24 PBOCEEDIXGS OF THE NATIONAL MUSEUM. vol.65 



/S'. seticauda Malloch. — Pliimmer Island, Maryland, May 30, 1913, 

 R. C. Shannon; June 2. 1912, July 19, 1914, McAtee. 



>S'. tenuispina Loew. — Great Falls, Virginia, June 21 : Falls Church 

 Virginia, June 24, N. Banks : Plumuier Island. Maryland, May. 1908, 

 William Palmer; May 23, 1914, June 9, 1913, R. C. Shannon; May 

 24, 1914, June 29, 1913, McAtee; Glen Echo, Maryland, August 2, 

 1922, Malloch. 



DESCRIPTIONS OF TWO NEW SPECIES. 

 SAPROMYZOSOMA DECEPTOR Malloch, new species. 



Female. — Similar to fraterna in color. Most closely allied to no- 

 tata Fallen, differing in having the wing markings less distinct, the 

 arista with its longest hairs not noticeably longer than its basal 

 diameter, and the bristles over all not so long and strong. 



Length, 3 mm. 



Type and one paratype. — White Mountains, New Hampshire (Mor- 

 rison). Type, Cat. No. 26390. U.S.N.M. 



SAPROMYZOSOMA NIJDIFEMUR Malloch, new species. 



Male. — Agrees with inaequalis and its allies in color, but in the two 

 specimens before me there is a dark part on third vein beyond outer 

 cross- vein at the point where the dark spot is present in those forms 

 that have distinct spots on wings. There are no hairs between the 

 acrostichal bristles but otherwise the thorax is as in iTiaequalis. 

 The tergites of abdomen descend so far that it is impossible to dis- 

 tinguish the fifth sternite, but it has evidently no long processes. 



Length, 3 mm. 



Type and one paratype. — Kaslo, British Columbia, June 23 and 

 July 7 (R. P. Currie). Type, Cat. No. 26391. U.S.N.M. 



Genus PERISCELIS Loew. 



This genus is someM^hat doubtfully placed in the Sapromyzidae 

 oAving to the lack of mesopleural and preapical tibial bristles as well 

 as the presence of but one orbital bristle. The divergent postvertical 

 bristles and peculiar subcostal vein, which is similar to that of the 

 Trypetidae, distinguish the genus from any other in the three fami- 

 lies dealt with in this paper, but it is more evidently related to 

 Sapromj'zidae than to any other family. 



At present it is recorded only from Illinois, where it has been 

 taken on sap exuding from trees, but its small size and habits prob- 

 ably accounts for its absence from collections. Malloch redescribed 

 this genus under the name Phorticoides with one species, flinti Mal- 

 loch, which may be synonymous with annulata Fallen, a European 

 species. 



