88 INSECUTOR INSCITI^ MENSTRUUS 



probable that his male of Heteronycha was a male Culex, the 

 female being an Aedes, the two wrongly associated, just as 

 Brethes has subsequently done in the case of the same species. 

 Still, the only tangible differentiation between Culex and 

 Heteronycha is the toothed claws in the latter, and therefore 

 Heteronycha must be considered to be founded on the Aedes 

 element before Lynch. That this was the present species, 

 lynchii Brethes, seems to me probable by exclusion. All the 

 other common Aedes are specified by Lynch ; this one is 

 omitted. It is an abundant species, as the numerous females 

 before me testify. Males in this group are not commonly 

 taken unless bred, and one has to be fortunate to breed them, 

 for they pass through their transformations with surprising 

 rapidity in transient rain-puddles. Nevertheless the females 

 are common and conspicuous and the temptation is not always 

 resisted by students to associate with these common females 

 before them some males which they find likewise rather com- 

 mon. With rubbed specimens the markings will not seem 

 dissimilar. This is what I think has occurred in the case of 

 Lynch. It certainly did in the case of Brethes. If I am 

 right, the following synonymy will obtain and the name 

 Heteronycha will replace Ochlerotatus as a subgenus of Aedes: 



Aedes (Heteronycha) dolosa Lynch Arribalzaga. 



Heteronycha dolosa Lynch (in part, female only), Rev. Mus. de 



La Plata, ii, 156, 1891. 

 Culex lynchii Brethes, An. Mus. Nac. Hist. Nat. B. A., xxviii, 



212, 1916 (female; not Culex lynchii Brethes, male, cited 



above). 



Aedes albifasciatus Macquart. 



Sefior Brethes sends males, so that ! am able to make known 

 the genitalia of this interesting species. 



Male genitalia. Side pieces about three times as long as 

 wide, the tips conical ; apical lobe undififerentiated, probably 

 represented by a nude outer area ; basal lobe large, prominent, 

 subglobose, covered with fine but rather long hairs ; a group 

 of many stout set?e at the base, the innermost of which is the 



