68 NORTH AMERICAN DIPTERA 



of food. The pupje are found in the bottom of the stream between 

 stones, etc. 



The following key will separate the described genera, tw^o of which 

 occur in America. The family has been revised by Edwards.* 



KEY TO GENERA 



1. Subcostal vein ending in the costa or first vein 2 



Subcostal vein obsolete apically, ending free. (North America, pluvialis 



Dyar & Shannon) Trichothaumalea Edwards 



2. Subcostal vein ending in the first vein, very short (Australia, N. Zea- 



land, S. America) Austrothaumalea Tonnoir 



Subcoastal vein ending in the costa 3 



3. Basal segment of c palpi greatly swollen, the second and third segments 



not much longer than broad; subcosta weak apically (Europe). 



Androprosopa Mile 

 Palpi rather stout, alike in both sexes, somewhat longer than the an- 

 tennas (N. America, Europe) Thaumalea Ruthe 



North American Species of Thaumalea 



1. Thorax and abdomen brown or blackish 2 



Thorax reddish yellow, the abdomen brown elnora Dyar & Shannon 



2, Male clasper with two terminal claws americana Bezzi 



Male clasper with about six terminal claws johannis Dyar & Shannon 



* Edwards, 1929. Zool. Anzeiger, pp. 121-142. 



