14 ENTOMOLOGICAL NEWS. [Jan., '17 



Figs. 40-41. Ccrtion lindenii (Selys). From male in coll. of E. B. 



Williamson. "K. J. Morton coll., May I, 1912." 

 Fig. 42. Ccrcion quadrigcrum (Selys). From male in coll. of Dr. 



P. P. Calvert. Only datum is "Japan." 

 Fig. 43. Ccrcion sp. From male in coll. of Dr. P. P. Calvert. 



"Japan, Chic. Exhib. No. 1397." 

 Figs. 44-45. Ccrcion (?) sp. From male, with damaged abdominal 



appendages, in coll. of Dr. P. P. Calvert. "Madagascar. From 



Rene Martin." 

 Figs. 46-47. Cocnagrion angulattim Walker. From a male in coll. of 



E. B. Williamson. Coll. and det. by Dr. E. M. Walker. 

 Figs. 48-49. Cocnagrion cacrnlesccns (Fonsc.). From male in coll. of 



E. B. Williamson. "From K. J. Morton. Sebdon, Algeria, June 



23, 1904." 



_. . 



A Simple Method of Identifying the Anopheles Mos- 

 quitoes of the Canal Zone (Dip.).* 



By L. H. DUNN, Entomologist, Board of Health Laboratory, 

 Ancon, Panama Canal Zone. 



The purpose of this article is to endeavor to supply a long- 

 felt want and present a simple method of identifying the more 

 common types of Anopheles mosquitoes found in the Canal 

 Zone, and it is to be hoped that it may prove to be useful to 

 those for whom it is intended, sanitary inspectors, medical 

 men, and others interested in sanitary work. 



The anti-malarial work on the Canal Zone is of sufficient 

 importance to make it necessary that all those engaged in 

 sanitary work should be able to identify the Anopheles com- 

 monly encountered, and especially should be able to differen- 

 tiate those that are known to be malarial carriers from those 

 that are not. 



Each species of the Zone Anopheles has some characteristic 

 markings peculiar to itself that make it easy to identify when 

 they are once known, and provided the specimens are not too 

 badly mutilated. Mosquitoes that have been in flight for some 

 time before capture, or have been bred out from larvae and 

 left in a breeding jar for several days before an attempt at 



*Read before The Medical Association of the Isthmian Canal Zone, 

 September 16, 1916. 



