FAUNA OF PENIKESE ISLAND. 31 



certainty. I should judge that there are about 30 additional 

 species in the material, including the most conspicuous Dipteran 

 encountered on the island, the mosquito, which apparently 

 belongs in the genus Aedes, but which I have not included 

 because the species remains very uncertain. 



"There is one record that seems never to have been published 

 as American, though the insect is so common that I suspect 

 several people must have identified it correctly before I have 

 myself had the necessary information for two years now. One or 

 two of the other records are of some interest from the point of 

 view of geographical distribution, and that of Muscina pascuorum 

 is apparently the only one for 1923 as early as August. Since 

 the species appears to have been introduced from Europe only 

 within the past few years any such data about it are of value, I 

 think." 



Asilidae. 



Asilus paropns Walker (Determined by C. W. Johnson). 



Dolichopodidae. 



Dolichopus albicoxa Aldrich. 



D. bijractus Loew. 



D. pugil Loew. 



D. splendidus Loew. 



Lonchopteridae. 



Lonchoptera jurcata Fallen. 



Syrphidae. 



Allograpta obliqua Say. 

 Eristalis tenax Linne. 1 

 Helophilus Icetus Loew. 

 Platychirus quadrat us Say. 

 Toxomerus marginatus Say. 



Muscina3. 



Muscina pascuorum Meigen. 



Stomoxyinse. 



Stomoxys calcitrans Linne. 



Calliphorinse. 



Calliphora erythrocephala Meigen. 



1 Larvae of this, or a very similar species were very common in samples of mud 

 taken from the bottom of freshwater ponds. R. E. C. 



