WYEOMYIA VIOLESCENS 79 



Legs rather long and slender, black, with a bronzy reflection, the femora 

 whitish beneath ; tibia? and tarsi with a bronzy luster beneath ; middle legs 

 with tip of second and all of third and fourth joints silvery white beneath. Claw 

 formula, 0.0-0.0-0.0. 



Length : Body about 3.5 mm. ; wing 3.2 mm. 



Male. Proboscis as in the female. Palpi minute. Antennae similar to those 

 of the female ; hairs of whorls longer and more abundant. Coloration as in the 

 female. Wings slightly narrower, vestiture sparser, basal cross-vein about its 

 own length from anterior cross-veins. Legs marked as in the female, the white 

 on mid tarsi situated on outer side, the bronzy luster beneath strong. Claw 

 formula, 0.0-0.0-0.0. 



Length : Body about 3 mm. ; wing 2.5 mm. 



Genitalia (plate 4, fig. 19) : Side-pieces long, about three times as long as 

 wide, the tips sharply conical ; a conical lobe at iDasal third within covered with 

 fine hairs. Clasp-filament with a slender stem, constricted slightly at its apical 

 third and an expanded terminal portion, which is rounded quadrate, setose, 

 inner edge revolute, v/ith a row of hooked spines and a small, elliptical, bent 

 prominence, the outer edge thickened and revolute. Harpes slender, with a pair 

 of appendages at tip. Unci broad and short. 



Larva. Our specimen is too much broken to be described. Only a part of the 

 head remains. 



Mr. Busck found the larvae in water in the leaf -sheaths of a terrestrial brome- 

 liad, resembling a century-plant, growing on the pitch lake at La Brea, Trini- 

 dad, associated with Culex imitator. 



Trinidad, British West Indies. 



La Brea, bred from larvae, July 8, 1905 (A. Busck). 



WYEOMYIA VIOLESCENS Dyar & ICnab. 



Wyeom.yia smithii Pazos (not Coquillett), Bull. Soc. ent. de France, 135, 1904. 

 Wyeomyia violescens Dyar & Knab, Proc. Biol. Soc. Wash., xix, 138, 1906. 

 Wieomyia violescens Pazos, San. y Ben., ii, 51, 679, 1909. 

 Wyeomyia violescens Theobald, Mon. Culic, v, 623, 1910. 



Original Description of Wyeomyia violescens: 



Head black, a silvery spot on vertex; proboscis black; prothoracic lobes pearly 

 violet; thorax bronzy brown, scales towards the margin more metallic; pleurae and 

 coxae silvery; abdomen black with bluish reflection, silvery beneath; legs blackish, 

 femora and tibiae pale beneath, middle pair with part of third, fourth and fifth 

 tarsal joints pale above; hind pair with the tarsi laterally white at the bases of the 

 joints. 



8 specimens, Cayamas, Cuba, May and June (E. A. Schwarz). 



Type. Cat. No. 9991, U. S. Nat. Mus. 



Description of Female of Wyeomyia violescens (Male and Larva Unknown) : 



Female. Proboscis rather long, distinctly swollen apically, vestiture black, 

 with a bronzy and blue reflection ; labellns small, rounded, with fine outstanding 

 setae. Palpi short, flattened, one-seventh as long as proboscis, bronzy black. 

 Antennge moderate, the Joints slender, subequal, rugose, coarsely pilose, black ; 

 tori subspherical, with a cup-shaped apical excavation, luteous, with a slight 

 pruinosity ; hairs of whorls long, rather sparse, black. Clypeus rounded, convex, 

 brown, pruinose. Eyes separated at the vertex by a broad wedge produced 

 anteriorly into a blunt point, bluish black. Occiput clothed with flat brown 

 scales, with a metallic reflection, a small silvery-white spot at vertex, a white 

 patch below, produced upward a distance along margins of eyes; two long setae 

 at vertex and shorter ones along margins of eyes. 



Prothoracic lobes large, elliptical, distinctly separated, clothed with flat, pale, 

 shining violaceous scales; a row of setae anteriorly. Mesonotum clothed with 



