ARTHEOPODA OF THE COMMANDER ISLANDS. 345 



Family SCATOPHAGID^. 



(19) Seatophaga atercoraria Linnseus. Fauna Suecica, 1763, p. 1861. 



Oopper Island. Three males collected in August, 1897, by Mr. Barrett-Hamilton. 

 Specimens were also taken on Oopper and Bering islands by Dr. Stejneger in 1882 

 and 1883. A nearly cosmopolitan species. 



(20) Seatophaga islandica Becker. Berl. Ent. Zeit., May, 1894, p. 175. 



Copper Island. Two males and five females collected by Mr. Barrett-Hamilton in 

 August, 1897. Described from Labrador and Iceland. 



(21) Seatophaga dasythrix Becker. Loo. clt., p. 173. 



Bering Island. A male specimen collected by Mr. Barrett-Hamilton in July- 

 August, 1897. Originally described from Bering Straits. 



(22) Seatophaga intermedia Walker. List Dipt. Brit. Museum, Part IV, 1849, p. 980. 



Bering Island. A female specimen taken with the preceding species. Described 

 from Nova Scotia. 



Family HBLOMTZID^. 



(23) Leria tristis Loew. Berl. Ent. Zeit., 1862, p. 225. 



Bering Island, collected in July-August, 1897, by Dr. L. Stejneger. Copper 

 Island, collected in August, 1897, by Mr. Barrett-Hamilton. Three males and two 

 females. Originally described from Lake Winnipeg, British America. 



Family PHYCODEOMID^. 



(24) Coelopafrigida Fallen. Dipt. Sueciaj, Hydromyzidse, 1823, p. 6. 



Copper Island in August and Bering Island in July-August, 1897. Ten speci- 

 mens collected by Mr. Barrett-Hamilton. Dr. Stejneger also took specimens on 

 Bering Island in 1882-83. The species is nearly cosmopolitan in the Northern 

 Hemisphere. 



Family TEYPETID^. 



(25) Trypeta flaveola, new species. 



Female. — Yellow, an ocellar dot, two spots on the metanotum, and the first seg- 

 ment of the ovipositor black; bristles and hairs also black; third antennal joint 

 rounded at the apex, arista bare, proboscis robust, not geniculate. Thorax destitute 

 of mediodorsal bristles in front of the suture, one sternopleural bristle, scutelluni 

 bearing four marginal ones. Ovipositor only slightly flattened, the first segment 

 slightly longer ihan the sixth abdominal segment. Wings hyaline, a black spot fill 

 ing the space between the ends of the auxiliary and first veins, a fascia extending from 

 base of submarginal cell to lower outer angle of the anal, a spot near middle of the 

 penultimate section of the fifth vein, a large spot covering the hind crossvein and 

 extending to the hind margin of the wing, finally a black border along the apex of 

 the wing, extending from a short distance beyond the tip of the first vein to a short 

 distance beyond the apex of the fourth; small crossvein faintly clouded with brown; 

 first and third veins bristly, lower outer angle of anal cell prolonged in a point. 

 Length 5.5 mm. 



Type.— 'So. 4053, U. S. N. M. 



Bering Island. A single specimen collected in July-August, 1897, by Dr. L. 

 Stejneger. Belongs to the genus Trypeta as restricted by Schiner and Loew. 



