus melanostomus Macquart, Dipt. Exot., vol 2, pt. 2, 1842, p. 87. 



Syrphus latifaoies Macquart, Dipt. Exot., suppl. 4, 1849, p. 152. 



Syrphus sexguttatus V. d. Wulp, Tijdschr., v. Bntomol., vol. 25, 1882, p. 135, 



Male and female. — Eyes hairy ; front and face very broad, inflated ; 

 ocellar triangle of male black aeneous and black pilose, the three 

 sides equal in length; the frontal triangle as broad as the face, 

 rather densely black pilose; in female the width of front across 

 ocelli is greater than length of arista, the lower portion of the front 

 as broad as the face ; the front yellowish except for a shining black 

 band extending between the eyes across the ocelli; antennae and 

 arista dark brown, length of arista a little shorter than antenna; 

 face moderately protruding below, the tubercle prominent and the 

 anterior oral margin slightly projecting; face largely yellow, the 

 jowls and the oral margin shining black, the tubercle brownish; a 

 loose row of blackish hairs extending from base of antenna down 

 close to the side of the face, remainder of pile pale and inconspicuous; 

 mesonotum and disk of scutellum greenish aeneous, somewhat 

 yellowish around the side and hind margins; clothed with pale 

 loose pile; bases of fore and mid femora, all but the apex of hind 

 femora, and the tarsi black, remainder of femora and tibiae 

 yellowish ; abdomen black, the second, third, and fourth tergites each 



8 Vol. 7, 1856, p. 410. 



