VI MOSQUITOES OF NOETH AMERICA 



of certain species the descriptions of which covered a number of species and of 

 which the types were not recognizable. All species from our region, whether 

 recognized or not, are treated in the following text. 



The two of the present authors who have undertaken the preparation of the 

 systematic portion of the work have not had the opportunity to personally 

 examine the types in European collections, but have been obliged to rely upon 

 descriptions and examinations made by others. For this reason, and from lack 

 of adequate South American collections, we have not been able to recognize cer- 

 tain species described by Theobald from the Guianas and elsewhere, some of 

 which may prove to be the same as species subsequently described by us from 

 Trinidad or Panama. 



In the paper above referred to, by two of the present authors, a number of 

 species were described from the larvae only.^ With a few exceptions we have now 

 described the adults of these and placed them in our tables in their proper places. 

 Nearly all of them prove to be valid species, distinct from those previously 

 founded upon adults alone. 



In questions of priority and synonymy we have followed the code of the Inter- 

 national Zoological Congress as elaborated by Dr. C. W. Stiles. While some of 

 the changes in names have been adopted by us with reluctance, it has seemed 

 necessary to treat the subject consistently and to follow the latest authority. 



In questions of classification we have adopted the system suggested by our- 

 selves and have not followed the arbitrary systems based on the relative length 

 of the palpi in the two sexes and the scale characters proposed by Mr. F. V. 

 Theobald, nor the subdivisions into numerous subfamilies. 



A number of European species have been credited to the American fauna from 

 time to time, but all such cases that we have been able to investigate have 

 proven to be fallacious, the fact being that closely allied and representative 

 species inhabiting the separate continents have been mistaken for each other. 

 We have therefore excluded all European references except in the case of Culex 

 pipiens, which we have reason to believe has been actually introduced. 



The drawings contained in Volume II of this work, which illustrate the 

 present systematic portion, were prepared by the following artists : 



Plate 1 by Miss Mary Carmody, after Circular 72, U. S. Dept. Agr., Bur. Ent. 



Plates 3-40 by Miss Carmody from microscopic slides, except the enlarged 

 details on plates 17, 18 and 19, which are by Mr. Frederick Knab from Proc. 

 Ent. Soc. Wash., xi, plates i-iii, 1909. 



Plate 41 from photographs by Mr. H. S. Barber. 



Plates 42-85 by Mr. Knab from living larvae. 



Plates 86-131 by Mr. Knab, partly inked in by Miss Carmody. 



Plates 132-144 by Miss Carmody. 



Plate 145 by Mr. Knab. 



Plates 146-147 by Miss E. G. Mitchell. 



Plates 148-150 by Miss Mitchell, except figures 699 and 713, which are by 

 ]\[r. Knab. 



^The larvae of Culicidse classified as independent organisms. Journ. N. Y. Ent. Soc, xiv, 

 169-230, pis. 4-16, 1906. 



