100 INSECUTOR INSCITIJS; MENSTRUUS 



TWO NEW CULEX FROM COSTA RICA 



(Dipt era, Culicidce) 



By HARRISON G. DYAR 



Culex (Choeroporpa) pasadaemon, new species. 



The adult does not differ in coloration from C. dysmathes 

 D. & L., of which a long description has been published (Ins. 

 Ins. Mens., ix, 47, 1921). The structure of the side pieces, 

 clasper and lobes of the male hypopygium is also the same; 

 but in the basal parts the mesosomal plate has a more sharply 

 rounded and smooth projection, while the basal hooks are 

 broadly spatulate, not curled. 



Type, male, paratypes male and two females. No. 24083, 

 U. S. Nat. Mus. ; San Jose, Costa Rica, January 5, 1921 

 (A. Alfaro). 



This may be a local form of dysmathes from Panama. The 

 larvae of the two remain to be compared. 



Culex (Choeroporpa) merodaemon, new species. 



Coloration of pasadaemon, dysmathes, holoneus, alfaroi, 

 etc. The male hypopygium has the structure of that of 

 pasadaem^on, except that the mesosomal plate has a long at- 

 tenuated termination without marginal expansion. The basal 

 hooks are spatulate and not curled. 



Thirty-two specimens, type No. 24082, U. S. Nat. Mus.;' 

 Orotina, Costa Rica, December 20, 1920 (A. Alfaro). 



The structure differs perceptibly from that of pasadaemon, 

 which occurs in the same country. The distribution of these 

 peculiar little mosquitoes must be quite restricted, as each 

 locality gives different forms, although the distance may not 

 be very great. 



Date of publication, February 28, 1921. 



