Sept , 1903.] LuDi.ow : Some Philii'Itne Mosquitoes. 137 



From these few observations it appears that dark moths and butter- 

 flies prefer bhie, red, black or green-colored objects on which to rest ; 

 that white butterflies are most generally attracted by white flowers ; 

 yellow butterflies by yellow flowers, while locusts decidedly i)refer to 

 rest on a white surface. 



In the case of house-flies, and perhaps Siini//ia and Culicidie, I 

 have thought that as flies evidently love heat, being thermotropic, that 

 as dark cloths absorb and retain the heat of the sun's rays better than 

 white or pale materials, they " feel better," /. c, they respond to the 

 stimulus of the warmth of a dark surface, respire more rapidly and 

 are more active ; the cause being a physical one. 



It is also evident that all these insects have good eyesight, distin- 

 guishing at a considerable distance the different colors of small objects, 

 or of more extended surfaces. 



SOME PHILIPPINE MOSQUITOES. 



By C. S. Ludlow. 



The study of the moscjuitoes in the Philippine Islands is carried on 

 by the authority of the Surgeon-General, U. S. A., and with the co- 

 operation of the Medical Department to ascertain at what places and 

 times those proven or likely to be proven disease carriers are preva- 

 lent. The work has been in progress now for about three years, the 

 collections having come in from all parts of the Islands, from Appari 

 in Luzon to Jolo in the Sulu Archipelago, and the records show that 

 besides the information gained for the medical phase of the study 

 there has also been gathered some of value only from the entomological 

 standpoint. 



Among the moscjuitoes listed below are some recently described 

 by Theobald (British Museum) as found in adjacent countries, a couple 

 of Anopheles previously published in the Journal of the New York 

 Entomological Society, and some new species, one of which Theobald 

 publishes with my permission, from my MS. in the new volume of his 

 Monograph. 



Mr. Theobald has lately created from the Anopheles the new genus 

 Myzonivia, but as I do not know the distinctive characteristics on 



