DIPTERA OF MINNESOTA. 119 



RIIOPALOMERIDAE. 



This very rare and little known family probably does not occur 

 in North America, though Williston, in Bntomological Nczvs, Vol.. 

 VII, page 185, reports a genus belonging to this family from this 

 country. Aldrich, in his "North American Diptera" (1904), gives 

 three species, but one is from Yucatan and two others from Mexico. 

 Members of the family probably frequent damp places in regions 

 where they are found. 



HELOMYZIDAE. 



Fig. 115. Leria pubescens. Original. 



Specimens of this family in our collection are dark colored, measur- 

 ing about one-half inch in length. We have found the following in 

 Minnesota. Leria pubescens, Loew. ; L. serrata, Linn. 



Larvae have been reared from bat and rabbit dung, and one species 

 from decaying wood. Some maggots are found under the bark of 

 trees. Some species of this family are said to live in burrows. 



Aldrich gives forty North American species, coming from Hudson 

 Bay, Nova Scotia, White Mountains, Mexico, California, Missouri 

 River, Montreal, etc. 



HETERONEURIDAE. 



No representatives in Minnesota, as far as known to the writer. 

 The larvae are found in decaying wood, under the bark of trees, 

 etc. They, like cheese skippers, have the power of leaping. 



