Localities in which Pellagra is Prevalent. 33 



resulted in the capture of a larva (figure 12) belonging to 

 the genus Anopheles. It does not quite agree in structure 

 or coloration with the species known to me from Kentucky, 

 but larval characters are rather uncertain quantities, and 

 with a single example it is not worth while to attempt a 

 determination at present. Even the "combs" of teeth some- 

 times made use of in separating species, appear to be 

 variable in the same batch of larvas. 



Fig. 13.— Characteristic stalked tuft of spines from body of 

 larva of Anopheles from Horse Creek, x 376. 



The markings of the head are well represented in the 

 figure. The singular dusky tufts (figure 13) on the abdomi- 

 nal somites 3 to 7 inclusive, consist of blade-like spines 

 denticulate on the margins and mounted on a short stout 

 pedicel. Six plumose hairs ranged across the head between 

 the eyes are attached within a dusky area. Body in general 

 dull gray, with a black dorsal plate on the last abdominal 

 segment. Length 5.5 mm. 



Anopheles punctipennis. —As stated, a single engorged 

 adult of this strikingly marked species was taken on the 

 wall of my room at Pineville. It is to be recognized among 

 our species of mosquitoes by its wings, which are con- 

 spicuously marked with dusky and yellow, and by a sharply 

 defined ash-gray area along the dorsal side of the thorax. 

 These characters, together with its disposition to elevate 

 the abdomen when at rest should enable any one to recog- 

 nize it, and at the. same time distinguish it from the ob- 



