1913] North American Dipterous Genus Neurigona 43 



Prof. C. W. Johnson sent me one male, taken at Alt. Ascutney, 

 July 11, and three females taken at Norwich, July 9; both 

 places are in Vermont. The specimens that I took were found 

 from June 6 to July 4. 



Note. — -The male of this species in general appearance 

 resembles the male of iioridida var. infuscata, but can be readily 

 separated by the difference in venation and the greater rel- 

 ative length of the fourth joint of the front tarsi to the third. 



I have in my collection seventeen females that seem to be a 

 variety of this species, they were taken at East Aurora, N. Y., 

 June 15th and 22d, 1912. They are somewhat smaller, (33^-4 

 mm.), and paler; some of them have sharply defined black 

 bands on the abdomen; the third and fourth veins approach 

 each other a very little more than in the typical forms, the 

 fourth vein ending exactly in the apex of the wing. 



There are two females in Prof. Aldrich's collection that seem 

 to be the same as the above variety. They were taken at 

 Battle Creek, Mich., and Ithaca, N. Y. 



15 Neurigona viridis n. sp. 



Figure 15. 



Thorax bright metallic green, sometimes coppery on the dorsum; 

 abdomen mostly dark metallic green, with the first two segments 

 partly yellow; hypopygium black, polished; front tarsi with the fourth 

 and fifth joints a little flattened; wings with the third and fourth veins 

 nearly parallel. Length, 3^-4 mm. 



Male : Eyes contiguous on the center of the face for some distance, 

 leaving only a small triangle above and below; face and palpi silvery 

 white; palpi rather large and with yellowish bristles at tip; proboscis 

 yellow ; front and occiput dark metallic green, with white pollen ; antennas 

 deep yellow, the third joint a little brownish at tip, arista brown; 

 frontal bristles black, orbital cilia and post-vertical bristles whitish. 

 Thoracic dorsum bright shining green, sometimes with coppery reflec- 

 tions, and a little dulled with whitish pollen; pleurae dark greenish, the 

 ground color partly concealed by grayish white pollen ; scutellum bright 

 green on the disk, yellow below and usually on the lateral angles; 

 metanotum darker green with white pollen. Abdomen with the first 

 two segments yellow, a large dark greenish spot on the dorsum of the 

 second, which sometimes covers most of it; the following segments 

 dark metallic green or greenish black, with the posterior edges yellow 

 and thickly covered with white pollen, in some specimens these edges 

 very narrow; hairs of the abdomen mostly pale, and those on the hind 

 margins of the segments rather long; hypopygium rather large, black, 

 polished, and with a pair of long whitish appendages on the posterior 

 margin. Legs pale yellowish; the hairs and bristles of the front coxae 



