82 MISC. PUBLICATION 336, U. S. DEPT. OF AGRICULTURE 
9. Anal segment with usual median ventral brush, consisting of a close-set 
row of tufts; air tube with one pair of hair tufts, attached before 
middle, each with several long hairs. [Comb with one row of short 
seales and a second row of very long, pointed scales; antenna with a 
tuft of about four long hairs, attached before middle; head hairs all 
multiple; lateral hairs on abdominal segments 8 to 6 long and single; 
air tube 3 or 4:1.] ‘Tree-hole breeders______________ Orthopodomyia 
Anal segment without a median ventral brush, but with a pair of 
ventrolateral tufts (fig. 24, C); air tube with scattered hairs or small 
tufts. [Comb scales in a single row; antenna with a Single or double 
hair beyond middle.] Breed in water-holding plants______ Wyeomyia 
ANOPHELES 
10. Abdomen with plumose lateral hairs on first three segments only; head 
with large: plumose fromballnaics = (hie) 22) eee ea 
Abdomen with plumose lateral hairs on first six segments _ (the branches 
sparse) ; frontal head hairs minute, single. [Palmate hairs well de- 
veloped on segments 2 to 7%7.] A tree-hole breeder________ A. barberi 
11. Outer =clypeal hair pranched see ee 
All clypeal hairs simple, the inner pair well separated. [Palmate 
hairs developed on segments 8 to 7, the leaflets ending in long, slender 
filaments; postspiracular plate sometimes with a slender tail on each 
ro) el eee ei ier ie api ieee Nee | NE ee A. pseudopunctipennis 
12. Outer clypeal hairs sparsely feathered or branched (5 to 10 short 
branches) on apical half. [Inner clypeal hairs forked or sparsely 
feachereds cataetlps =.= Pee ete eee 
Outer clypeal hairs thickly branched, ‘the branching dichotomous ese ee 
13. Inner clypeal hairs closely approximated; lateral hairs on abdominal 
segments 4 and 5 branched, usually in threes; palmate hairs well 
developed on segments 4 to 7 and partially developed on segment 3, 
the leaflets with notched or serrated edges toward tip__.__ A. atropos 
Inner clypeal hairs widely separated (by about one-third the distance 
between the outer clypeal hairs) ; lateral hairs on segments 4 and 5 
simple; palmate hairs developed on segments 1 to 7, sometimes a 
pair on the metathorax also; leaflets long and slender, with smooth 
TUNERS TN Si ea ee eS A. albimanus 
14. Abdominal segments with but one conspicuous hair anterior to palmate 
hair, this hair (the antepalmate hair, or hair 2) usually single or 
double, but sometimes with three to six branches, on segments 4 and 
5; hair 0 undeveloped or very much smaller than hair 2__-__-_______ 
Abdominal segments with two conspicuous tufted hairs (hairs 2 and 0) 
anterior to palmate hair; these hairs usually approximately equal in 
size and with four to nine branches on segments 4 and 5. [Lateral 
hairs of segments 4 and 5 usually branched at about basal third; 
palmate hairs developed on segments 3 to 7.]_--__--__-__ A. crucians 
15. Basal tubercles of inner anterior clypeal hairs separated by more than 
the ‘diameter:.of*one:-tubercles==_ es) se ee ee 
Basal tubercles of inner anterior clypeal hairs separated by less than 
their diameter; occipital hairs usually with not more than five 
Dranches=222e5s sar Me eee me 
16. Occipital hairs usually with 8 to 10 branches; “palmate hairs on seg- 
ment 3 developed about equally as those on segment 4, and palmate 
hairs on segment 2 frequently partially developed and functional. 
[Antepalmate hairs of segments 4 and 5 mostly single; antennal hair 
tuft usually attached near middle, the hairs reaching base of apical 
SPUN ls he oe aa ee eS es ee A. quadrimaculatus 
Occipital hairs with 2 to 5 branches; palmate hairs less developed on 
segment 3 than on segment 4 and rudimentary on segment 2; see also 
couplet’ 19222 2 on ee ee eee A. bradleyi 
17. Inner anterior clypeal hairs simple (rarely forked toward tip); hair 
1 of prothorax short, single or weakly branched at tip; palmate hairs 
rudimentary on segments 1 and 2___________-_ Fe Soe 
Inner clypeal hairs with sparse, minute feathering toward tips hair 
of prothorax with three to five strong branches from near base. [Hair 
0 on abdominal segments comparatively large, with three to seven 
22 
62 
11 
13 
14 
15 
16 
17 
18 
