INSECUTOR INSCITI^ MENSTRUUS 19 



Culex usquatus Dyar. 



Shown in figure 2. I have referred this as a variety of 

 coronator, but it would seem rather to run into ousqua, judging 

 by the transitional specimen from Venezuela, figured in 

 figure 3. 



Culex ousqua Dyar. 



Shown in figure 4. The multiplication of hairs on the basal 

 side of the rods is intensified, while the outer part of the 

 lobe is reduced and constricted. The setae at apex of lobe are 

 short again as in coronator, being long in usquatus and inter- 

 mediate in the transitional form. 



Culex usquatissimus, new form. 



Shown in figure 5. The apical hairs are long; rods of the 

 lobe without accompanying hairs, the outer group reduced to 

 three heavy blackish blade-shaped structures. The adults have 

 the white markings reduced, tarsi with only very narrow white 

 rings, though the male retains the small white band on the 

 proboscis. 



Types, male and female. No. 25147, U. S. Nat. Mus. ; Toro 

 Point, Canal Zone, Panama, October 27, 1921 (J. B. Shrop- 

 shire). 



AN UNDESCRIBED SPECIES OF DIXA FROM 

 NEW ZEALAND 



(Diptera, Divides) 



By CHARLES P. ALEXANDER 



The family Dixidae includes the single genus Dixa Meigen. 

 Many students of the Culicidse place these flies in this family 

 as the subfamily Dixinse. The writer is not entirely convinced 

 that Dixa is not deserving of full family rank and it is so con- 

 sidered in the present paper. Up to date, 36 species of these 

 flies have been described, distributed in the following regions : 

 Palaearctic, 20 species, including 3 described within the past 

 year by Edwards and Seguy ; Nearctic, 7 species ; Neotropical, 



