126 MOSQUITOES OF NOETH AMERICA 



ings as in the female; mid tarsi with a single claw, those of hind tarsi unequal; 

 formula, 0.0-0-0.0. 



Length : Body about 3 mm. ; wing 3.5 mm. 



Genitalia (plate 5, fig. 33) : Side-pieces twice as long as wide, the tips 

 conically tapered; a ridge or thickening along the middle runs nearly to the 

 tip, whence arises a large filament which is bent at right angles and expanded 

 on its apical half ; a single long seta below, the whole representing a basal lobe, 

 but apparently forming a part of the side-piece. Clasp-filament with long, 

 slender stem, the tip divided into three small lobes, the outer slender and hairy, 

 the middle one slender and bearing four stout teeth, the inner one sharply 

 pointed. Harpes broad, the inner edge thickened, bent at the tip and pointed. 

 Harpagones similar, smaller, their tips touching and forming a basal cone. 

 Unci similar, but still smaller. Basal appendages represented by three or four 

 leaf-like setse on each side. 



Larva, Stage TV (plate 90, fig. 289). — Head subquadrate, anterior margin 

 rounded, posterior angles marked, the occipital foramen reaching to the angles ; 

 antennae slender, smooth, with a minute hair towards the apex; dorsal head- 

 hairs single, the ante-antennal tuft double, as also the ones above the mouth. 

 Lateral abdominal hairs in twos after the second segment. Lateral comb of 

 eighth segment a patch of scales nearly three rows deep ; a single hair behind. 

 Air-tube slightly fusiform, rather stout, nearly five times as long as wide; four 

 single hairs on dorsal aspect, two on ventral aspect, between these a row of three 

 stout teeth, resembling pecten; terminal hooks rather small. Anal segment 

 as long as wide, the dorsal plate reaching well down the sides;- dorsal tuft of 

 five hairs on each side; lateral tuft of two long hairs; subventral tufts short, 

 multiple. Anal gills missing in our specimens. 



The larvae live in the water in the flower-cups of a species of Heliconia sim- 

 ilar to H. champneiana. 



Panama. 



Tabemilla, Canal Zone, March 13, 1908 (A. H. Jennings). 



Wyeomyia onidus is closely related to W. pseudopecten, W. eloisa and 1^. 

 pantoia. The differences indicated in the descriptions of the imagos are slight 

 and imimportant, and should not be relied upon. The male genitalia show, 

 however, that the species are distinct. The larvae, also, of these four species are 

 practically alike, and such slight variations as exist are individual rather than 

 specific. 



WYEOMYIA ADELPHA Dyar & Knab. 



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

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



Oeiginal Desckiption of Wyeomyia adelpha: 



Prothoraclc lobes entirely dark; head dark behind, the eyes with an even white 

 margin; middle legs with white marks on the tarsi. 



11 specimens, Esparta, Costa Rica (F. Knab). 



Type.— Cat. No. 10,000, U. S. Nat. Mus. 



Description of Female of Wyeomyia adelpba (Mau: and Labva Unknown) : 



Female. — Proboscis rather long, shortly swollen apically, the vestiture black 

 with a bronzy reflection; labellae small, rounded, with fiiie outstanding setsB. 

 Palpi short, flattened, one-sixth as long as proboscis, bronzy black. Antennae 

 moderate, the joints slender, subequal, rugose, coarsely pilose, black; tori 

 eubspherical, with a cup-shaped apical excavation, luteous brown, with a 

 whitish pruinosity; hairs of the whorls long, rather sparse, black. Clypeus 

 rounded, convex, 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 white spot at the vertex, a white patch below, ioined by a 



