310 THE CANADIAN ENTOMOLOGIST 



A NEW NORTH AMERICAN SPECIES OF ANTHOMYIID.E 



(DIPTERA). 



BY J. R. MALLOCH, URBANA, ILL. 



Among some Diptera recently received from Mr. C. W. 

 Johnson I have found several very interesting forms, some of 

 which are evidently undescribed. One of the most striking forms 

 is the one described herewith, which is also represented in material 

 in my hands belonging to the U. S. Bureau of Biological Survey. 



Hylemyia pluvialis, n. sp. 



Male. — Black, covered with dense gray pruinescence. An- 

 tennae and palpi black; orbits and face with silvery pruinescence. 

 Thorax not vittate. Abdomen with an interrupted dorso-central 

 black stripe, which is slightly dilated at anterior margin of each 

 segment. Legs . black, tibiae entirely or in large part rufous. 

 Wings clear. 



Eyes separated by less than distance across posterior ocelli; 

 arista with the longest hairs about twice as long as basal diameter 

 of arista. Prealar bristle usually absent; 3 strong pairs of pre- 

 sutural acrostichals usually present; pleura with normal hairs and 

 bristles. Third dorsal abdominal segments with a truncate ex- 

 tension at posterior lateral angle; fifth sternite with broad pro- 

 cesses which extend almost to apex of abdomen and are armed 

 along outer margin with a fringe of long, slender bristles which are 

 directed downward and curve mesad at their apices. 



Fore tibia with one posterior bristle above middle; third and 

 fourth fore tarsal joints slightly dilated ; mid tibia with 1-2 antero- 

 dorsal and 2-3 postero-dorsal bristles; hind femur with 5-6 widely 

 spaced antero-ventral bristles, and 4-5 weak postero-ventral 

 setulose hairs on basal half; hind tibia with 3-5 antero-dorsal and 

 3 postero-dorsal bristles, and 5-6 antero-ventral, and 7-9 postero- 

 ventral setulose hairs. Third and fourth wing-Veins slighth' con- 

 vergent apically; costal thorn of moderate length. 



Length 5 mm. 



Type lodality. Gold Rock, Ont., Rainy River District, July 

 21 (H. H. Newcomb). 



Paratypes.— Estes Park, Moraine Park, altitude 7,500 feet, 

 Col. (E. C. Jackson.) 



September. 1918 



