1913] North American Dipterous Genus Neurigona 35 



trades as a narrow whitish wedge, sHghtly wider at the bottom ; pro- 

 boscis brownish; palpi yellow; front greenish-brown, a little dusted, 

 converging below; antennae 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 these in front is an area of 

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

 flat bar2 disk is a beautiful greenish-blue color, 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; pleurae deep yellow, imper- 

 ceptably dusted, a dark spot above middle coxse; tegulas cilia whitish. 

 Abdomen slender, yellow, the segments beyond the second successively 

 shorter, the second segment bears near its front 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 

 segments, the fifth is wholly black across the dorsum. Like the others 

 it is yellow along the ventral sides; hypopygium shining black, turned 

 under, club-shaped, not much exserted, the appendages not distinct. 

 All the coxse yellow, front ones long with black hairs and mixed brown- 

 ish-yellow bri.stles, middle ones with black hairs, hind ones with a 

 single bristle on the outside; legs yellow, simple, the bristles small, tarsi 

 a little infuscated towards the tip. Wings a little yellowish, fourth vein 

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

 with the third. 



Female : Face narrow, strongly protruding below, yellow, and yellow 

 pollenose, palpi larger than in the male; third joint of the antennae 

 small, exceedingly short, almost kidney shaped. 



Length 3K mm., wing 3 4/10 mm. 



St. Vincent, 1500 feet altitude. Occurs also in Grenada." 



Note. — N. brasiliensis Schin. is closely related to this species 

 agreeing with it in coloration; it was described from a female, 

 but it can be distinguished from signifer Aid. by its having a 

 central line on the dorsum, extending from the flattened space 

 before the scutellum about half way to the front of the thorax,, 

 this line is the same color as the flattened space; and by having 

 the third and fourth veins much more convergent than in 

 signifer. 



I have seen two specimens which I refer to brasiliensis, one a, 

 male in the National Museum, and the other a female in the 

 collection of Prof. J. M. Aldrich; the former is from Grenada,, 

 and the later from Vera Cruz. 



