388 



NORTH AMERICAN DIPTERA. 



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



Page 16S. Mr. Verrall informs nie that the real difference between 

 Neoexaireta and Actum is the ocular pubescence of the latter. He 

 also adopts the name Ciiorisops Roml. in lien of .Xeoexaireta. 



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 1S5. An examination of the type of Nothra americana Big. in 

 Mr. Verrall's cabinet discloses the tact that the species is ri^lnly 

 placed. The venation is qnite 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 l)psebins. 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 'Appcleia' read Apelleia. 



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



Page 197, et seq. Asilidse. The distinction between the Leptogas- 

 trina; 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 Leptogas- 

 /^r and Plesiomma. I am unable to make out the structure of the 

 palpi. 



Fig. [63. New genus of Asilidae between Leptogaster and Plesiomma. 



