i8 5 
that the scale structure is not evident. It is so very distinct, however, that it 
can easily be identified by the characters given below. I succeeded in infecting 
four specimens of this species. 
Mr. August Busck found this species to be the commonest and most widely 
distributed one in the Zone during the season in which his collections were made, 
April-July, 1907. 
Anopheles franciscanus 
Male: Head dark brown, with short, dark, erect scales towards nape, 
emarginate and slightly forked, vertex and anterior part of occiput, with short, 
light brown scales not' forked, a tuft of light brown hairs projecting forwards 
between the eyes, a row of similar hairs projecting forwards encircling the eyes 
posteriorly; eyes deep purplish brown; antennae about two-thirds length of palpi, 
yellowish-brown hairs, basal joint dark brown; palpi equalling proboscis in 
length with emarginate scales from base to tip on under and outer surfaces, those 
upon outer surface dark, upon under surface light, long light hairs covering 
distal third, becoming short and stout at the apex, a slightly banded appearance 
at base of three distal segments; two distal joints spathulate, proboscis scaled 
except labella, labella covered with medium stout setae, a few light hairs at apex. 
Thorax: Prothoracic lobes dark; mesothorax dark brown at the sides, with 
scattered light hairs, a broad light-brown patch in the middle; within this light 
area a median line and obscure lateral lines; scutellum light with single 
horizontal row of hairs; metanotum dark without hair; halteres dark, coverec 
with thick pubescence and emarginate scales; stalks light without scales. 
4bdoraen, basal area of each segment light, covered sparingly with long, 
light hairs; two stiff hairs on posterior margin of distal segment, stout hairs on 
margin of genital lobes. 
Legs, coxae and trochanter light; trochanters, femora, tibiae, and tarsi 
covered with short, dark, emarginate scales and setae; ungues of front egs very 
unequal, the larger one with a large median tooth and a smaller basal lobe; 
middle ungues covered, with blunt basal lobes ; posterior ungues equa , simp c ; 
posterior metatarsus slightly longer than tibia. 
Wings with dark costa, with two distinct, nearly equal, yellow spots—one at 
distal end of subcostal vein, one at and involving distal end of first long vein; 
hinge dark, with a yellow spot at the end of each vein except at the end oi the 
sixth; the first spot carried on to the first long vein, the apical spot carried past 
long vein on to the upper branch of the second long vein ; the second long vein 
dark except for a few basal light scales; third long vein yellow in the middle, dark 
at the base and apex; light area at base of third long vein, carried over the fourth 
on to the upper branch of the fifth, with a few light scales at base; main brand, 
of fifth long vein light, except at base and apex; distal half of sixth long vein 
dark, except at apex, basal half light; subcostal with a light spot carried to the 
first long vein (in one specimen the light spot on sub-costal missing), ir 
vein prolonged slightly into the basal cell; first sub-marginal longer an s *§ 
narrower than second posterior cell, stem twice the length of the ce , s em o . 
posterior cell prolonged to base of wing ; supernumerary cross-vein adjacent , 
or but very shortly removed from mid cross-vein and equal to it in eng 
removed nearer to apex of wing; posterior cross-vein a lift e °^S er . 
cross-vein and varying in distance from it, from one-half to a mos wice 
length; third long'vein prolonged slightly into the basal cell, darkest scale 
costal, sub-costal and first long veins. 
Palpi of the female equalling proboscis in length, light area at°. * r ^\ 
distal segments, giving a banded appearance, clothed with sea e>, s 
