SOUTH AMERICAN DIPTERA. 155 



Mydas ventralis Gerst. Stett. Ent. Zeit. 1868, 102, noai. nov. pro Mydas rufi- 



ventris Loew, Berl. Ent. Zeit. x, 14, preoe. Macq. vide supra. — Brazil, 



Mexico, California, 

 testaceiventris Macq. Dipt. Exot. Suppl. 4, 61, pi. 5, f. 6, Gerst. Stett. Ent. 



1868, 99, 27.— Uruguay, 

 virg-atus Wied. Mongr. 51, 18, pi. o4, f. 19; id. Auss. zw. Ins. ii, 630, 35. West. 



Arcan. Ent. i, 53 Gerst. Stett. P^nt. Zeit. 1868, 97, 15.— Brazil. 

 sp. Will. Kans. Acad. Sci. 29tli Ann. Meet. 56. — Brazil. 



DOLICHOGASTER. 

 Macq. Dipt. Exot. Suppl. iii, 178, 1848. 

 iopterus Wied. Auss. zw. Ins. i, 241. Eoeder, Stett. Ent. Zeit. 1883, 426. Will. 

 Kans. Acad. Sci. 29th Ann. Meet. 57. 

 Dolichogaster brevicornis Wied. Mongr. 45, pi. 53, f. 9; id. Dipt. Exot. i, 111; 

 id. Auss. zw. Ins. i, 241. Westw. Acarn. Ent. i, 52 {Mydas). Macq. 

 Dipt. Exot. Suppl. 3, 17, pi. ii, f. 2. Gerst. Stett. Ent. Zeit. 1868, 103. 

 — Brazil. 



MBGASCELUS.® 

 Phil. chil. Dipt. 1865. 

 nigricornis Phil. chil. Dipt. 683. 



The Habitat of the Following is Not Known. 

 Mydas atratus Macq. Dipt. Exot. i, 2, 127. 



" continnus Macq. Dipt. Exot. Suppl. ii, 2, 177, pi. ii. 

 " fasciatus Wied. Mongr. 50, pi. 54, f. 7 ; id. Auss. zw. Ins. i, 243. 

 " politus Wied. Monor. 43, pi. 53, f. 7; id. Auss. zw. Ins. i, 240. Westw. Fam. 

 Midas. 51. Gerst. Stett. Ent. Zeit. 1868, 94, 1. 



* The family location of this genus is a matter of some doubt. Schiner (Dipt. 

 Novara 151) states that it is the same as Dolichogaster ; but Gerstaecker (Stett. 

 Ent. Zeit. 70) excludes it altogether from the family. 



TRANS. AM. ENT. SOC, XXVII. JANUARY. 1901. 



