1918] Aldrich — Notes on Diptera 33 



the third sinuous, ending a Uttle before apex, fourth very shghtly 

 turned forward near tip, less than third; no setae on any veins, no 

 costal spine; sixth vein does not reach margin, seventh parallel 

 with it. 



Legs: tibiae almost without bristles, hind basitarsus not with 

 spine below. 



(c) In the Carnegie Museum are three flies which were probably 

 captured farther north than any others on record. They were taken 

 by J. W. Goodsell, surgeon of the Peary Expedition, and are la- 

 beled, " 82 degrees north latitude, on the beach at the northeastern 

 extremity of L. Hazen, in the interior of Grant Land. June 7, 

 1908." This would be about 550 miles from the pole. One of the 

 specimens is FucelUa pictipennis Beck., a species described from 

 Greenland and taken since in the Arctic by the Canadian Arctic 

 Expedition. The other two specimens belong to PJiormia terroe- 

 novop Desv., described from Newfoundland and again from Green- 

 land, a circumpolar species which is common in the mountains of 

 the western states and occurs rarely in lower altitudes (Indiana, 

 New Jersey) . 



(d) Two or three years ago Professor Johannsen inquired of me 

 if I had any males of Lonchoptera. On going over my material, 

 I was surprised to find but two males; — one from Colorado, taken 

 by C. F. Baker, the other from the Parry Sound region of Ontario, 

 taken by H. A. Parish. My attention being thus directed to the 

 rarity of males, I followed up the matter during my sweeping work 

 in the summer of 1916, noting in each sweeping the number and sex 

 of the Lonchopteras. iVt the end of the season I had counted 

 2,652 specimens, all females, not a single male appearing. Most 

 of these were taken in northern Indiana, but many were from other 

 parts of the United States, and a few from Ontario. 



In this connection should be mentioned INIr. Lundbeck's treatise 

 on Lonchoptera in his beautiful series called Diptera Danica, v, 

 1-18, 1916. He recognizes in Denmark three species, — tristis, 

 lutea and furcata. He says nothing about any rarity of males in 

 the first two, but in furcata he says he has not seen the male, and 

 only about six are known in collections, while the female is common. 

 This is a parallel case, if in fact we do not have the same species, as 

 I believe we do. 



(e) The common leaf-miner Agromyza pusilla has many host- 



