236 THE CANADIAN ENTOMOLOGIST. 



Hypostena setinervis, n. sp. — $ . Black, the palpi, apex of proboscis, 

 abdomen, coxae, femora and tibi?e, yellow, the last two segments of the 

 abdomen partly tinged with brown. Front as wide as either eye, two 

 pairs of orbital bristles, frontals descending to apex of second antennal 

 joint, antennte as long as the face, the third joint six times as long as the 

 second, arista thickened almost to the middle, vibrissae on a level with 

 front edge of oral margin, ridges bristly on the lowest fourth. Thorax 

 gray pruinose, marked with four black viltae ; four postsutLiral and two 

 sternopleural macrochaetre, scutellum bearing three pairs of long marginal 

 and a short apical pair. Abdomen polished, bases of last three segments 

 whitish pruinose, first three segments bearing only marginal macrochaeite, 

 venter destitute of short, stout spines. Tarsi not dilated, hind tibiae sub- 

 ciliate. Wings hyaline, third vein bristly to slightly beyond the small 

 cross-vein, hind cross-vein nearer to the small than to bend of fourth vein, 

 calypteres white. Length, 5 mm. Biscayne Bay, Florida. A single speci- 

 men collected by Mrs. A.T.Slosson. Type No. 4067, U. S. Nat. Museum. 



Exorista dorsalis^ n. sp. — 9 • Black, the palpi and sometimes the 

 sides of the abdomen, except at each end, yellow. Front from three-fifths 

 to two-thirds as wide as either eye, two pairs of orbital bristles, frontals 

 descending to apex of second antennal joint, sides of face and of front 

 in front of the orbitals silvery-white pruinose, antennae nearly as long as 

 face, the third joint from three to four times as long as the second, arista 

 thickened on the basal two-fifths, the penultimate joint only slightly 

 longer than broad, facial ridges bristly on the lowest two-fifths, cheeks 

 one-sixth as broad as the eye-height. Thorax polished, having a strong 

 brassy tinge, without a trace of light coloured pruinosity on the dorsum ; 

 three postsutural and three sternopleural macrochaetse, scutellum bearing 

 three pairs of long marginal and a short apical pair. Abdomen somewhat 

 polished, thinly gray pruinose, last three segments bearing discal as well 

 as marginal macrochaetJB. Hind tibiee outwardly ciliate, middle tibise 

 each bearing a single macrochaeta on the front side near the middle. 

 Wings hyaline, third vein bearing from two to four bristles near its base, 

 bend of fourth vein destitute of an appendage, calypteres whitish. 

 Length, 6 to 7 mm. North Mt., Pa. (Sept. 2, 1S97 '> Mr. C. W. Johnson), 

 and Ga. Two specimens. Type No. 4068, U. S. Nat. Museum. 



Brachycoina She/doni, n. sp — ^ 5 • Black, a subtriangular spot out- 

 side of each vibrissa, brown, a yellow ring on the arista beyond the thick- 

 ened base. Front of male one fourth as wide as in the female, as wide as 



