WYEOMYIA CELJENOCEPHALA 155 



along anterior margin. Mesonotum clothed with elliptical, flat dark-brown 

 scales with bronzy and blue reflection; scales below lateral angles whitish; 

 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. Postnotum elliptical, prominent, a low, broad median carina, 

 dark brown, a group of small setse near posterior margin. Pleurae brown, coxoe 

 luteous, clothed with elliptical, flat silvery-white scales. 



Abdomen subcylindrical, compressed, truncate apically, and with many dark- 

 brown terminal setse; dorsal vestiture black, with a slight metallic reflection; 

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



Wings moderate, hyaline ; petiole of second marginal cell one-third as long as 

 its cell, that of second posterior cell shorter than its cell ; basal cross- vein distant 

 nearly its own length from anterior cross-vein ; scales of veins rather long, ligu- 

 late, becoming dense, short, and cuneiform on second to fourth veins, broadest 

 towards tip of wing, black, with a slight bronzy reflection on costa. Halteres 

 whitish with black knobs. 



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

 whitish beneath ; tibiae and tarsi of front and mid legs bright brassy beneath ; 

 hind tarsi with fourth and fifth joints white beneath, except at their tips. Claw 

 formula, 0.0-0.0-0.0. 



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



Life history and habits unknown. 



Salvador. 



Sonsonate, August 30, 1905, a single adult captured in the daytime (F. 

 Knab). 



WYEOMYIA CEL.ffiNOCEPHALA Dyar & Knab. 



Wyeomyia celcenocephala Dyar & Knab, Proc. Biol. Soc. Wash., xix, 140, 1906. 

 Wyeomyia celaenocephala Theobald, Mon. CuUc, v, 625, 1910. 



Obiginal Description of Wyeomyia cel^nocephala: 



Prothoracic lobes all dark brown or blue; eyes without a white border; no vertical 

 white patch; hind feet all dark, without white spots. 



One specimen, Trece Aguas, Alta Vera Paz, Guatemala (Schwarz & Barber). 



Type.— Cat. No. 10,006, U. S. Nat. Mus. 



Desceiption of Female or Wyeomyia celaenocephala (Male and Laeva Unknown) : 

 Female. — Proboscis rather long and slender, slightly swollen apically, vesti- 

 ture black with a bronzy and blue reflection ; labellae small, rounded, with fine 

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

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

 pilose, black; tori subspherieal, with a cup-shaped apical excavation, luteous 

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

 Clypeus rounded, luteous brown, pruinose. Eye separated at the vertex by a 

 narrow wedge, bluish black. Occiput badly denuded, clothed with flat brown 

 scales with a metallic reflection, a white patch below continued narrowly upward 

 along margin of eyes, apparently not reaching vertex; two setae at the vertex 

 and smaller ones along margins of eyes. 



Prothoracic lobes elliptical, distinctly separated, badly denuded, apparently 

 clothed with flat scales, dark with violaceous reflection, silvery below ; a row of 

 setas along anterior margin. Mesonotum clothed with elliptical, flat dark-brown 

 scales, with a bronzy and blue reflection ; scales below lateral angles silvery grey ; 

 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, dark brown, a group of small setae 

 near posterior margin. Pleuraa dark brown, coxae luteous, clothed with elliptical, 

 flat silvery- white scales. 



