SYEPHUS. 



17 



Hab. Mexico, Omilteme 8000 feet, Xucumanatlan 7000 feet, both in Guerrero 

 (H. H. Smith). 



One male, three females. 



Nearest allied to S. diversipes, Macq. 



6. Syrphus ribesii. 



Musca ribesii, Liim. Fauna Suecica, p. 1816. (Eor tlie remainder of synonymy, see Willist. Synopsis 

 jNT.-Ahi. Syrpliidse, p. 77 \) 



Hab. Etjrope. — Noeth Ameeica, Atlantic, Middle and Pacific States K — Mexico, 

 Sierra de las Aguas Escondidas in Guerrero 9000 feet (H. H. Smith). 



A male specimen from Western Mexico presents most of the essential characters of 

 this species, but with certain differences. The pile of the face is black, not yellow, and 

 the yellow spots of the second abdominal segment are distinctly separated from the 

 margin. Length 9 millim. A female specimen from the same locality is a little larger 

 and has the yellow spots of the second segment broadly contiguous with the margin, 

 the femora yellow at the base (the middle femora very narrowly black), the hind femora 

 with a broad brown ring, and the hind tibise and tarsi brown. Length 11 millim. 



7. Syrphus bisinuatus, sp. n., $ • 



Front mueh narrowed above, shining inetallic hlack near the ocelli and in the middle below, on the sides 

 yellow-pollinose, the black extending to the antenna? ; pile black. Antennse red, the first two joints 

 brownish above ; the third joint broadly black on the upper part, in shape obtusely pointed, between two 

 and three tiines as long as broad, its upper border straight, the lower border convex. Face and cheeks 

 yellow, with yellow pile. Mesonotum opaque olivaceous-green, with yellow pile ; scutellum light yellow, 

 with black pile. The yellow spots of the seeond abdominal segment extend forward to the lateral margin : 

 the bands of the second, third, and fourth segments are not very broad, reaching the lateral margins in 

 their full, or nearly their full, width — on their anterior side convex in the middle, and with a considerable 

 concavity on each side, on their posterior side there is a broad shallow emarginaiion or concavity ; fourth 

 segment narrowly yellow behind, forming a band with the yellow of the anterior angles of the fifth 

 segment. Legs light yellow, the narrow base of all the femora black ; the hind legs in large part 

 brownish, with the knees broadly, and the base of the metatarsi yellow. Wings hyaline ; stigma yellow. 



Length 10-3 2 millim. 



Hab. Mexico, Omilteme in Guerrero 8000 feet (H. II . Smith) ; Costa Eica, Volcan 

 de Irazu 6000 to 7000 feet, Eio Sucio (Rogers). 



Seven specimens. 



8. Syrphus U. = a, -T^.;.,^> 



Syrphus gastrostactus, Willist. Trans. Aro. Ent. Soc. xv. p.*264 (nec Wiedern.) \ 



Face much narrowed below ; light ycllow, on the sides opaque white ; clothed with white pile. Cheeks very 

 narrow, black. Antennaa black; third joint nearly orbicular. Frontal triangle yellow, with a large 

 triangular black spot, reaching acutely to the suture ; clothed with black pile. Eyes bare. Mesonotum 

 anteriorly with a conspicuous light yellow rufF j in colour dark shining bronze, with black pile. Scutellum 



biol. centr.-amer., Dipt., Vol. III., Hecember 1891. d 



