NOTES ON DIPTERA. 113 



proof that Las Casas was the first to propose the carrying 

 negroes thither; but we have no proof that he ever sanctioned 

 it directly or indirectly. Did not he give up his own repar- 

 timiento because he felt that no Christian could hold it with a 

 clear conscience? And had he been so inconsistent after this as 

 to sanction the slave-trade, would not some one of his enemies 

 have cast this in his teeth ? Enemies he had plenty ; but it 

 remained for the man who stole most of his decades from 

 the manuscripts of Las Casas, to stand forth as his traducer. 

 May we never hear more of this charge, so falsely brought 

 against one whom we may truly call justum et tenacem pro- 

 positi virum ! 



Sudbury, July 13, 1836. 



Art. XIII. — Notes on Diptera. By Francis Walker. 



Messala. 



Messala Saundersii, Curtis, Brit. Ent. 581, is the same as 

 Bolitophila cinerea (mas), Hoff. 



Dixa. Meigen. 



D. aestivalis, Meigen. Summer and autumn; near London; 

 North Wales. 



D. aprilina, Meigen. Autumn ; near London ; North Wales. 



D. maculata, Meigen. Spring and autumn ; near London ; 

 Wales ; Devonshire ; Scotland. 



D. nebulosa, Meigen. Autumn ; near London ; Wales ; De- 

 vonshire. 



Macrocera. Meigen. 



M. phalerata, Hoffmansegg. Summer and autumn ; near 



London; Ireland. 

 M. angulata, Meigen. Summer; near London; Scotland. 

 M. centralis, Meigen. Summer; near London. 

 M. maculata, Meigen. Summer; near London. 



