116 CR. Osten Sacken: Diptera 



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

 species is identical with that species of Prof. Kondani'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 $$, two specimens. 



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



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

 but different. 



Baccha n. ST^. A single male; dififers from all the described 

 asiatic species by its uniformly brownish wings. 



Ascia s,"^. A fragment. 



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



JEristalis. Three species, represented by one specimen each. 



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

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



Helophilus celeher n. sp. $. JEyes glabrous, sepa7'ated 

 hy a tnoderately hroad front; tJiorax with four yelloiu stripes; 

 abdomen red, ivith hlack triangles on the posterior part of Seg- 

 ments 2 — 4; legs yellowish-red; hind tibiae inerassate. 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 expandä 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; 



