1016 MOSQUITOES OP NORTH AMERICA 



that the scale structure is not evident. It is so very distinct, however, that it can 

 easily be identified by the characters given above. 



Obiqinai. Descbiption of Anopheles fbanciscanus : 



Male. — Head dark brown, with short, dark, erect scales toward the nape, emargi- 

 nate and slightly forked, vertex and anterior part of occiput with short, light brown 

 scales not forked, a tuft of light brown hairs projecting forward between the eyes, 

 a row of similar hairs projecting forward, 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 light area at base of three distal segments, giving a slightly 

 banded appearance; two distal joints spatulate, proboscis scaled except labella, 

 labella covered with medium stout setae, a few light hairs at apex. 



Thorax; prothorax 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 hairs; hal teres dark, covered with thick 

 pubescence and emarginate scales; stalks light without scales. 



Abdomen, 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, coxa and trochanter light; trochanters, femora, tibiae and tarsi covered 

 with short, dark, emarginate scales and setae; ungues of front legs very unequal, 

 the larger one with a large median tooth and a smaller basal lobe; middle ungues 

 curved, with blunt basal lobes; posterior ungues equal, simple; posterior metatarsus 

 slightly longer than tibia. 



Wings with dark costa, with two distinct, nearly equal, yellow spots — one at 

 distal end of sub-costal vein, one at and involving distal end of first long vein; 

 fringe dark, with a yellow spot at the end of each vein except at the end of the 

 sixth; the first spot carried on to the first long vein, the apical spot carried past 

 over 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 

 branch of fifth long vein light, except at base and apex; distal half of sixth long 

 vein dark, except at apex, basal half light; sub-costal with a light spot carried to the 

 first long vein; (in one specimen the light spot on sub-costal missing); third long 

 vein prolonged slightly into the basal cell; first sub-marginal cell longer and 

 slightly narrower than second posterior cell, stem twice the length of the cell; stem 

 of second posterior cell prolonged to base of wing; supernumerary cross vein 

 adjacent to or but very shortly removed from mid cross-vein and equal to it in 

 length when removed nearer to apex of wing; posterior cross-vein a little longer 

 than mid cross-vein and varying in distance from it from one-half to almost twice 

 its own length; third long vein prolonged slightly into the basal cell, darkest 

 scales on costal, sub-costal and first long veins. 



Palpi of the female equalling proboscis in length, light area at base of three 

 distal segments, giving a banded appearance, clothed with scales, short hairs and 

 setae as in male, distal joints not spatulate; legs with the ungues equal; otherwise 

 agreeing with the male. 



Oeiginai, Descbiption op Anopheles pebuvianus: 



Oabeza. — de color general negro, salvo en las regiones post-ocular 6 inter-ocular; 

 cubierta de pelos blancos y escamas en tornillo y en hoz, que entre los ojos fornan 

 un haz espeso de elementos proyectados hacia adelante. Los hordes posteriores de 

 los ojos, hacia las partes laterales, estS,n ornados de pelos negros y una multiple 

 serie de escamas en tornillo y en hoz de color pardo muy oscuro. 



Ojos negros. 



Antenas claras, de color pardo, amarillentas en ciertas incidencias de la luz, muy 

 finas, con sedas y pelos negros. Los prlmeros artlculos son menos oscuros que los 

 tiltimos, cuya coloracidn es casi negra. Pieza de implantaci6n ligeramente mas 

 oscura que el primer artlculo, ornada de varias escamas amarillentas, en raqueta. 



Palpas muy oscuras, casi negras, un poco m&s cortas que la trompa, con cuatro 

 artfculos, subpenicllares, el tiltimo de los cuales adelgazado y de color bianco amari- 

 llento. Est&.n en su totalidad cubiertos de escamas flliformes, negras, mucho mfis 

 marcadas en los artlculos proximales. Las extremidades apicales de los apSndices 

 son ligeramente m&s claras que el resto, y en el illtimo, la zona Clara ocupa m&s la 

 mltad del artlculo. 



Trompa casi negra; la oliva terminal de color ligeramente amarillento, cubierta 

 de pelos cortos negros. Longitud, 2 mm. 3. 



