Vol. XXVlii] ENTOMOLOGICAL NEWS. 15 



identification is made, are often broken and rubbed sufficiently 

 to remove many of the scales, and to lose some of the color 

 markings that help to simplify identification, and are more dif- 

 ficult to identify. 



As far as I have been able to ascertain eleven species of 

 Anopheles have been found in the Canal Zone up to the pres- 

 ent time. Seven of these species are commonly found in this 

 region. The remaining four species are seldom encountered. 

 The seven common kinds are placed in the following list 

 according to their abundance on the Canal Zone at the pres- 

 ent time : Anopheles albunanns Wiedemann, tarsi metadata 

 Goeldi, pseudopunctipennis Theobald, malefactor Dyar & 

 Knab, arg \riiar sis Desvoidy, apiciinacnla Dyar & Knab, ciseni 

 Coquillett. 



The four species not commonly found are: Anopheles gor- 

 gasi Dyar & Knab, critz'n Dyar & Knab, punctimacula Dyar & 

 Knab, f rands c anus McCracken. 



Seasonal changes exert an influence on the abundance of 

 the different species and the relative numbers of the Ano- 

 pheles at certain periods of the year may not conform with 

 this list, but it has been taken from the average for the whole 

 year, from both the larvae received at the Laboratory for 

 identification, and from the hand catches of adults in quarters 

 that are sent in daily, from all towns and army posts in the 

 Zone, to be identified. For example, A. eiseni that nearly al- 

 ways breeds in tree-holes and hollows in rocks and other 

 places of like nature, is few in numbers even during the 

 middle of the rainy season, but may not be found even in what 

 seem to be its favorite localities even after a long search dur- 

 ing the latter part of a dry season when very little rain has 

 fallen and its habitual breeding places are dried up. 



I have attempted to construct the following table in such a 

 manner that it provides a simple method for determining the 

 adult Anopheles found in the Canal Zone, and as far as pos- 

 sible have avoided all entomological nomenclature so that it 

 may be readily understood by those who are not .familiar with 

 the anatomy of mosquitoes. 



