1914] Smith—The Development of Anopheles punctipennis Say is 
Aug. 1—palmate hairs not started, respiratory siphon well 
developed 1 P. M. 
1—palmate hairs not visible yet, 10 P. M. 
3—palmate hairs visible, eyes distinctly double, 
collar wider, head narrower. 
6—molted for the 3d time, 15 days, 2 Pp. M. 
D. July 23—1.6 mm., had molted once, about 4 days old. 
30—4.5 mm., stellar hairs have appeared, 11-12 days. 
31—4.6 mm., 13th day (Appr.) 8 ep. M. Just molted 
for 3d time; eyes double, palmate hairs; trans- 
parent areas of abdomen for first time. 
Full-grown Larva (fig. 7). There is a period of about nine days 
between the third molting and the transformation to the pupa, 
during which there are few changes in appearance. The head 
usually grows darker, although in many specimens it never be- 
comes really dark. The adult eyes show greater development of 
the ommatidia and the coming rounded eyes of the adult are being 
revealed. The ‘collar’? becomes wider with age, and the thorax 
assumes a decidedly round appearance. Often the whole body is 
green, or an even brown, or with a white stripe, or spotted along 
the mid-dorsal line. These differences in color do not appear in 
the younger forms. Dr. Howard proved that in the case of A. 
maculipennis young larve fed on alge will turn green. 
The conspicuous structures of this last stage of the larva are 
the five pairs of palmate hairs of the abdomen, the transparent 
areas between the abdominal segments, and the little two-lobed 
projections of the prothorax, which are indications of the develop- 
ing respiratory siphons of the pupa. 
When not in use, the palmate hairs are folded against the body. 
They have been clearly described by Nuttall and Shipley (1900) 
for A.maculipennis. Like all the other forms of hairs of the larva’s 
body, they are wonderfully fitted to their work of holding to the 
underside of the surface film. They are not found on the first 
and second segments of the abdomen. On about the last day 
before the change to the pupa, there suddenly appears on the 
first segment of the abdomen a large tuft of branched hairs, a 
certain indication of approaching pupation (fig. 7). 
The transparent areas of the segments of the abdomen are like 
