WYEOMYIA SCOTINOMUS 157 



Pleurae dark brown, coxae luteous, clothed with elliptical, flat silvery-white 



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

 brown terminal setse ; dorsal vestiture black, with a faint greenish and bluish 

 luster; venter silvery white, the colors separated in a straight line; the scales 

 raised along the mid- ventral line. 



Wings moderate, hyaline ; petiole of second marginal cell a little more than 

 one-third as long as its cell ; that of second posterior cell a little longer than its 

 cell; basal cross- vein incident with anterior cross- vein; outstanding scales of 

 veins ligulate, black, with a blue reflection on costa, denser and broader on forks 

 of second and fourth veins and on outer half of third, becoming ovate at tip of 

 wing. Halteres whitish with black knobs. 



Legs rather long and slender, vestiture black with a bronzy and blue luster, 

 a stronger bronzy luster beneath; femora pale beneath; mid tarsi with basal 

 two-thirds of fourth joint silvery white on outer side, third joint with a strong 

 brassy luster without ; hind tarsi with second and third joints with a small spot 

 beneath at base, fourth and fifth joints silvery white beneath except at their 

 apices. Claw formula, 0.0-0.0-0.0. 



Length : Body about 3.5 mm. ; wing 3.8 mm. 



Larva, Stage IV (plate 93, fig. 299). — Head rounded, the latero-posterior 

 angles moderate, the occipital foramen reaching them ; upper head-tuft short, in 

 fours, lower single ; ante-antennal tuft in fours ; antennae moderate, rather long, 

 with a double hair at outer third. Lateral abdominal hairs in fours on first seg- 

 ment, in twos on second to sixth, single on seventh ; lateral comb of eighth seg- 

 ment of about twenty scales in a single straight row, followed by a long single 

 hair. Air-tube slender, slightly fusiform, about six times as long as wide at 

 base, covered uniformly, but sparsely, with moderate single hairs, terminal 

 fourth nearly without hairs; terminal hooks moderate. Anal segment longer 

 than wide, with a large dorsal plate ; dorsal tuft of two long hairs on each side ; 

 lateral hair single, long; subventral tuft moderate, multiple. Anal gills over 

 twice as long as the segment, stout with broadly rounded tips, lower pair slightly 

 longer and stouter than upper pair. 



The larvae live in water between the leaves of epiphytic Bromeliaceae. Mr. 

 Jennings took them in a bromeliad on a fallen tree, associated with Wyeomyia 

 dbrachys. 



Panama. 



Caldera Island, Porto Bello Bay, January 4, 1908 (A. H. Jennings). 



WYEOMYIA SCOTINOMUS (Dyar & Knab). 



Phoniomyia scotinomus Dyar & Knab, Journ. N. Y. Ent. Soc, xv, 209, 1907. 

 Phoniomyia scotinomus Busck, Smiths. Misc. Colls., quart. Iss., lii, 75, 1908. 

 Wyeomyia dymodora Dyar & Knab, Proc. U. S. Nat. Mus., xxxv, 68, 1908. 

 Phoniomyia scotinomus Theobald, Mon. Culic, v, 579, 1910. 

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



Oeiginal Desckiption of Phoniomyia scotinomus: 



J. — Proboscis long and slender, very slightly enlarged towards the apex, black; 

 palpi very short; clypeus yellow-brown; occiput dark scaled, the vertex and dividing 

 line of the eyes obscurely silvery; prothoracic lobes prominent, approximated, 

 clothed with dark scales with a blue and violet luster; mesonotum clothed with 

 dark-brown scales with slight bronzy luster, faintly greenish in certain lights; 

 scales of the scutellum like those of the mesonotum; setae of the scutellum dark; 

 metanotum deep brown with a group of setae towards the apex; abdomen black 

 scaled above, with faint bluish luster, beneath lustrous whitish, the colors separated 

 in a straight line on the sides, apex of the abdomen dilated; legs dark scaled above. 



