92 
MAT.AWTA 
ing species, but because of tbe great varia¬ 
tions which may occur, it is less useful than 
might at first appear. The principal re¬ 
gions in which spots of definite value are 
found are the costa, the leading edge of the 
wing; the third vein; and the sixth vein. 
All the species of the subgenus Nysso- 
rhynchus have very similar wing-patterns, 
and there are great variations within the 
species, making it impossible in many in¬ 
stances to identify females by these pat¬ 
terns. In the series Anopheles, the wing- 
pattern of each species is distinctive, and 
usually will serve to distinguish species 
readily. In the Arribalzagia group, the 
pattern is very similar in most of the 
species, and other characters, such as the 
shape and color of the wing-scales, offer 
better means of separation. 
The color-markings of the palpi are also 
important characters used in distinguishing 
species. Usually the color of the last two 
segments is of some value in separating 
related species. 
In the following section, keys to the 
female adults, larvae, and male terminalia 
of the 27 species of the Anopheline species 
found in the region are given. The key to 
the female adults includes all the species 
found in the region. 
That portion of the key to the female 
adults which includes the subgenus Nysso- 
rhynchus must be used with caution, for 
the species in this subgenus resemble one 
another closely and are extremely variable 
in color-characters. This is particularly 
true of the species of the tarsimaculatus 
series, in which are the most dangerous 
vectors of malaria. 
Key to Adult Females of-Tribe Anophelini, 
Found in the Neotropical Region 
North of South America 
1. Seutellum trilobed; a medium-sized shaggy 
brown species, with dark shaggy palpi; 
mesonotum with erect black scales before 
wing-bases; wings heavily clothed with 
broad ovate scales, mixed dark and light, 
not forming definite spots; second to fifth 
hind tarsal segments broadly white basally, 
black apically, with a narrow black ring near 
base of each segment (Atlantic coast of 
Costa Rica and Panama) (Genus chagasia) 
bathanus 
Seutellum not trilobed, crescent-shaped; meso¬ 
notum without erect scales before wing- 
bases; legs not marked as above..2 
2. Slender black species, without scales on body; 
mesonotum dark brown, with a narrow 
white median line in integument; wing- 
scales all black; legs very long and slender, 
all black (Atlantic eoast of Costa Rica, and 
Panama) (Subgenus stethomyia) .kompi 
Body with scales, at least on anterior promon¬ 
tory of thorax; mesonotum without median 
white line .............3 
3. Hind tarsi all dark.4 
Hind tarsi with some or all of the terminal 
segments white; or variously spotted, speck¬ 
led or banded with white.12 
4. Scales on wings all dark; thorax without med¬ 
ian gray stripe . 5 
Scales forming wing-markings white and 
black; thorax with broad median gray 
stripe . 6 
5. Wings very dark, the scales aggregated into 
four indistinct patches on origin of second 
vein, on cross-veins, and at bases of forks of 
2nd and 4th veins; palpi with white rings 
at bases of terminal segments (rarely ab¬ 
sent) (southwest Cuba) . apropos 
Wings lighter, the scales forming four distinct 
darker spots on origin of second vein, on 
cross-veins, and at bases of forks of 2nd and 
4th veins; palpi without white rings LJJS 
MACULIPENNIS 
QUADRIMACULATUS 
6. Hind tibia with broad white apical band; 
wing-scales dark, except for a small white 
spot at basal third of first vein, and one 
large and one small white spot at apex of 
wing (Panama to Mexico) . eiseni 
Hind tibia all dark; white wing-spots not as 
above . ..........7 
7. Hind femur with narrow white apical band; 
wing-scales dark, except for white areas at 
apex of wing on tip of costa and on tip of 
first vein; wing-fringe white at this point 
(Guatemala) . xelajuensis 
Hind femur and all other segments of leg 
dark; wings with many areas of black and 
white seales . 8 
8. Palpi all dark, without white rings; a broad 
white spot on costa, also involving first vein 
and base of second vein; another at tip of 
first vein, remainder of costa dark; sixth 
vein dark at both ends, white in middle 
(Mexico) . PUNCTIPENNIS 
Palpi with white rings on some of the seg¬ 
ments; wings variously marked, but sixth 
vein not as above ....s.J 
9. Palpi marked with white on terminal segment 
and on two preceding segments; costa of 
