116 C. R. Osten Sacken: Diptera 



Wiedemann's latin diagnosis. As far as I can remember, one of my 

 species is identical with that species of Prof. Rondani's. 



>^ Syrphus aegrotus (F.) Wied. (Compare 0. S. Enumer., 49). 



Three specimens, in two of which there is no hyaline space at the 



base of the wing, a case mentioned by Wiedemann already, as a 

 variety. 



Sphaerophoria $Q, two specimens. 



V Baccha pedicellata Dol. 1 Bijdr. 9 (Java). One specimen, 



Saccha sp. A fragment; the species allied to B. pedicellata, 

 but different. 



Baccha n. sp. A single male; differs from all the described 

 asiatic species by its uniformly brownish wings. 



Ascia ^Tp. A fragment. 



Eristalis errans F. A dozen specimens (5§, 7 $ .) 



Eristalis. Three species, represented by one specimen each. 



HelophiliiS $Q, two specimens (in bad condition). Must re- 

 semble alhiceps v. d, W., but cannot be the same species. 



Helophilus celeher n. sp. $. Eyes glabrous, separated 

 by a moderately broad front; tliorax with four yellow stripes; 

 abdomen red, with black triangles on the posterior part of seg- 

 ments 2 — 4; legs yellowish-red; hind tibiae incrassate. Length 11 mm. 



Face silvery, descending straight in the profile from the antennae 

 to the oral margin; a black, shining triangle above the antennae, en- 

 closed between the silvery lower frontal orbits, which meet before the 

 beginning of the narrow portion of the front, and assume there a more 

 golden tinge; the upper, narrower part of the front is black, slightly 

 yellowish -pulverulent in the middle; it gradually expands towards the 

 vertex, where is a little broader than the ocellar triangle. Antennae 

 bright yellowish-red; arista reddish at base, glabrous. Mesonotum with 

 four yellow stripes , contiguous near the posterior margin , in such a 

 way that the intervening three velvet black spaces end in a point pos- 

 teriorly. Scutellum black (? soiled in the specimen). Abdomen red; 



