102 



Thinophilus viridifacies, new species. 



c?. — Length 2.3 mm.; of female 2.7 mm. Face metallic green with thin 

 white pollen, more yellowish white on the lower half. Palpi yellow with white 

 pollen. Front dull green with a little white pollen. Occiput, dorsum of 

 thorax, pleurae and abdomen white pollinose. Lower half of occiput with long 

 white hairs. Antennae yellow; third joint small, brown, rounded but rather 

 flattened in outline at tip. 



Thorax coppery or green; abdomen green with bronze reflections and 

 conspicuous black hairs. Hypopygium small; outer appendages long, yellow; 

 there are also long blackish appendages above these next to the venter. 



Fore coxae largely yellow, at least on apical half. Femora and tibiae 

 yellow. Tarsi yellow only a little darkened at tip. Middle and hind tibiae 

 each with several small bristles above, the former with one small bristle on 

 lower posterior edge. All femora with several very small black bristles near 

 the tip. Joints of fore tarsi as 13-7-7-5-6; of middle ones as 18-8-7-5-5; of 

 hind pair as 14-13-8-7-8. Calypters, their cilia and the halteres pale yellow. 



Wings a little grayish, veins brown; cross- vein and last section of fifth vein 

 as 9 to 30. 



9 • — Face metallic green, as in the male, its pollen very thin, white 

 above, yellowish on lower part. Palpi appearing white from the thick white 

 pollen; front as in the male, except that the pollen on the front and also on the 

 dorsum of the thorax is more brown. The anterior femora are somewhat 

 infuscated on the middle for half their length or more. Otherwise about as in 

 the male. 



Described from two pairs taken at Edgartown, Massachusetts, 

 June 29, by C. W. Johnson. Holotype and allotype in the collec- 

 tion of the Boston Society of Natural History. 



This differs from Thinophilus prasinus Johnson in having the 

 face metallic, the whitish pollen scarcely dulling the ground- 

 color, in being much smaller and in having the front more metallic; 

 in a female paratype of Thinophilus prasinus that I have, the 

 front is opaque with white pollen, but in this form the female 

 has only a little brownish pollen on the front, and it has the 

 fore femora somewhat infuscated, while in the female of Thino- 

 philus prasinus the fore femora are not at all darkened. The 

 new species, Thinophilus ochrifacies, differs from both of these 

 species in having the face wholly opaque with thick yellowish 

 or brownish-yellow pollen. 



Gymnopternus singularis, new species. 



cf. — Length 2.6 mm. Face not very wide for the genus, brownish; palpi 

 and proboscis black. Front black with brown pollen. Antennae black; third 

 joint about as long as wide, pointed at tip, nearly straight on upper edge 

 beyond the nearly basal arista, rounded below on apical portion so as to form 

 a point at upper corner. Orbital cilia wholly black. 



Thorax green, dulled with brown pollen; prothorax with a large bristle 

 above fore coxae; pleurae more black. Abdomen dark green with black hairs, 

 quite shining. Hypopygium black, rather large; its lamellae yellow, narrow, 

 rounded when applied to the end of the hypopygium, fringed with a few black 

 hairs. 



All coxae and femora black, their tips narrowly yellow. All tibiae yellow, 

 still the tips of the posterior ones are black; middle and hind tibiae each with a 

 bristle below near apical third. Fore and middle tarsi black from the tip of 

 the first joint; hind tarsi wholly black. Joints of fore tarsi as 20-8-7-5-7; 



