44 MOSQUITOES OF NORTH AMERICA 



des Culicides et les palpes sont tres courts. Les ailes sont veinees comme celles des 

 Culex. Les tarses ne sont pas anneles de blanc. 



Description of Female, Male, and Larva of Limatus durhamii: 



Female. Proboscis very slightly swollen at tip, labellge small, rounded, with 

 outstanding setae ; vestiture black with bronzy reflection. Palpi short, one-eighth 

 as long as the proboscis, black, with many dense outstanding setae. Clypeus 

 small, rounded triangular, brown, pruinose. Antennae moderate, joints sub- 

 equal, rugose, coarsely pilose, black ; tori subspherical with a cup-shaped apical 

 excavation, brown, silvery pruinose; hairs of the whorls sparse, rather long, 

 black. Eyes rather broadly separated on the vertex, black; a quadrate luteous 

 prominence in front. Occiput small, clothed with flat black scales, with blue 

 and green iridescence ; a patch of golden-yellow ones at vertex ; a pair of coarse 

 brown bristles projecting at vertex, a row of smaller black setae at margin of 

 eyes. 



Prothoracic lobes large, prominent, well separated dorsally, densely clothed 

 with large, flat, elliptical, golden scales; a row of black setffi on apical margin. 

 Mesonotum densely clothed with elliptical, flat, brown scales with a metallic- 

 blue reflection, a large wedge-shaped dorsal patch from anterior margin and 

 a curved patch on each side before wing- insertion golden ; some scattered golden 

 scales behind. Scutellum weakly trilobate, vestiture of brown scales similar to 

 that of mesonotum, each lobe with a group of black bristles. Postnotum 

 elliptical, prominent, with a high median carina, a tuft of brown bristles pos- 

 teriorly preceded by one or two flat golden scales. Pleurae brown, coxa yellow- 

 ish, clothed with elliptical, flat, silvery-white scales in patches, a broad area 

 along upper margin of pleura golden. 



Abdomen short subcylindrical, subcompressed, the tip truncate, with many 

 terminal pale bristles ; dorsal vestiture black, with bronzy and purple reflection ; 

 venter pale yellowish-silvery or golden, forming triangular incisions on the sides 

 on the anterior parts of the segments into the black lateral color, often largest 

 on the fifth to seventh segments; first segment clothed above with flat pale- 

 golden scales and numerous pale-brown hairs. 



Wings moderate, hyaline. Petiole of second marginal cell two-fifths as long 

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

 less than its own length from anterior cross-vein. Scales of veins elliptical, 

 many obliquely subtruncate, black with a bronzy reflection, larger and denser at 

 the forks of the second vein. Halteres pale, with large blackish knobs. 



Legs moderate, slender, black with blue and bronzy reflection, femora pale 

 golden beneath, tibiae and tarsi also with golden luster below. Claw formula, 

 0.0-0.0-0.-. 



Lengtli : Body 3 mm. ; wing 3 mm. 



Male. Similar to the female. Proboscis angularly bent beyond the middle, 

 the scales in the region of the bend and at the apex dense and roughened, deep 

 black, but marked with a golden luster between the two groups of black scales. 

 Antennae with the joints slightly shorter than in the female, hairs of whorls 

 somewhat longer, ciliation coarse, sparse. Abdomen short, cylindrical, some- 

 what expanded toward the apex, with numerous coarse brown bristles at tip. 

 Hind legs silvery beneath throughout ; mid legs with the third, fourth, and fifth 

 tarsal joint silvery beneath. Claw formula, 0.0-0.0-0.-. 



Length : Body about 2 mm. ; wing 2.5 mm. 



Genitalia (plate 2, fig. 3) : Side-pieces small, stout, tapering, with fine 

 setae at tips, deeply cleft for insertion of clasp-filaments. Clasp-filament large, 

 shaft thick and uniform, bent outward at tip, ending in a point with a row of 

 short, stout hooks, continued basally by sefee ; an inner appendage of about the 

 same size as tip of filament, with an angular projection bearing a row of setae, 

 two small triangular scales at tip. Harpes stout, enlarged at base, tips divided 



