134 ME. E. E. AUSTE>' ON NEW DIFJEROUS INSECTS. [Jan, 17, 



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

 {Pipiza) cosfalis, AValkei' (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 

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

 vein being straight, and by its smaller size. 



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

 is an Ociiptamus, allied to 0. aendeus (^BaccJia aerulea), AVill., 

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



Pipiza 2)ica, AVlk., Tr. Eut. Soc. n. ser. iv. 156, from the Valley 

 of the Amazon, = Oojptamus (Sijqjhus) trtr/onus, AVied. 



Pipnza dolosa, Wlk., loc. cit., from the A'alley of the Amazon, = 

 Oaipjtamus dimidiatus, F. ( d )• 



Pipiza divisa, AVlk., loc. cit., from Vera Cruz, = Ociiptamus 

 dimidiatus, F. ( $ ). 



Syrp>7ius sfolo, 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 distinguished from this species by the yellowish 

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

 yellower colour of the hr.st two pairs of legs. 



Syrjihus antiphaiis, Wlk., List Dipt. iii. 589, is an Ocyptamus. 



Syrphus peas, Wlk., loc. cit. 591), from ? = Ocyptamus 



fuscipennis, Say.— The head of Wallier's type, as described by him, 

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



SyrpJius amissas, AVlk., List Dipt. iii. 589, from Georgia, = 

 Ocyptamus fuscipennis, 8ay. Syijjhus radaca, AVlk., List Dipt. iii. 

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

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

 not from a c? , as stated by him. 



The synonymy of the two last-mentioned species has already 

 been recognized by AVilhston, Synopsis, &c., p. 119. 



tSyiphus iridijjennis, Wlk. Linn. Trans, xvii. 345, from S. 

 America, is an Ocyptamus, closely allied to Ocyptamus 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 AValker'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 sjjecnneus of 0. funebris, 

 Macq., in the collection. 



Syrphus tarsalis, 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 

 segment, 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 



