WYEOMYIA PHROSO 149 



reflection; venter silvery white, the colors separated at the sides in a straight 

 line, the scales raised along the mid-ventral 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 ; outstanding scales of 

 veins lignlate, narrowly ovate on forks of second and fourth veins and outer half 

 of third, black, with bronzy reflection on costa. Halteres whitish with black 

 knobs. 



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

 whitish beneath; tibite and tarsi bronzy beneath, brassy on the mid legs; 

 hind legs with first tarsal joint white beneath on basal half, second and third 

 white at base, fourth and fifth white beneath except at tips. Mid tarsi with 

 two unequal claws, one strongly curved, those of hind tarsi small and subequal ; 

 formula, 0.0-0.0-0.0. 



Length : Body about 2.8 mm. ; wing 2.3 mm. 



Genitalia (plate 5, fig. 29) : Side-pieces over twice as long as wide, the tips 

 strongly tapered ; inner margin rather broadly thickened ; three long setae 

 towards the base in line ; basal lobes rounded triangular, setose. Clasp-filament 

 with a bent, slender stem, tip expanded into three lobes ; middle lobe large, 

 broadly quadrate, with a row of setae along the margin and across the disk; 

 inner lobe short, truncate, like a lateral fold of middle lobe ; outer lobe small, 

 with a large erect terminal spine. Harpes elliptical, narrow, the inner margin 

 thickened, bent at the tip and obscurely dentate. Harpagones and unci forming 

 basal cylinders. Basal appendages represented by two stout setae on each side. 



Mr. Busck obtained the larvae of this species, but preserved no skins. 



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

 Busck bred our single specimen from a Tillandsia in which were associated 

 Wyeomyia circumcincta, Wyeomyia philophone, and Culex jenningsi. 



Panama. 



Tabernilla, Canal Zone, July 10, 1907 (A. Busck). 



WYEOMYIA PHROSO, new species. 

 Description of Female of Wyeomyia phkoso (Male and Larva Unknown) : 



Female. Proboscis short and stout, somewhat enlarged towards tip, labellae 

 small, rounded, with fine outstanding setse ; vestiture bluish black, with a line of 

 brassy scales beneath. Palpi short, one-fifth as long as proboscis, bronzy black. 

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

 tori subspherical, "with a cup-shaped apical excavation, blackish ; hairs of whorls 

 long, rather sparse, black, Clypeus broad, truncate in front, convex, blacldsh. 

 Eyes separated at vertex by a narrow wedge, bluish black. Occiput clothed with 

 flat brown scales with a dull bronzy and blue reflection, with an indistinct paler 

 margin along the eyes, a white spot at lower part of side; two setse at the vertex 

 and a row of smaller ones along margin of eyes. 



Prothoracic lobes large, elliptical, not closely approximated dorsally, clothed 

 with flat dark-brown scales with violaceous and coppery luster; a row of black 

 bristles on front margin. Mesonotum clothed with elliptical, flat dark-brown 

 scales with a bronzy and blue reflection ; scales below lateral angles pale ; 

 setae over roots of wings coarse, blackish. Scutellum weakly trilobate, with vesti- 

 ture 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 coarse setae near posterior margin. Pleurae brown, coxae luteous, clothed 

 with elliptical, flat white scales. 



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

 brown terminal setffi ; dorsal vestiture black, with a slight bronzy reflection ; 

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



