66 [NrosQriTOES of north America 



12 speoinicns, Estero, Florida (J. B. Van Duzco), bred from larv.v in loaves 

 of Rroniolias. 



Type Cat. No. 9988, U. S. Nat. Mus. 



DKscKnn-ioN of Fkmai>e, Malk, and Larva of Wykomyia VANnizKF.i : 



FctuaJc. rroboscis niodoratc and distinctly swollon apioally. labolla^ small, 

 rounded, with fine outstanding sot:\3; vostiture bronzy-blaok. Palpi short, flat- 

 tened, one-sixtli as long as proboscis, bronzy-black. Antennae moderate, the 

 joints snbeqnal. nigoso, pilose, black; tori subspherical. with a cup-shaped 

 apical excavation, yellowish, with a slight pruinosity: hairs of whorls long, 

 rather sparse, black. Clypeus rounded, convex, hiteous brown, slightly pruinose. 

 Eyes separated at vertex by a rather broad wedge, bluish black. Occiput clothed 

 with flat, brown scales, with a metallic reflection, a silver-white spot at vertex, 

 a silvery ]iatch below at sides, running u]i along margin of eye; a row of setae 

 along margin of eyes. 



Prothoracic lobes elliptical, remote dorsally, clothed with flat scales, silvery- 

 white ; a row of seta^ in front. ]y[esonotun\ clothed with elliptical, flat, brown 

 scales with a submetallic reflection : scales on lateral angles whitish. Scutellum 

 weakly trilobate, with vestiture similar lo and continuous with that of mesono- 

 tum, each lobe with a small tuft of brown bristles. Postnotum elliptical, promi- 

 nent, with a broad, low nu^liaii carina, dark-brown, a group of small seta^ near 

 posterior margin. Pleura"" dark-brown, the C(n;v hiteous. clothed with elliptical, 

 llat, silvery-white scales. 



Abdomen subcylindrical. truncate apically. and with numerous long, dark- 

 brown terminal setas; dorsal vestiture black, with a slight metallic reflection; 

 the last segnuuit silver-s(>aled along the posterior margin; venter yellowish 

 white-scaled, the coloi^s separated at the sides in a straight line. 



Wings nuulerate, hyaline; petiole of second marginal cell more than one- 

 third ai! long as its cell ; that of second posterior cell slightly shorter than its 

 cell; ba.sal cross-vein distant nearly its own length from anterior cross-vein; 

 outstanding scales of veins long, ligulatc. black, with bronzy reflection on costa, 

 denser at apices of second to fourth veins, llalteres whitish, with black knobs. 



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

 and tibia^ pale-brassy beneath; fore tarsi with a silvery reflection beneath; mid 

 tarsi, with apical portion of second, tlie third and fourth joints white beneath; 

 hind tarsi broadly marked with white at base of each joint beneath. Claw 

 formula. 0.0-0.0-6.0. 



Ijcuigth : Body about 2 mm. ; wing 2.5 mm. 



MaJe. Proboscis more gradually thickened than in the female ; antenna"* sim- 

 ilar to those of the female, hairs of whorls slightly longer ; palpi as in the 

 female ; wings slightly narrower than in the female, the venation and vestiture 

 the same ; abdomen subcylindrical, sonu^what expanded towards apex, which 

 bears numerous coarse bristles. Coloration similar to the female, ^lid tarsi 

 with first joint shorter ami stouter than in front or hind legs, the tip of the 

 second, and all of third, fourth, and fifth joints broadly silvery-white beneath, 

 the first and second joints with a silvery luster beneath in some lights. Claw 

 fornmla. O.O-O.O-O.o'. 



TiCngth : Bo<ly about 3 mm. ; wing 2 mm. 



Genitalia, (plate 3, fig. 13) : Side-pieces rather short, tips conically tapered ; 

 clasp-filament with a vshort stem, divided into three lobes, the inner one rather 

 broad, pointed, with a row of long hairs on the margin; middle lobe thick, 

 conically pointed, with a group of long hairs near base, two rows of fine ones 

 outwardly, and a small lobe near tip ; outer lobe long, slender. Harpes broad, 

 inner margin thickened, ending in a pointed tip that bears several hairs. 



