174 INSECUTOR INSCITI^ MENSTRUUS 



Section CULEX Linnaeus 



2. Culex (Culex) corniger Theobald. 



Culex corniger Howard, Dyar and Knab, 1. c, iii, 240, 1915. 



This species reaches us only in southern Florida. It is a 

 well marked form, remarkably variable in coloration as adult, 

 yet with distinct and easily recognizable characters in larva 

 and male genitalia. The lobes of the side piece have three 

 rods, the central one very stout, followed by a leaf-like append- 

 age with a very delicate seta beside it and a seta beyond. 



The species ranges over the Antilles, Mexico, Central Amer- 

 ica and South America to Brazil, having essentially a tropical 

 distribution. 



3. Culex (Culex) tarsalis Coquillett. 



Culex tarsalis Howard, Dyar and Knab, 1. c, iii, 2.30, 1915. 

 This species is common throughout the west, especially in 

 the arid regions, and extends eastward as far as Illinois, dis- 

 appearing in the forested country and at high altitudes. The 

 larva has the air tube with five paired tufts, but the tufts are 

 crowded together on the ventral line, confused and alter- 

 nating, so that the normal position of the subapical tuft as out 

 of line with the others is obscured. The larvae may be found 

 in all sorts of stagnant water in the open, permanent or semi- 

 permanent, containing vegetation. The male genitalia have 

 the lobe of the side piece with three rods, the marginal one 

 shorter, a seta, a leaf-like appendage and another seta. The 

 second plate of the unci is curved, one arm membranous and 

 finely dentate on the inner side, the other arm tooth-like; on 

 the surface between these two arms are 4 to 6 teeth, more 

 or less irregular in size ; from the base of the plate arises a 

 single long horn, exceeding the central tooth in length. 



4. Culex (Culex) stigmatosoma Dyar. 



Culex stigmatosoma Howard, Dyar and Knab, 1. c, iii, 236, 1915. 



This species is confined to the Pacific coast region and has 

 not been found east of the Sierras. The larva has the air- 

 tube with five paired tufts, the subapical one moved out of 



