918 MOSQUITOES OF NORTH AMERICA 



Wings rather narrow, hyaline; second vein close to first; second marginal 

 cell short, much less than Jhalf the length of its petiole ; second posterior cell a 

 little longer, but also much shorter than its petiole; basal cross-vein distant 

 more than its own length from anterior cross- vein ; scales along veins small, pale 

 brownish, those of costa blackish-brown; first vein with basal third creamy- 

 white scaled ; second and third veins, both forks of fourth, and upper branch of 

 fifth with large outstanding broadly lanceolate scales. Halteres white, with 

 black knobs. 



Legs rather long and slender ; vestiture of blackish-brown scales with bronzy 

 luster, marked with white ; femora pale-scaled beneath to near apex, their apices 

 white scaled ; hind tibiae broadly white scaled at their apices ; middle tarsi with 

 last two joints and apex of third pale scaled with a metallic luster ; hind tarsi 

 with last two joints and outer half of third white-scaled. Claw formula, 

 0.0-0.0-0.0. 



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



Genitalia (plate 37, fig. 251) : Side-pieces short and stout, less than twice 

 as long as wide, tips rounded; basal lobe broad, low, setose. Clasp-filament 

 stout, swollen beyond middle, with a minute terminal claw and short hairs on 

 inner margin. False harpes small, tips pointed. False harpagones divided into 

 several portions, the inner slender one with a long curved branch below its tip, 

 the others short and recurved. 



Type : No. 12259, U. S. Nat. Mus. 



Larva, Stage IV. Head elongate, elliptical, widest through eyes, tapering 

 anteriorly, front prominently rounded, emarginate at middle; clypeal spines 

 short but stout and prominent; antennse small, with a single hair near base, 

 and a few weak spinules ; both pairs of dorsal head-hairs single and thickened ; 

 upper lateral hair short, double; lower tufts in fours; ante-antennal tufts 

 multiple. Air-tube over four times as long as wide, scarcely tapered ; pecten of 

 about fifteen rather short, broad, evenly spaced teeth, reaching nearly to middle 

 of tube, followed by a large multiple hair- tuft; single pecten-spines fringed on 

 both sides, but with the fringes longer on one side. Lateral plate of eighth 

 segment large, elliptical, with six closely set spinose comb-scales on its pos- 

 terior border. Anal segment longer than wide, ringed by the plate, which is 

 spined along its posterior border; dorsal tufts of five long hairs on each side; 

 lateral tuft small, multiple; ventral brush confined to the barred area, rather 

 sparse ; anal gills four, equal, slender, about half as long as anal segment. 



The larva was collected in a pool among rocks in a stream-bed, associated 

 with Anopheles pseudopunctipennis. Anopheles argyritarsis, Culex coronaior, 

 Culex derivator, and an Aedes, probably Aedes fluviatilis. 



Southern Mexico. 



Cordoba. Larva collected January 9; adult issued February 2, 1908 (F. 

 Knah). 



URANOTiENIA GEOMETRICA Theobald. 



Uranotwnia geometrica Theobald, Men. Culic, ii, 247, 1901. 



Uranotwnia geometrica Giles, Handb. Gnats or Mosq., 2 ed., 489, 1902. 



Uranotwnia geometrica Lutz in Bourroul, Mosq. do Brasil, 65, 1904. 



Uranotwnia geometrica Brethes, Anal. Mus. Nac. Buenos Aires, iv, 336, 1905. 



Uranotwnia geometrica Blanchard, Les Moust., 409, 1905. 



Uranotwnia geometrica Coquillett, U. S. Dept. Agr., Bur. Ent, Tech. Ser. 11, 26, 1906. 



Uranotwnia geometrica Dyar & Knab, Journ. N. Y. Ent. See, xiv, 187, 1906. 



Uranotwnia geometrica Aiken, Brit. Guiana Med. Annual, 1906, 63, 1907. 



Uranotwnia {?) geometrica Theobald, Men. Culic, iv, 565, 1907. 



Uranotwnia geometrica Autran, Anal. Dep. Nac. Hig., xiv, 30, 1907. 



Uranotwnia geometrica Busck, Snaiths. Misc. Colls., quart, iss., lii, 61, 1908. 



