178 INSECUTOR INSCITI^ MENSTRUUS 



inal segments 3 and 4, these being double in pipiens. The 

 male genitalia have the lobe of the side piece with three rods, 

 of which the central one is slenderer, and not the marginal one 

 shorter, followed by two fine setae and a filamentous rod, a 

 leaf-like appendage and a seta. Harpes with a crown of 

 spines, the basal appendage short and straight ; unci of four 

 plates ; 1, triangular and strongly pigmented ; 2, curved, with 

 a longer and a shorter arm as in restuans, but thin and not 

 tooth-like; 3, long and flat, exceeding the other pieces and 

 curving to one side; 4, upright and straight, the pair joined 

 by a bridge. 



10. Culex (Culex) pipiens Linnaeus. 



Culex pipiens Howard, Dyar and Knab, 1. c, iii, 360, 1915. 



This species is a native of Europe, presumably introduced 

 into the United States by commerce. It is spread over the 

 northern part of the eastern region, from Virginia to New 

 Hampshire, westward to Illinois. The larvae are found in 

 artificial collections of water and also in the open in pools 

 that are sufficiently foul. The genitalia have the lobes of the 

 side piece with three rods, the marginal one stoutest, two setae 

 and a filament, a leaf-like appendage and another seta; the 

 unci have four plates; 1, triangular and pigmented; 2, concave, 

 short and broad, the angles rounded and scarcely produced; 

 3, long and flat, exceeding the other parts but slenderer than 

 in quinquefasciatus and often outbent angularly; 4, stout and 

 long, somewhat tubular with a truncated tip, outbent with the 

 other plates. 



What has been known as Culex comitatus Dyar and Knab 

 (Monog., iii, 369, 1915) inhabits the coastal area of California 

 and lower Sacramento Valley (Roseville). The differences 

 pointed out between it and pipiens are slight, and there seems 

 little doubt but that it is actually pipiens, independently intro- 

 duced into California by commerce during the last century. 

 In describing comitatus, all our comparisons were made with 

 quinquefasciatus and it never occurred to us to consider 

 pipiens specially in this connection. If it had, we would have 

 seen that a new name was unnecessary. 



