WYEOMYIA MEGALODOKA 77 



recognize the species in Mr. Knab's Salvadorean specimens and redescribed the 

 species, creating a synonym. The reexamination of the specimens for this 

 monograph led to the discovery of the error. 



As far as we have observed, all the species of Wyeomyia with silvery pro- 

 thoracic lobes are confined to the West Indies, none occurring upon the main- 

 land, except in southern Florida, which has an essentially West Indian fauna. 



WYEOMYIA MEGALODORA Dyar & Enab. 



Wyeomyia megalodora Dyar & Knab, Proc. U. S. Nat. Mus., xxxv, 69, 1908. 

 Wyeomyia megalodora Theobald, Mon. Culic, v, 626, 1910. 



Origin Ai, Description of Wteomtia megalodora: 



Female. — Proboscis long and rather slender, swollen at the apex; occiput dark- 

 scaled, obscurely iridescent, margin of the eyes narrowly dull white-scaled; pro- 

 thoracic lobes pale violaceous, iridescent, without light scales at the apices; meso- 

 notum dark brownish-scaled, with obscure bronzy and bluish luster; abdomen 

 above blackish-scaled, with faint bronzy and bluish luster, beneath coarsely white- 

 scaled, the colors separated on the sides in a straight line; legs dark-scaled, with 

 bronzy and bluish reflections; the tarsi of the front and hind legs unmarked; the 

 middle legs, with the apical half of the second and all of the succeeding joints, 

 silvery white-marked beneath. Length, 3.5 mm. 



Two specimens, Sonsonate, Salvador, August 30, 1905. (F. Knab.) 



Type.—Ca.t. No. 11993, U. S. Nat. Mus. 



The prothoracic lobes in certain lights have a shining appearance at their apices, 

 but do not seem to be clothed with differently colored scales from those of the 

 general surfaces of the lobes. 



Description of Femaie of Wteomyia megalodora (Male and Larva Unknown) : 



Female. — Proboscis rather long, tip expanded, labellse small, rounded, with 

 fine outstanding setae; vestiture bronzy black, paler beneath. Palpi short, 

 flattened, slender, one-seventh as long as proboscis, bronzy black. Antennae 

 moderate, the joints slender, subequal, rugose, coarsely pilose, black; tori sub- 

 spherical, with a cup-shaped apical excavation, yellowish brown, with whitish 

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

 yellowish brown, pruinose. Eyes separated at vertex by a narrow wedge, bluish 

 black. Occiput clothed with flat brown scales, with a bronzy and blue reflection, 

 a dull-white margin behind the eyes joining a large silvery-white spot at lower 

 part of sides; two long setae on vertex and a row of smaller ones behind the eyes. 



Prothoracic lobes elliptical, distinctly separated, clothed with flat bronzy vio- 

 laceous scales; a row of setae on anterior margin. Mesonotum clothed vrith 

 elliptical, flat dark-brown scales, with bronzy and blue reflection; scales below 

 lateral angles and a few on anterior margin whitish ; setae over roots of wings 

 dark brown. Scutellum trilobate, with vestiture similar to and continuous with 

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

 elliptical, prominent, with low, broad median carina, dark brown, a group of 

 small setae near posterior margin. Pleurae brown, coxae luteous, clothed with 

 elliptical, flat, silvery-white scales. 



Abdomen subcylindrical, compressed, truncate apically, and with many long 

 dark-brown terminal setae ; dorsal vestiture black, with a slight bronzy and blue 

 reflection ; venter yellowish white, the colors separated at the sides in a straight 

 line, the scales raised along the mid-ventral line. 



Wings moderate, hyaline ; petiole of second marginal cell less than one-third 

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

 vein distant much less than its own length from anterior cross-vein ; scales of 

 veins ligulate, black, with a slight bronzy reflection on costa, broader and denser 

 on forks of second vein and on apical portions of third and fourth veins. 

 Halteres whitish, with black knobs. 



