OMEGASYRPHTJS. — CONOPS. 



OMEGASYRPHUS. 



Omegasyrphus, Giglio-Tos, Bollett. dei Musei di Zool. ed Anat. comp. della R. Univ. di Torino, 

 vi. no. 108, p. 4, figg. (Sept. 1891). 



This genus apparently includes such species as Microdon coarctatns, Loew, and 

 M. balioytems, Loew. The type-species, from Mexico, is not yet described or 

 indicated. 



MEGAMETOPON. 



Megametopon, Giglio-Tos, Bollett. dei Musei di Zool. ed Anat. comp. della R. Univ. di Torino, 



vi. no. 108, p. 5, figg. ( 9 ) (Sept. 1891). 

 Ophromyia, Williston, antea, p. 55, Tab. II. figg. l,la,b (Dec. 1891). 



Dr. Giglio-Tos's paper, containing the description of this genus, was not received 

 until too late to change the name in the preceding pages, but his name has priority. 

 The species described by me will be known as M. nasicum, inasmuch as the type of 

 Megametopon has not yet been described. If the species are the same, Giglio-Tos's 

 figures of the male front and of the arista are not quite correct. 



Fam. COffOPIDtf! *. 



CONOPS. 



Conops, Linnseus, Fauna Svecica, p. 467 (1761). 



Leopoldius, Rondani, Nuovi Ann. Scienze Nat. Bologna, x. p. 35 (1843). 

 Conopcejus, Rondani, Mag. Zool. 1845, Gen. Ital. Conop. p. 4. 

 Brachiglossum, Rondani, Dipt. Ital. Prodr. i. p. 56 (1856) . 

 Sphyxosoma, Rondani, loc. cit. 

 Conopilla, Rondani, loc. cit. 



Synopsis of the Central-American species. >im ■ r 



1. Third joint of the antennae distinctly shorter than the second ... 2- 

 Third joint of the antennse at least as long as the second .... 3. 



2. First posterior cell hyaline pleural pollinose stripe indistinct above . discalis, sp. n. 

 Pirst posterior cell in large part clouded ; pleural pollinose stripe 



distinctly liraited above anthreas, sp. n. 



3. Face black Sp. (no. 4). 



Face yellow , .... 4. 



4. Cheeks yellow , 5. 



Cheeks brown; large species sequax, sp. n. 



5. Pirst posterior cell hyaline, except at its base, the subraarginal cell 



also partly hyaline sylvosuu, Willist. 



First posterior cell brown along the whole anterior part Sp. (no. 5). 



* By S. W. Williston. 



