60 MOSQUITOES OF NOETH AMERICA 



Wings with brown scaled veins, blackish along the costa and towards the roots, the 

 base being ochraceous-yellow; the lateral scales are long and thin, the median 

 small, rather thick; first sub-marginal cell longer and narrower than second pos- 

 terior cell, its stem not quite half the length of the cell, its base a little nearer the 

 base of the wing than that of the second posterior cell; stem of the latter longer 

 that the stem of first sub-marginal cell, equal to about two-thirds of the length of 

 the cell; posterior cross-vein a little longer than the mid cross-vein, distant from the 

 latter about its own length. 



Halteres with bright, brown stem and fuscous knob. 



Length. 2.8 mm.; with proboscis 4.5. 



Habitat. Trinidad (Urich). 



Time of capture. November and December. 



Observations. Described from a good series of $'s sent by Mr. Urich. It can at 

 once be told from all other Wyeoynyias by the abdomen having silvery-white lateral 

 spots, which form bands apically, and by its black scaly appearance, the white 

 abdominal bands being very clear and also the white on the tarsi. Some specimens 

 show more abdominal bandings than others. I think the white on the mid tarsi 

 is entirely dorsal. The proboscis is very long. They are found in cocoa groves 

 bordering the forests, and in the forest amongst the second growth, and do not 

 enter houses. 



Description of Femaue, Male and Larva of Wyeomyia trinidadensis : 



Female. Proboscis very long and slender, uniform, labellge conically tapered, 

 with fine outstanding setae; vestiture black, with bronzy luster. Palpi small, 

 one-eighth as long as proboscis, clothed with bronzy black scales and rather long, 

 fine setffi. Clypeus rounded triangular, brown, shining. Antennae moderate, 

 the joints subequal, rugose, coarsely pilose, black ; tori subspherical, with a cup- 

 shaped apical excavation, dark brown, slightly pruinose ; hairs of whorls sparse, 

 long, black. Eyes black. Occiput broad, clothed with flat, appressed scales, 

 black, with metallic reflection, a vertical violaceous patch, silvery in some lights ; 

 a silvery-white patch at the sides below. 



Prothoracic lobes well separated dorsally, brown, clothed with pale violaceous 

 scales, base silver-scaled, with a row of set^ on anterior margin. Mesonotum 

 black, clothed with narrow, elliptical, dark-brown scales with bronzy reflection, 

 almost silvery in some lights, bristles over roots of wings short, pale. Scutellum 

 trilobate, clothed with elliptical, flat silvery scales, each lobe with a tuft of black 

 bristles. Postnotum elliptical, prominent, dark brown, a tuft of small setae 

 posteriorly. Pleurae brown, coxae luteous, clothed with elliptical silvery-white 

 scales. 



Abdomen subcylindrical, the tip blunt, with brown terminal setae; dorsal 

 vestiture black, a few silvery-white scales forming bands at bases of last four 

 segments ; first abdominal segment black, with silvery luster in some lights, a 

 silver patch at the sides ; venter yellowish silvery -white, the colors separated on 

 the sides in an extremely angular line incised at the base of each segment; 

 scales roughened along medioventral line. 



Wings moderate, hyaline ; petiole of second marginal cell half 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 spatu- 

 late, black, with bronzy reflection, broader and denser on forks of second vein. 

 Halteres largely blackish. 



Legs slender, black with bronzy reflection, yellowish-white beneath ; tibiae and 

 tarsi with bronzy luster beneath, mid legs with third and fourth tarsal joints 

 whitish beneath ; hind legs with base of fourth and fifth joints whitish beneath. 



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



Male. Coloration as in female. Fourth and fifth joints of middle tarsi dark, 

 vestiture roughened, the last joint very short, third joint and apex of second 

 silvery white-scaled, encircling the joints and merging beneath with the brassy 

 color, which extends upward to base of leg ; hind tarsi without white, front and 



