3 88 



NORTH AMERICAN DIPTERA. 



Page 167, second line, insert flagellum of before 'antenna'. 



Page 168. Mr. Verrall informs me that the real difference between 

 Neoe.vaireta and Actina is the ocular pubescence of the latter. He 

 also adopts the name Chorisops Rond. in lieu of Neoexaireta. 



Page 181, for 'Alisonia' read Akronia, and for 'Acanthina' pre- 

 oc. read Acanthinomyia Hunter. Myiochrysa coerulia is a syno- 

 nym of Sargus viridis, according to Verrall. 



Page 180, near bottom, for 'Hamatopota' read Haematopota. 



Page 185. An examination of the type of Nothra americana Big. in 

 Mr. Verrall's cabinet discloses the fact that the species is rightly 

 placed. The venation is quite like that of Pterodontia, save that there 

 is only a slight angulation in place of the costal spur. This character, 

 however, is not generic; it is disregarded in Opsebius. Mr. Verrall 

 separates the genera by the presence of but a single aristal hair in 

 Nothra, three in Pterodontia, but considering the differences used in 

 generic separation in this family I think Nothra should be suppressed, 

 Same page, for l Appeleia 1 read Apelleia. 



Page 191, couplet 3, last line, insert often after 'proboscis.' 



Page 197, et seq. Asilidae. The distinction between the L/eptogas- 

 trinae and Dasypogoninae is apparently bridged over by a new genus 

 from Brazil, represented by a specimen in my cabinet, of which a fig- 

 ure is here given. The form is quite intermediate between Leptog as- 

 ter and Plesiomma. I am unable to make out the structure of the 

 palpi. 



Fig. 163. New genus of Asilidae between Leptog aster 2&& Plesiomma 



