JOURNAL 



J}t\a JBork 6!nkraoIogirHl Horiptg. 



V^ol. X. SEPTEMBER, 1902. No. 3. 



TWO PHILIPPINE MOSQUITOES. 



By C. S. Ludlow. 



Among the new undertakings begun in the Philippines under the 

 shelter of the Army, is the study of some of the insects connected with 

 the transmission of diseases, especially of mosquitoes ; and in the 

 little while that this work has been under way interesting points have 

 developed in connection with what may be called " insular variation." 



This, so far as has been observed, usually occurs so as to throw the 

 new variety between two established species, and, in many cases, is 

 so marked as to raise a question as to identity of species, or even 

 where the species may be granted, is enough to prove very trying in 

 classifying these insects. For instance, what in other respects is 

 Anopheles rossii Giles has " curiously mottled " legs, not described for 

 the type, but resembling those of ^. costalis Loew. What should be 

 A. annularis van der Wulp, which Theobald places as a subspecies 

 under ^. sinensis Wied., evidently stands between that and his sub- 

 species pseudopiciiis Grassi, for while it agrees to the former in most 

 points, it agrees with pseudopiciiis in having three joints of the palpi 

 banded white and the tip white, in having the third small light spot 

 on the subcosta (besides the two on the costa), and in the thoracic 

 lines, there being no spots or change of color between the scales of the 

 cephalic and caudal end of the thorax as in annularis ; while it differs 

 from either in having no apical light band on the third tarsal joint of 

 the hind legs. Such differences point, of course, toward breaking 

 down these subspecies, and seem to make it desirable to keep all at 

 one very variable form, with certainly nothing more definite than 

 varieties under it. 



