720 MOSQUITOES OF NOETH AMERICA 



(J. — Palpi slightly shorter than the proboscis, hairy on the apical portion, the two 

 apical segments light ringed at their bases; abdomen with distinct basal white 

 bands on the second to fourth segments, on the succeeding segments broken into 

 three spots, the median spot becoming elongate on the sixth and seventh segments, 

 lateral cilia abundant, pale. Length, 4 mm. 



Five specimens, Chagres River, Panama (August Busck, collector), bred from 

 larvae in pot-holes along the river. 



Type. — No. 10868, U. S. National Museum. 



Apparently nearly allied to Danielsia tripunctata Theobald and to Danielaia 

 mediomaculata Theobald, the abdominal marking differing from the former and the 

 thoracic marking differing from the latter. We would place Danielsia Theobald as 

 a synonym of Aedes in our classification. 



Desceiption of Veumse, Male, and Labva of Aedes fluviatilis : 



Female. — Proboscis rather long and slender, uniform, the labellae conically 

 tapered ; vestitnre black ; setae minute, curved, black, those on the labellae more 

 prominently outstanding. Palpi one-fifth as long as the proboscis, black scaled. 

 Antennae moderate, the joints subequal, rugose, pilose, black, second joint 

 slightly enlarged, yellowish; hairs of whorls short, sparse, black; tori sub- 

 spherical, with a cup-shaped apical excavation, luteous, a patch of small white 

 scales on inner side. Clypeus rounded triangular, elongate, dark brown, nude. 

 Occiput broadly clothed with narrow, curved, dull creamy somewhat lustrous 

 scales and some erect forked ones on the nape of the same color, a few black 

 erect forked scales laterally; sides and cheeks clothed with fiat creamy scales 

 enclosing a large diffuse patch of darker ones; bristles along margias of eyes 

 black, those projecting between the eyes pale yellow. 



Prothoracic lobes elliptical, remote dorsally, clothed with pale scales and 

 black bristles. Mesonotum dark brown, clothed with narrow, curved, straw-col- 

 ored scales with silvery luster over anterior two-thirds and containing two small 

 wedge-shaped brown stripes anteriorly, posterior third deep bronzy brown, more 

 or less distinctly divided into patches by four lines of pale scales, the two larger 

 patches on the sides reach to roots of wings ; antescutellar space surrounded by 

 pale scales. Scutellum trilobate, clothed with narrow curved pale scales, each 

 lobe with a group of brown bristles. Postnotum elliptical, prominent, dark 

 brown, nude. Pleurae and coxae brown, clothed with elliptical, flat white scales 

 and a few pale bristles; prothoracic epimera clothed with bronzy brown scales 

 like those on mesonotum. 



Abdomen subcylindrical, depressed, tapering towards tip; dorsal vestiture of 

 black scales with violet and bronzy reflection, each segment with a narrow 

 median elongate patch of whitish scales, the patches forming a median stripe, 

 broken at apices of segments, the spots on last two segments nearly continuous ; 

 also more or less distinct basal segmental pale bands, sometimes wanting, 

 generally joined to a series of large, pure white, lateral patches ; venter yellowi^ 

 white scaled. 



Wings moderate, hyaline; petiole of second marginal cell about one-half as 

 long as its cell, that of second posterior cell shorter tiian its cell ; basal cross-vein 

 distant about its own length from anterior cross-vein ; scales of veins blackish 

 brown, the outstanding ones broadly linear, long. Halteres whitish, with black 

 knobs. 



Legs moderate, rather slender; vestiture brownish black; front and middle 

 femora broadly whitish beneath basally, hind femora wholly pale on basal half ; 

 knees whitish ; hind tarsi with narrow white rings at bases of all the joints ; first 

 joint narrowly white marked at apex ; two last joints of fore tarsi and last of 

 mid tarsi not ringed. Claw formula, 1.1-1.1-0.0. 



Length : Body about 4 mm. ; wing 3.5 mm. 



Male. — Proboscis moderately long, straight. Palpi three-fourths as long as 

 the proboscis ; apex of long joint and last two joints slightly swollen and bearing 

 many long, coarse, black hairs ; vestiture bronzy-black with a few whitish scales 



