WYEOMYIA TRINIDADENSIS 61 



hind legs without conspicuous pale luster beneath. Abdomen expanded towards 

 tip, the pale dorsal bands visible on fifth and sixth segments ; tip with numerous 

 coarse ferruginous hairs. Antennae with the segments slightly shorter than in 

 female, gradually thickened to insertions of hair- whorls; hairs of whorls long, 

 but rather sparse; no secondary subapical whorls. Claw formula, 0.0-0.0-0.0. 



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



Genitalia (plate 6, fig. 40) : Side-pieces slender, over three times as long 

 as wide ; clasp-filament with a long, slender branch at base, ending in an ellip- 

 tical apical enlargement, cleft and hairy on margin ; shaft again furcate, one 

 branch short and smooth, the other very long and spicular at tip. Harpes long, 

 flat, with a thickened margin, which is curved and dentate at tip. Harpagones 

 small. Unci forming a basal cone. Basal appendages, each with three 

 long spines. 



Larva, Stage IV (plate 87, fig. 277). Head rounded, a notch at insertion 

 of antennae, front margin arcuate. Antennre slight, cylindrical, smooth, a 

 small hair at outer third ; a long spine, two short ones, and a long digit at tip. 

 Eyes small, round. Head-hairs in multiple tufts. Mental plate wide, narrowly 

 triangular; a high projecting central tooth and nine on each side, the basal 

 ones more remote and deeply cut, the last a little larger. Mandible quadrangular 

 with a filament from a notch before the tip ; an outer row of long cilia form a 

 collar; a row of feathered filaments on outer margin, the outer ones longest; 

 dentition of four teeth on a process, the first longest ; a broad filament and a 

 row of short, feathered filaments within ; process below short, taking the place 

 of the basal angle, upper fork indicated only by the tuft, lower a slight pointed 

 prominence with apical tuft ; a row of fine hairs between upper tuft and denti- 

 tion; a row of hairs within approximate to basal hairs. Maxilla conical, divided 

 by a suture; inner half the larger, a band of coarse hairs at tip; outer half with 

 two minute filaments next the suture and a subapical spine, which exceeds the 

 apical hairs. Palpus very short, not more than one-third the length of the 

 maxilla; apical digits small. Thorax subquadrate; hairs abundant. Abdomen 

 slender, the hai^s long. Air-tube slender, six times as long as wide, strongly 

 tapered, at outer third less than half the basal width ; surface smooth ; subdorsal 

 and subventral series of long, single, feathered hairs in a row on each side, the 

 apical ones smaller and more remote; pecten a short series of long, closely 

 crowded teeth. Lateral comb of eighth segment of many spines in two irregular 

 rows; single spines very long, tips slightly widened and fringed with spinules. 

 Anal segment about as long as wide, with a dorsal plate reaching well down the 

 sides; dorsal tuft of three long hairs on each side; two long lateral hairs on 

 plate; subventral hairs a pair of stellate tufts; no ventral brush. Anal gills 

 nearly three times as long as the segment, lanceolate, subequal. 



The larvae live in the water between the leaves of bromeliaceous plants. The 

 eggs are unknown. 



Island of Trinidad and Tobago Island, British "West Indies. 



Sangre Grande, Trinidad, larvge in water in bromelias (F. W. Urich) ; Port 

 of Spain, Trinidad, larvae in water in bromelias, associated with Wyeomyia 

 tehstica and Culex imitator (F. W. Urich) ; Tobago Island, near Trinidad, 

 larvae in water between leaf-sheaths of bromelias, July 13, 1905 (A. Busck). 



Wyeomyia trinidadensis was referred by Theobald as a synonym of his W. 

 longirostris from Brazil. We have a single specimen of the latter species from 

 Sao Paulo, Brazil, kindly sent us by Dr. Lutz. This shows the vestiture of the 

 mesonotum of a dark bronzy and blue iridescence, whereas the specimens from 

 Trinidad have these scales of a dull gray-brown ; we therefore think that they 

 represent distinct species. 



