130 Psyche [December 
strongly punctate. Head emarginate in front and consequently 
very thin anteroposteriorly. Antenne brown-black, hairy. Legs 
brown, trochanters, tips of tibiz 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 OFA THERMOTROPISM IN ANOPHELES 
PUNCTIPENNIS, WITH BIONOMIC OBSERVATIONS. 
By WERNER MarcHAND. 
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 codperation with the local Mosquito Extermination Commission, 
the writer made certain observations on the mosquitoes encount- 
ered. This account 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 Larve. 
In the Princeton region, only two species of Anopheles have been 
recorded, these being A. quadrimaculatus and A. punctipennis. 
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 larve of A. punctipennis 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. 
2King, W. V. Experiments on the development of malaria parasites in three American 
species of Anopheles. Jour. Exp. Med., Vol. 23, pp. 703-716, 1916. 
3 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. 
