1895.] ■ NATURAL SCIENCES OF PHILADELPHIA. 315 



and three sternopleural ; scutellum hearing two pairs of long marginal 

 macrochsetse and a short cruciate apical pair. Abdomen wholly 

 gray pollinose, with light and olive gray reflections; first segment 

 destitute of dorsal macrochsetse, second with a marginal pair, the 

 third and fourth each with a marginal row. Wings hyaline, third 

 vein with a few bristles at base, the others bare; costal spine minute, 

 bend of fourth vein with a rounded angle, apical cross vein nearly 

 straight, apical cell open. Pulvilli less than half as long as the last 

 tarsal joint. 



$ same as the 9 with the following exceptions: Entire antennae, 

 sides of first two abdominal segments and front angles of the third, 

 yellow. Front one-third as broad as either eye, no orbital bristles, 

 only one frontal bristle in each row curving backward, antenna? 

 three-fifths as long as the face, the third joint two and one-half times 

 as long as the second. 



Length 6 to 7.5 mm. Lake Worth and Charlotte Harbor, 

 Florida, Mrs. A. T. Slosson. One male and three females. 

 Gymnodexia zonata n. §p. 9 . 



Black, the antenna?, anterior portion of the cheeks, palpi, labella, 

 knees and abdomen, yellowish, the latter on sides of first three 

 segments and a dorsal vitta on the same, black. Front at vertex 

 four-fifths as wide as either eye, vitta next the antenna? three-fourths 

 as wide as either side of the front, the latter and the face whitish 

 pollinose; two pairs of orbital bristles; frontal bristles descending 

 almost to insertion of antenna?, three in each row curving backward; 

 sides of face bare; vibrissa? inserted almost on- the oral margin, two 

 or three short bristles above each; antenna? six-sevenths as long as 

 the face, the third joint four times as long as the second, arista long- 

 plumose; cheeks nearly as broad as the eye-height; proboscis robust, 

 the portion beyond the basal articulation slightly over half as long 

 as height of head. Thorax gray pollinose and marked with four 

 black vitta?; three postsutural and two sternopleural macrocha?ta?; 

 scutellum bearing three long marginal pairs. Abdomen shining 

 except the bases of the last three segments which are gray pollinose, 

 most extended on the second, where it reaches slightly beyond the 

 middle: first segment destitute of dorsal macrocha?ta?, second with a 

 marginal pair, third with a marginal row, the fourth with scattered 

 macrocrneta?. Wings hyaline, slightly smoky along the costa and 

 bordering the veins; third vein bearing four bristles at the base, the 



