70 
MALARIA 
3. Outer clypeal hairs sparsely feathered or 
branched (5 to 10 short branches) on apical 
half; inner clypeal hairs sparsely 'feathered 
at tip .. Anopheles atropos 
Outer clypeal hairs thickly branched, the branch¬ 
ing dichotomus.4 
4. Inner clypeal hairs with sparse, minute feather¬ 
ing toward tip; hair 1 of prothorax with three 
to five strong branches from near base; 
hair 0 of abdominal segments comparatively 
large, with three to seven branches. (Speci¬ 
mens from New York State have been ob¬ 
served with these last two hairs undifferen¬ 
tiated.) . Anopheles walkeri 
Inner clypeal hairs simple (or sometimes forked 
toward tip) ; hair 1 of pro thorax short, single 
or weakly branched at tip..5 
5. Abdominal segments with two conspicuous 
tufted hairs (hairs 2 and 0) anterior to pal¬ 
mate hair; these hairs usually approximately 
equal in size and with four to nine branches 
on segments 4 and 5; lateral hairs (hair 6) 
of segments 4 and 5 usually branched at about 
basal third ... Anopheles crucians 
Anterior submedian hair (hair 0) vestigial; 
antepalmate hair (hair 2) on segments 4 and 
5, usually with no more than 3 branches.6 
6. Palmate hairs on segments 3 and 7 well de¬ 
veloped, the leaflets broad and mostly serrated 
toward tip....'..7 
Palmate hairs on segments 3 and 7 less de¬ 
veloped than those on segments 4 to 6, the 
leaflets slender and mostly nonserrated, or 
rudimentary ..... .........8 
7. Basal tubercles of inner anterior clypeal hairs 
separated by at least the diameter of one of 
the tubercles; antepalmate hairs on segments 
4 and 5 usually single; leaflets of palmate 
hairs sometimes developed on segment 2. 
Anopheles quadrimaculatus 
Basal tubercles of inner anterior clypeal hairs 
separated by less than their diameter; ante¬ 
palmate hairs on segments 4 and 5 usually 
double. . Anopheles punctipennis, 
Anopheles freehorni 
and Anopheles occidentals 
8. Five pairs of functional palmate hairs (seg¬ 
ments 3 to 7) ; antepalmate hairs an segments 
4 and 5 single or double. Gulf and Atlantic- 
Coasts. Anopheles hradleyi 
Three pairs of functional palmate hairs (seg¬ 
ments 4 to 6), those on segments 3 and 7 
rudimentary or only slightly developed; ante¬ 
palmate hairs on segments 4 and 5 three to 
five branched. Inland Georgia. 
Anopheles georgianus 
