SYSTEMATIC ACCOUNT. 107 



Echidtiocephaliis Lamb. 1914. Trans. Linn. Soc, 16, 351. This genus was described as 



being near Liomyza, and is accordingly to be referred to the Asteinse. 

 Hypselothyrea de Meijere. 1906. Ann. Mus. Nat. Hung., 4, 193. This genus is to be 



referred to the Asteinse. 

 Liomyza Meigen. 1838. Syst. Beschr., 7, 394. I am not familiar with this genus, but 



it appears to fit best in the Asteinse. It is surely not a drosophihne, as that group 



is here defined. 

 Microperiscelis Oldenberg. 1914. Arch. Naturgesch., 80, A, 2. Near Periscelis, and 



therefore probably to be placed in the Agromyzinae. 

 Monocera van der Wulp. 1898. Termes. Fuzetek., 21, 425. De Meijere (1914, Tijd. 



Ent., 57, 238) refers this genus to the Lauxaniinse. 

 Paratissa Coquillett. 1900. Canad. Ent., 32, 36. This genus evidently belongs in the 



Ephydrinae, where it is now usually placed. 

 Periscelis Loew. 1858. Berlin, ent. Zeit., 113, 2. Oldenberg has pointed out that this 



genus is scarcely to be considered as a Drosophihne. American specimens that I 



have examined seem to me to fit best in the Agromyzinse. 

 Sigaloessa Loew. 1865. Berl. ent. Zeit., 120. Close to Asteia, and therefore to be placed 



in the Asteinse. 

 Stenomicra Coquillett. 1900. Proc. U. S. Nat. Mus., 22, 262. The type seems to me 



to be a geomyzine, close to Mumetopia. 

 Uranucha Czerny. 1903. Wien. ent. Zeit., 22. Described as being near Liomyza, 



Is to be considered an asteine. 



XL GEOLOGICAL HISTORY. 



According to Handlirsch (1906-1908), Diptera first appear in the 

 Liassic; Cyclorrhapha not until the Lower Ohgocene. In the latter 

 period the Muscidse acalyptratse are already numerous, and are repre- 

 sented by nine subfamilies, all with species described as belonging to 

 existing genera. The Lauxaniinse, Ephydrinae, Chloropinae, and 

 Drosophilinae are among these subfamilies. The drosophihne, which 

 is the only fossil member of the group known to me from the literature, 

 is a form from Baltic amber recorded by Loew (1850) as "Drosophila 

 sp." Loew did not describe the species, and it is to be noted that later 

 (Loew, 1864) he referred to the subfamily as one "whose existence in 

 amber is tolerably well established," as distinguished from others 

 ''now known certainly to occur in amber." 



