512 PROCEEDINGS OF THE ACADEMY OF [Sept., 



(Shute); No. 9, d^, Dorchester, Suffolk Co., Mass., No. 482 (Uhler) 

 No. 10, d^, Eastport, Washington Co., Me., July 15 (Johnson) 

 No. 11, 9 , Barber Dam, New Brunswick, June 25, 1914 (McKenzie) 

 No. 12, d", Frederickton, New Bruns\vick, June 10, 1914 (Tothill) 

 No. 13, d^, British America (Scudcler); No. 14, c^, Colorado (H. K. 

 Morrison) . 



Paratype No. 6 bears the label "scaphula^' in Loew's script. 



The type and paratypes 1 to 5 are in the collection of the author; 

 the allotype and paratypes 6 to 9 and 13 in the Museum of Com- 

 parative Zoologj^; paratype 10 in the Boston Society of Natural 

 History; paratypes 11 and 12 in the New Brunswick Experiment 

 Station ; paratype 14 in the United States National Museum. 



This species is dedicated to my friend and companion, Mr. Howard 

 S. Parshley. 



Many specimens, including the type, were taken along the Penob- 

 scot River near the Basin Mills during the twilight and early evening. 

 The flies were on the wing and quite active. 



Explanation of Plates XVI-XXI. 



Plate XVI. — Wing- venation. 



Fig. .1. — Wing of Nephroioma penumbra; Ri, R2, Rz, etc. = radial veins; Mi, 

 Ml, Mi = medial veins; Cu2 = cubitus 2; 2nd A = second anal. 



