682 MOSQUITOES OF NORTH AMERICA 



those along the banks of streams caused by overflows of high water, and are 

 often full of mud and leaves. They also inhabit general woods-pools, but 

 seldom occur so abundantly in such places. The open, often alga-filled pools, 

 frequented by Aedes abfitchii and fitchii, are not favored by this species. In 

 Newark, New Jersey, Professor Smith records larvge collected in March and 

 April, the first adult April 6. At Morristown, a more wooded locality, the first 

 adults appeared May 3. Mr. Brakeley did not find the species at Lahaway, nor 

 does it occur anywhere in the pine belt to Professor Smith's knowledge. The 

 larvae generally occurred associated with Aedes canadensis, which predominated, 

 as would be expected in woodland pools, where the collections were made. Pro- 

 fessor Smith remarks that the larvse favor the deeper pools and feed and hide 

 among the dead leaves covering the bottom. Professor Smith informed us that 

 he has observed a partial rotation of species in certain pools that he had yearly 

 under observation. In some seasons this species has occurred rarely in the pools, 

 but other species in abundance, while in other years the proportions are reversed. 



Northeastern North America. 



West Springfield, Massachusetts, larvse April 13, 1905 (P. Knab) ; foot of 

 Mount liolyoke, Massachusetts, larvse April 15, 1905 (Dyar and Knab) ; 

 Plattsburg, New York, larva April 24, 1905 (H. G. Dyar) ; Oxbow, Saskatche- 

 wan, larvse June 7, 1907 (F. Knab). Also reported from New Jersey (Smith) 

 and originally from Nova Scotia (Walker). 



We are able to cite only those localities where this species has been bred, as 

 the female adults are indistinguishable from those of ahfitcltU and fitchii. The 

 male genitalia serve for diagnosis, but males are seldom taken, unless bred, and 

 in the latter case the species is distinguishable also by the larvse. Unquestion- 

 ably we have here three good species formerly considered identical, as they 

 differ obviously in the structures of the larva and the male genitalia. But it is 

 unfortunate that the females of the three species are so far not differentiable. 

 Mr. Theobald has apparently separated them, and gives figures illustrating the 

 difi^erences in thoracic ornamentation which he has found in single specimens of 

 the three species, furnished by us for comparison with Walker's types. His 

 differentiation, made upon such slight material, disregards the variation which 

 occurs and which vitiates the characters which he adduces. The specimens 

 were sent to him for purpose of comparison, and not as representing the species 

 in their range of variation. We have series of the three species, bred from 

 carefully identified larvae, which show such a range of variation in each species 

 that no coloration character can be considered as diagnostic. Aedes stimulans 

 does not seem to be represented in the far West by an allied form, as abfitchii 

 is. Walker's stimulans is unrecognizable, being based upon adults only, and 

 may represent still another, as yet unrecognized species. Dyar applied the name 

 to abfitchii, as the most abundant and widely distributed species of the group, 

 but Speiser's previous restriction of stimulans to the present form must be 

 followed. Culex stimulans has been reported from Vera Cruz, Mexico, by 

 Parker, Beyer and Pothier (Yellow Fever Inst., U. S. Publ. Health & Marine 

 Hosp. Serv., Bull. 13, 37, 39, 1903), but we are sure that a misidentification has 

 been made; most likely the specimens were actually Aedes tceniorhynchu^ or 

 rubbed Aedes calopu^s. 



AEDES FITCHII (Felt & Young) Dyar & Knab. 



Culex cantans Johannsen (not Meigen), Bull. 68, N. Y. State Mus., 419, 1903. 



Culex cantans (no. 2) Dyar & Knab (not Meigen), Proc. Ent. Soc. Wash., vi, 143, 1904. 



Culex fitchii Felt & Young, Science, n. s., xx, 312, 1904. 



Culex fitchii Felt, Bull. 79, N. Y. State Mus., 281, 1904. 



Culicada fitchii Felt, Bull. 79, N. Y. State Mus.. 391c, 1904. 



Culex fitchii Dyar, Journ. N. Y. Ent. Soc, xii, 246, 1904. 



