THE CANADIAN ENTOMOLOGIST. 57 



other two inhabit , according to our present information, the out- 

 skirts of the Prairie Province, canadensis being known from the 

 northern end of that province in Canada, and pallidipennis from 

 the eastern extension of the prairies in southern Wisconsin and 

 northern Illinois. Pallidipennis and bruneri, both of them oligo- 

 tropic bees of the Composita? favour the sunflowers (species of 

 Helianthus), and flowers of the same structural type, such as 

 Rudbeckia and Lepachys. 



Maura visits in Wisconsin Physalis, the same as in Nebraska. 



Citrinella and its Nebraskan representative per pallida are 

 both prairie-clover visitors, the former favouring the flowers of 

 Petalostemum villosnm, and the latter those of P. violaceum. 



In its type locality in the vicinity of Milwaukee, maculipennis 

 obtains its pollen from the white melilot, a species of Leguminosae 

 introduced from Europe. This means, of course, an adaptation 

 to new conditions brought about by the fact, that the native plant 

 or plants visited originally by this bee do not occur in the type 

 locality at the present time. In all probability the bee will be 

 found in some other part of its range at the flowers of some small- 

 flowered species of Leguminosae of the genera Petalostemum, 

 Amorpha or Lespedeza. 



While citrinella has remained true to a plant of the prairie 

 region (Petalostemum), gerhardi, a near relative of the former has 

 entered into relations with the horsemint (Monarda punctata), a 

 species of eastern distribution. 



PROSOPOTHRIPS COGNATUS, A NEW NORTH 

 AMERICAN THYSANOPTERON. 



BY J. DOUGLAS HOOD, 

 U. S. Biological Survey, Washington, D. C 



The genus Prosopothrips was erected by Uzel in 1895 for the 

 reception of a single Bohemian species of anomalous structure, to 

 which he gave the specific name vejdovskyi. The species is now 

 known only from females taken in Bohemia (Uzel), Finland 

 (Reuter), and Italy (Buffa). Consequently, the occurrence in 

 North America of what appears to be a second species of the 

 genus, and the discovery of the male, are matters worthy of 

 record, especially since Mr. E. O. G. Kelly, who collected the 



February. 1914 



