134 MB. E. E. AUSTEN ON NEW DIFIEEOrS INSECTS. [Jan. 17, 



(Biol. Ceutr.-Amer., Diptera, iii. 38), from Mexico, and Ocyptamus 

 {Pipiza) cosfalis, Walker (Linn. Trans, xvii. 342, 31) from S. 

 America ; it is, however, distinguished from both by its yellow 

 face and legs, and by the colour of its abdomen, as also by its 

 abdomen not being clothed with white, short, curved hairs, by the 

 wings being without a brown fore-border, by the third longitudinal 

 vein being straight, and by its smaller size. 



Pipiza cosfalis, Walker, Linn. Trans, xvii. 342, from S. America, 

 is an Ocyptamus, allied to 0. cceruleus {Bacclia ccerulea), Will., 

 Biol. Centr.-Amer., Diptera, vol. iii. p. 38. 



Pipiza pnca, Wlk., Tr. Eut. Soc. n. ser. iv. 156, from the Valley 

 of the Amazon, = Ocyptamus {Syrphus) trir/onus, Wied. 



Pipjiza cJolosa, Wlk., he. cit., from the Yalley of the Amazon, = 

 Ocyptamus climidiatus, I'. ( d )• 



Pipiza clivisa, Wlk., Joe. cit., from Vera Cruz, = Ocyptamus 

 dimicliatus, F. ( 5 ). 



Syiphus stolo, Wlk., Dipt. Saunders. 241, from Brazil, is an 

 Ocyptamus. The type is headless. The wings are apparently 

 precisely similar to those of the S of 0. dimidiatus, F. ; but the 

 specimen is distingaished from this species by the j'ellowish 

 markings on the sides of the abdominal segments, as well as by the 

 yellower colour of the first two pairs of legs. 



Syrphus antiphates, AVlk., List Dipt. iii. 589, is an Ocyptamus. 



Syrphus p>ec(s, Wlk., loc. cit. 590, from ? = Ocyptamus 



fuscipennis, Say. — The head of Walker's t}^e, as described by him, 

 "has been stuck on, and does not belong to it. 



SyipTius amissas, Wlk., List Dipt. iii. 589, from Georgia, = 

 Ocyptamus fuscipennis, Say. Syiphus radaca, Wlk., List Dipt. iii. 

 590, from Florida, = Ocyptamus fuscipennis, Say, var. fascipennis, 

 Macq. Walker's description is drawn from two $ specimens, and 

 not from a cj , as stated by him. 



The synonymy of the two last-mentioned species has already 

 been recognized by WilUston, Synopsis, i^c, p. 119. 



Syrphus iridipennis, Wlk. Linn. Trans, xvii. 345, from S. 

 America, is an Ocyptamus, closely allied to OcypAamus funebris, 

 Macq. It may, indeed, be only a variety of the latter species, 

 though the semi-hyaline space beneath the apex of the wing in the 

 latter is much more indistinct in Walker's species, in which, again, 

 there is a semi-hyaline streak in the middle of the submarginal, 

 first posterior, and discal cells. The wings of Walker's type are, 

 moreover, slightly narrower than those of specimens of 0. funebris, 

 Macq., in the collection. 



Syiphus tarscdis, Wlk., Linn. Trans, xvii. 345, from S. America, 

 is an Ocyptamus. There is a narrow pale yellow stripe on each 

 side of the third abdominal segment, starting from the anterior 

 angle and extending a little more than half the length of the 

 scment, and a mark of the same colour shaped like an isosceles 

 triangle on each side of the fourth segment, extending from the 

 anterior angle not quite to the middle of the segment. The 



