114 INSECUTOR INSCITI^ MENSTRUUS 



Argentine region. The development is in the direction of 

 occupying drier and drier country, until a form is reached 

 (stigmatephora) with the characteristic piebald desert vestiture. 

 With us, no such development has taken place. The arid plains 

 of Montana, though teeming with mosquitoes after specially 

 heavy rains, every four years or so, possess no predaceous 

 species of mosquito. 



Psorophora ciliata Fabricius. 



Culex ciliata Fabricius, Ent. Syst., iv, 401, 1794. 

 Culex molcstus Wiedemann, Dipt. E|Xot., 7, 1821. 

 Culex rubidus Robineau-Desvoidy, Mem. Soc. Hist. Nat. Paris, 



iii, 404, 1827. 

 Psorophora boscii Robineau-Desvoidy, Mem. Soc. Hist. Nat. Paris, 



iii, 413, 1827. 

 Culex conterrens Walker, Ins. Saund., Dipt., 427, 1856. 



A diagram of the mesonotum is given in Plate IV, figure 1. 

 There are broad bare spaces corresponding to the usual paired 

 lines and posterior half -lines seen in Aedes, subgenus Ochle- 

 rotatus. There is a narrow central line of golden scales, sep- 

 arating the two long bare spaces. Near the middle on each 

 side is a narrow black spot, which is continued by a line of 

 black scales to the posterior border. All the sides and ante- 

 scutellar space are covered with light gray scales. 



Psorophora ctites Dyar. 



Psorophora ctites Dyar, Ins. Ins. Mens., vi, 126. 1918. 

 The mesonotal pattern seems to be identical with that of 

 ciliata. I therefore entertain some doubt as to the distinctness 

 of the species. No male has been examined as yet, although 

 the form turned up recently in a new locality, mixed with 

 normal ciliata. The new record is Augusta, Georgia, July 23, 

 1921 (S. F. Hildebrand). 



Psorophora tibialis Robineau-Desvoidy. 



Culex tibialis Robineau-Desvoidy. Mem. Soc. Hist. Nat. Paris, iii, 



404, 1827. 

 Culex perterrens Walker, Ins. Saund., Dipt., 431, 1856. 

 Psorophora lynchi Brethes, An. Mus. Nac. Hist. Nat. B. A., xxviii. 



204, 1916. 



