Art. 23 GENUS CYLINDROMYIA MEIGEX ALDEICII 13 



The fifth sternite (so retracted that it is usually invisible without 

 spreading) has a narrow notch in the middle. The posterior forceps 

 in the male are united, brown in color, rather short and of equal 

 width in profile, with a minute apical tooth on the anterior side. 

 The anterior forceps are shining brown, considerably longer, 

 straight, and at the tip broadly curved forward to a rather sharp 

 point. The lateral margin of the last genital segment forms a 

 slender almost fingerlike small yellow process on each side. In the 

 female the last genital segment is reddish toward the apex with a 

 broad terminal opening, on each side of which a strong hook curves 

 forward and upward, but not situated so as to form a deep notch 

 with the body of the segment. The ventral side of the abdomen is 

 smooth and regular without cluster of spines. The front tarsi of 

 the female are noticeably elongated and flattened, the same also in 

 the European specimen. 



Length, 8 to 10.5 mm. 



Described from 97 specimens, of both sexes, besides a nuile and 

 female from Euroj^e (Bezzi). 



In the National Museum: Edwall, Fishtrap Lake, and Pullman, 

 Washington; Moscow and Lewiston, Idaho; Lafayette, Indiana (all 

 the preceding collected by Aldrich) ; Peaceful Valley, Colorado 

 (Cockereil) : Louisville, Colorado (M. H. Perkins) ; Bonaparte 

 Lake, Okanogan County, Washington, and Bead Lake, Newport, 

 Washington (Lane) ; Priest Lake, Idaho (Piper) ; Reno, Nevada 

 (Wickham) ; Elkhorn Mountains, Montana (INIann) ; Shields River, 

 Montana (Hunter) ; Eagle Creek, Oregon (Melander) ; Kaslo, Brit- 

 ish Columbia (Osburn) ; Beach, North Dakota (Ainslie) ; Denver, 

 Colorado (Dyar and Caudell) ; Owl Creek Mountains, Wyoming 

 (Currie) ; Walnut Creek, California (Davidson) ; Claremont, Cali- 

 fornia (Baker) ; Pasadena, California (Grinnell) ; Koehler, New 

 Mexico (Walton); Texas (Belfrage). 



In the Canadian National Collection: Sudbury, Ontario, July 7, 

 1889; Lethbridge, Alberta (Seamans, Strickland); Aweme, Mani- 

 toba (Vroom, Robertson) ; Fort Wrigley, McKenzie River (C. H. 

 Crickmay) ; Waterton Lakes, Alberta (McDunnough) ; Osoyoos, 

 British Columbia (Garrett) ; Lillooet, British Columbia. 



In Kansas University: Washington Territory; California 

 (Baron) ; Estes Park, Colorado (Snow) ; Clark County, Kansas 

 (Snow) ; Reno, Nevada (Hillman) ; Douglas County, Kansas 

 (Snow) ; Ellis County, Kansas (Williams) ; Johnson County, Kan- 

 sas (Beamer). 



In Professor Icelander's collection : Pullman, Washington ; Mount 

 Moscow and Priest Lake, Idaho; Eagle Creek, Oregon (all pre- 

 ceding collected by Melander) ; Almota, Washington (Yothers) ; 

 Torrey's Lake, Wyoming, September 7, 1895 (A^Hieeler). 



