156 DEX1DAE. 



rubriventris 'Macquart, Dipt. Exot. 1 Sup pi. 1:8, G; Tab XX, 



f. 10. - Yucatan. 



strenua R. Desvoidy, Myod. 315, 2 (Ztlin). -- San Domingo. 

 Thoinae Wiedemann, Auss. Z\v. II, 379. St. Thomas (Wicd.); 



Jamaica (Walker, List, IV, 840). 



Sericocera. 



Macquart, Hist. Nat. Dipt. II, 165; 1835. 



pictipennis Macquart, Dipt. Exot. II, 3, 67, 1; Tab. VII, f. 5. - 

 Philadelphia. 



Observation. This genus of Macquart's seems to have con- 

 tained a mixture of heterogeneous forms, which Schiner distributed 

 among the genera Olwieria, Peteinrt (Section Tachinina) and Mintlio, 

 Thelaira and Melania (Section Dexina). S. pidipatnis Macquart, 

 judging from the figure, belongs to the Dexidae. 



ftEelanopliora. 



Meigen, in Illiger's Magaz. II; 1803. 



? diabroticae Shinier, Amer. Naturalist, V, 219; f. 60 (the author 

 calls it MelcmospJiora, perhaps Melanophora?). - - Illinois 'para- 

 sitic on Diabrotica vittatci). 



distincta R. Desvoidy, Myod. 273 (Lmnemyia). Europe; Philadelphia. 

 nigripes R. Desvoidy, Myod. 58 (Marshamia). - - North America. 

 * roralis Linne etc. ; Meigen , System. Beschr. IV, 284. - Europe and 

 North America (see Loew, Sillim. Journ. Vol. XXXVII, p. 31S). 



Illig-eria. 



R. Desvoidy, Myod. 273; 1830. 



Aelops Walker, List, etc. IV, 796. - - Georgia. 

 Corytlms Walker, List, etc. IV, 797. - - Georgia. 

 Helymns Walker, List, etc. IV, 795. Maine. 



Observation. Judging from the descriptions, the insects, which 

 Mr. Walker places in this genus, have very little in common, 

 and belong to different genera. 



Theresia. 



R. Desvoidy, Myod 325; 1830. 

 tandrec R. Desvoidy, Myod 326. - - Carolina. 



Microplithalma. 



Macquart, Dipt. Exot. II, 3, 84; 1843. 



nigra Macquart, Dipt. Exot. II, 3, 85, 1; Tab. X, f. 2. -- North 

 America. 



Mesaprosopus. 



Macquart, Dipt. Exot. II, 3, 83; 1843. 

 rufiventris Macquart, Dipt. Exot. II, 3, 84, 1; Tab. X, f. 1. - - Mexico. 



