The following is a list of Anophelines of the Canal Zone : — 
Ce/lia argyrotnrsis, R.D. 
Cellia tarsimaeu lata , Goeldi 
Cellia (?) gorgasi, D.K. 
Cellia albimana, Wietl. 
Anopheles (?) crusii, D.K. 
Anopheles (?) apicitnacula , D.K. 
Anopheles (?) punctimaculata , D.K. 
Arribalsagia (?) malefactor, D.K. 
Anopheles (?) eiseni, Coquill 
Anopheles francisanus, McCrack 
Anopheles pseudopunctipennis, Tbeob. 
The above eleven species of Anophelines have been collected in 
the Canal Zone during the past five years. I hey are not taken, nor 
do they exist in their breeding places, in anything like equal numbers. 
For example: Only one specimen of Ce. (?) gorgasi has been 
found. Of the eleven species, the commonest ones are Ce. albimana 
A. pseudopunctipennis and Arr. ( ?) malefactor , but this again must 
be qualified by stating that the predominance of a species varies from 
season to season and from place to place. In certain villages, upon 
going through the barracks only Ce. albimana will be found, while 
in other villages, from five to ten per cent, of the mosquitos will be 
A. pseudopunctipennis , and at Ancon during October, 190b, 27 per 
cent, were A. malefactor and 72 per cent. Ce. albimana. Mr. A. 
Busck, of the Bureau of Entomology, United States Department of 
Agriculture, who collected and made observations on Zone 
mosquitos during 1907, gave it as his opinion that A. pseudopuncli 
pennis was the commonest Anopheline during the period of his stay. 
The necessities of the canal operations in excavating and filling, 
change the topography of districts and localities so as sometimes to 
convert salt marshes into fresh water ponds, or to make tracts of land 
containing few Anophelines, into a vast swamp in which they 
luxuriate. On the other hand, swamps and breeding places may be 
drained or filled in the work of excavation. I hese factors, among 
others, influence the number and variety of species in a locality. 
Hie commoner Anophelines of the Canal Zone nia\ be div 1 
into three groups : — 
