WYEOMYIA CHALCOCEPHALA 145 



WYEOMYIA CHALCOCEPHALA Dyar & Knab. 



Wyeomyia ohalcocepJiala Dyar & Knab, Proc. Biol. Soc. Wash., xlx, 140, 1906. 

 Wyeomyia chalcocephala Theobald, Mon. Culic, v. 624, 1910. 



Original Desceiption of Wyeomyia chalcocefhaia: 



Prothoracic lobes entirely dark; head bronzy behind, the eyes with a white margin 

 that is narrowed centrally. 



7 specimens, Trece Aguas, Alta Vera Paz, Guatemala (Schwarz and Barber), and 

 others, presumably the same, but badly denuded of scales, from Aguna, Guatemala 

 (D. G. Eisen) and Bocas del Toro, Panama (P. Osterhout). 



Type.— Cat. No. 10,002, U. S. Nat. Mus. 



Descbiption or Femai.e, Male, and Labta of Wyeomyia chalcocephala: 



Female. — Proboscis rather short, swollen apieally, vestiture black, with a 

 bronzy and blue reflection, a paler luster beneath ; labellae small, rounded, with 

 fine outstanding setae. Palpi short, flattened, one-fifth as long as proboscis, 

 bronzy black. Antennae moderate, the joints slender, subequal, rugose, coarsely 

 pilose, black; tori subspherical, with a cup-shaped apical excavation, dark 

 brown, with whitish pruinosity; hairs of whorls long, rather sparse, black. 

 Clypeus rounded, convex, blackish brown, pruinose. Eyes separated at the 

 vertex by a narrow wedge, bluish black. Occiput clothed with flat brown scales 

 with a metallic reflection, a small ill-defined metallic spot at the vertex, a white 

 patch below ; a faint white border along the eyes below, not reaching the vertex ; 

 two long setffi at vertex and short ones along margin of eyes. 



Prothoracic lobes elliptical, well separated, clothed with flat scales, black 

 with a submetallic reflection ; a silvery patch at base. Mesonotum clothed with 

 elliptical, flat dark-brown scales with a bronzy and blue reflection ; scales on an- 

 terior margin whitish, those below lateral angles silvery; bristles 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. Post- 

 notum elliptical, prominent, a faint median carina, dark brown, a group of small 

 setffi near the posterior margin. Pleurae and coxae luteous, clothed with ellip- 

 tical, flat silvery-white scales. 



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

 dark-brown terminal setae ; dorsal vestiture black, with a slight metallic reflec- 

 tion ; venter yellowish white, colors separated at sides in a straight line. 



Wings rather narrow, hyaline; petiole of second marginal cell one-third as 

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

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

 veins dense, elongate-ovate, black, with a blue reflection on the costa. Halteres 

 whitish with black knobs. 



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

 femora whitish beneath; tibiae and tarsi with a bright bronzy luster beneath; 

 mid tarsi with apical third of second and all of third, fourth, and fifth joints 

 white outwardly; hind legs with last two tarsal joints whitish beneath, except 

 at their tips. Claw formula, 0.0-0.0-0.0. 



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



Male. — Palpi short, slender, about one-fifth as long as proboscis. Antennaj 

 similar to those of the female, a small secondary subapical whorl on each seg- 

 ment, the basal whorls longer and denser than in the female. Coloration similar 

 to female. Wing narrower than in the female, venation and vestiture similar. 

 Abdomen subcylindrical, slightly enlarged towards tip, with groups of coarse 

 bristles apieally. Legs with tibise of front pair pale brassy beneath, their apices 

 and tarsi bronzy beneath; mid legs brilliant brassy beneath, becoming almost 

 silvery on last four tarsal joints and spreading onto outer side ; hind legs with 

 femora and tibiae pale brassy beneath, tarsi silvery beneath along their entire 



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