INSECUTOR INSCITI^ MENSTRUUS 175 



line. They frequent essentially temporary pools, of not too 

 transient a nature, such as are left in stream beds where the 

 rivers go dry in the summer or greatly diminish in volume. 

 These pools are without vegetation. The genitalia are essen- 

 tially as in tarsalis, the lobe of the side piece having three 

 rods, a seta, a leaf-like appendage and a seta ; the second plate 

 of the unci is modified in the same manner, but there are only 

 two teeth on the central portion. 



5. Culex (Culex) erythrothorax Dyar. 



Culex erythrothorax Howard, Dyar and Knab, 1. c, iii, 315, 1915. 



This species inhabits the southern part of California, south 

 of the San Bernardino-San Gabriel-Coast Ranges, the north- 

 ernmost record being Salinas. It has not been found in the 

 San Joaquin or Sacramento Valleys. The larvse live in 

 sloughs of permanent water among cat-tails and Lemna, the 

 water often of considerable depth and containing fish. The 

 larva is much as in pipiens and quinquefasciatus, but has a 

 longer air-tube and the subdorsal abdominal hairs are in threes. 

 The development is slow. The male genitalia have the lobe 

 of the side piece with three rods, subequal, a leaf-like append- 

 age, straight on one side, a stout seta beside it and a seta 

 bejond; the second plate of the unci has the lower arm tooth- 

 lilje, the upper arm similar, not membranous; between these 

 solne 8 teeth in two ranks, subequal, and a long horn from 

 the base, exceeding the teeth. 



(,;. Culex (Culex) salinarius Coquillett. 



Culex salinarius Howard, Dyar and Knab, 1. c, iii, .373, 1915. 



This ranges over the United States east of the Great Plains, 

 except the southern part, being absent from Florida and un- 

 recorded from the Gulf coast. It is commonest in open 

 marshes, especially near the sea, though it does not inhabit 

 salt marshes nor require even slightly saline water. The air- 

 tube of the larva is long and slender, the body glabrous. The 

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

 the marginal one a little shorter, but as stout as the others, a 



