130 Psyche [December 



strongly punctate. Head emarginate in front and consequently 

 very thin anteroposteriorly. Antennae brown-black, hairy. Legs 

 brown, trochanters, tips of tibiae and tarsi pale or whitish. Wings 

 hyaline, fringed with long hairs, forewings with a brown band ex- 

 tending across the stigmal region and another at the apical margin." 



FIRST ACCOUNT OF A THERMOTROPISM IN ANOPHELES 

 PUNCT/PENNIS, WITH BIONOMIC OBSERVATIONS. 



By Werner March and. 



Department of Animal Pathology, Rockefeller Institute for 



Medical Research, Princeton, N. J. 



In the fall of 1915, while taking part in a survey of the breeding- 

 places of Anopheline mosquitoes in the neighborhood of Princeton, 

 in cooperation with the local Mosquito Extermination Commission, 

 the writer made certain observations on the mosquitqes encount- 

 ered. This accovmt is restricted to a few facts which appear to be 

 new or serve to clear up some doubtful point in the life history of 

 the mosquitoes.^ 



I. Bionomics of the Larvae . 



In the Princeton region, only two species of Anopheles have been 

 recorded, these being A. quadrimamdatus and A. piinctipennis. 

 The latter species is by far the more common, but, since King's 

 experiments (1916),^ it cannot be regarded as entirely harmless. 

 It is doubtful, however, whether this species, which has been found 

 to occur as far north as Boston, Mass. (Th. Smith) ,^ is also in the 

 northern states a regular carrier of malaria. 



The larvae of A. pwictipennis were kept captive in large numbers 

 and lived best in a flat dish which was left uncovered in order to 

 give free access to the air. In a dish about eight inches in diam- 



1 The writer wishes, on this occasion, to express his thanks for the kind helpfulness through 

 which his work was facilitated by Professor E. G. Conklin and Professor Ulric Dahlgren of 

 Princeton University. Dr. Conklin also had the kindness to revise the English of the MS. 



2 King, W. v. Experiments on the development of malaria parasites in three American 

 species of Anopheles, Jour. Exp. Med., Vol. 23, pp. 703-716, 1916. 



'Theobald Smith. Notes on the Occurrence of Anopheles punctipennis and Anopheles 

 quadrimaculatus in the Boston suburbs. Jour. Bost. Society of Medical Sciences, Vol. V, pp. 

 321-324, 1901. 



