INSECUTOR INSCITI/E MENSTRUUS 173 



The dispersal of this species is rapid. On Jvine 13 the fe- 

 males were found in abundance in low land behind Tahoe 

 Tavern, not being in evidence elsewhere. By the 18th, they 

 had practically left this area and were well distributed through 

 the woods several miles distant. It is thought they had re- 

 cently emerged in the first location, although the marshy 

 ground had dried out. 



Additional data are as follows : Tahoe City, Placer County, 

 California, June 12-20, 1920 (H. G. Dyar) ; Gold Lake, Sierra 

 County, California, June 26, 1920 (H. G. Dyar); Camp El- 

 well, Plumas County, California, June 23-25, 1920 (H. G. 

 Dyar). 



A NEW CULEX FROM PANAMA 



(Dipfera, Culicidce) 

 By HARRISON G. DYAR 



Culex (Choeroporpa) psatharus, new species. 



Male. Head with flat black scales and many erect forked 

 ones ; a white border to the eyes below, narrowing above and 

 not attaining vertex. Mesonotum with dark brown narrow 

 curved scales. Abdomen entirely black scaled above and 

 below. Legs bronzy black, the femora paler below. Wings 

 narrow, the scales blackish, ovate, the first submarginal cell 

 very long, about three times its stem. Palpi exceeding the 

 proboscis by more than the length of the last joint, the last 

 two joints slender, sparsely hairy; palpi and proboscis dark 

 brown. 



Hypopygium. Side piece very broad at the base, narrow- 

 ing, slender on the outer third ; inner division of the lobe with 

 a large columnar stem, a little constricted in the middle, three 

 oblique transverse ridges forming a broken collar about the 

 tip, appendages equal, very stout, with hooked tips, inserted 

 almost together ; outer division of lobe twice cleft almost to 

 base, forming three pedicels, the outer bearing a group of 

 flattened filaments, the middle a blade-like filament, the inner 

 a long hooked filament and a short blade-like one beside it. 



