DoHchupod'uLv. of St. Vincent (JVest Indies). 837 



Neurigona, 

 Eoadani, Prod. Dipt. Ital., 142, 1856. 



1. Neurigona signtfera, n. sp. 

 $ . Face very uarrow. Immediately under the antennge is a 

 triangular portion, yellow. Below this there is only a narrow 

 groove between the eyes to below the middle, from this point the 

 face protrudes as a narrow, whitish wedge, slightly wider at the 

 bottom. Palpi yellow. Proboscis brownish. Front greenish- 

 brown, a little dusted, converging below. Antennaa yellow, third 

 joint with a short point, arista yellow. Inferior orbital cilia 

 whitish. Occiput green with white dust. Thorax dark yellow, 

 glabrous, with black bristles. Acrostichal bristles small, in two 

 rows. On each side of the acrostichal bristles in front an area of 

 small bristles, bounded by the humeri and the anterior margin. 

 The characteristic flat bare disk of the back part of the dorsum is 

 of a beautiful greenish-blue colour, which extends to the disk of 

 the scutellum. Sides and border of the scutellum yellow. Two 

 very large bristles between two very minute ones on the border. 

 A very large bristle behind the root of the wing. PleuriB deep- 

 yellow, imperceptibly dusted, a dark spot above the middle coxa. 

 Tegula, cilia whitish. Abdomen slender, yellow, the segments 

 beyond the second successively shorter. The second segment 

 bears near its anterior margin an opaque black band, emarginate 

 behind in the middle and rounded at each end It is about half 

 as wide as the segment. The following segments have similar 

 bands, less emarginate and occupying more of the width of the 

 segment, to the fifth, which is wholly black across the dorsum ; 

 like the others it is yellow along the ventral side. Hypopygium 

 shining black, turned under, club-shaped, not much exserted, the 

 appendages not distinct. All the coxte yellow ; front ones long, 

 with black hairs and mixed brownish and yellowish bristles ; 

 middle ones with black hairs ; hind ones with a single bristle on 

 the outer side. Legs yellow, simple, the bristles small. Tarsi a 

 little infuscated toward the tip. Wings a little yellowish, fourth 

 vein in its last segment only very gently curved, almost perfectly 

 parallel with the third, 



$ . Face narrow, strongly protruding below, yellow, and 

 yellow pollinose. Palpi larger than in the male. Third joint of 

 antennte small, exceedingly short, almost kidney-shaped. 



Length 3"5 mm. ; of wing, 3"4 mm. 



Seashore to 1500 feet altitude. Two males and two 

 females. 



