ZooL.— Vol.. III.] KELLOGG— NET-WINGED MIDGES. 221 



With additional species and a widened distribution of 

 old forms known, the classification can be revised and 

 satisfactorily founded. 



The life-history of no Blepharocerid species is fully 

 known; the first eggs of any species are yet to be found; 

 the food-habits of the males are unknown; a host of 

 observations on the habits are to be made. 



No one has studied the "secondary venation," the creasing 

 of the wings. Are these lines of folding uniform in the 

 species, genus, family? Are there classificatory characters 

 to be derived from them? What is the significance of the 

 little chitinous thickening or knot in the re-entrant angle of 

 the anal margin of the wing? 



Do the well developed and plainly differing external 

 genitalia, especially those of the males, offer characters 

 which can be used in classification? The writer is prac- 

 tically sure of this, and would have attempted to use them 

 in the descriptions and analytical tables, only that nothing 

 was known about them in the North American species 

 previously described, and not yet seen by him. 



Note. — The writer may add that he should like to have 

 the opportunity to do some of this needed work, and to that 

 end will be grateful for any sending of specimens, with full 

 data, of larvae, pupse, or imagines of any species of Bleph- 

 arocerid. 



Stanford University, 

 California, 



November, 1902. 



