49 



Clusiaeia, subgen. n. 



Characters as stated in key. 

 Genotype, the following species. 



Clusiodes (Clusiaria) duplicata, sp. n. 



Similar to melanostoma (Loew) to which it will run in my revision 

 of the family already referred to, differing as stated in the key in 

 this paper. The male has the face and cheeks more extensively 

 blackened than in melanostoma, the arista brown, third antennal 

 segment slightly browned at insertion of arista, and the frontal 

 bristles black instead of brown as in that species. The females 

 may be distinguished by the orbital bristling, and the color of 

 arista and third antennal segment as in males. 



Length, 4 to 4.5 mm. 



Type, male, allotype, and two male and two female paratypes, 

 Glen Echo, Maryland, July 2, 23, and August 8, 1922 (J. R. 

 Malloch). Taken on a rotten tree trunk overhanging a stream. 



Paratypes in collection of Boston Society of Natural History. 



Columbiella, subgen. n. 



Characters as stated in key. 

 Genotype, the following species. 



Clusiodes (Columbiella) apiculata, sp. n. 



Male. — Very similar to albimana in color and habitus. Dorsum 

 of thorax, upper half of pleura, and abdomen brownish black. 

 Third antennal segment with a very small brownish mark at 

 insertion of arista. Other characters as stated in key. 



Length, 3 mm. 



Type, Milford, New Hampshire, June 23, 1914. Paratype male, 

 Manchester, Vermont, June 4, 1910 (C. W. Johnson). 



Clusiodes (Columbiella) johnsoni, sp. n. 



Male. — Very similar to the foregoing species; differs as stated 

 in key. The cloud over discal cell is less distinct. The hypopygial 

 claspers are very small, and like those of the preceding, furnished 

 with short black hairs. 



Length, 3 mm. 



Type, Echo Lake, Mt. Desert, Maine, July 12, 1918. Paratype, 

 Burlington, Vermont, June 23, 1906 (C. W. Johnson). 



Clusiodes (Columbiella) nigripalpis, sp. n. 



Male. — A larger and darker species than the last but the 

 thoracic dorsum is similarly colored. Third antennal segment 



