NORTH AMERICAN PARASITIC COPEPODS BELONGING TO 

 THE FAMILY CALIGID.E. 



PARTS 3 AND 4. A REVISION OF THE PANDARIN.E AND THE 



CECROPIN.E. 



By Charles Branch Wilson. 



Department <>/ Bi'oloytJ, State NoDiuil School, ]V(slJi.eld, ^klssachusetts. 



INTRODUCTORY. 



The present is the sixth paper in the series based upon the collec- 

 tion of the U. S. National Museum and finishes the family Caligidse. 

 For many reasons a large amount of careful and painstaking collating 

 has been rendered necessary before this paper could be published. 

 And in consequence, as its title indicates, it lias taken the nature of a 

 thorough revision of the two subfamilies which it includes. Such a 

 revision was found to be absolutely demanded for any intelligent 

 discussion of the group, and especially for its accurate systematization. 



In the first place, up to the present time we have been acquainted 

 with both sexes of but one or two species in the entire subfamily 

 Pandarina3. Of all tlie other forms either the male or the female 

 have been described alone. 



This has been due not to any scarcity of the missing sex, as might be 

 supposed, but to the fact that when found it was located elsewhere on 

 account of the great morphological dissimilarity between the sexes. 

 So that we find repeatedly the anomaly of a female classified under 

 one genus and subfamily, while the male is located under an entirely 

 dift'erent genus, and often in another subfamily. 



Furthermore, all previous attempts to bring together the sexually 

 separated species have been confined to individual cases or to closely 

 related forms. And there has been in these attempts such an utter 

 disregard of morphological and developmental data that they have 

 only served to render the confusion worse confounded. To the best 

 of the author's knowledge the present paper is the first to systematize 



Proceedings U. S. National Museum, Vol. XXXIII— No. 1573. 



3^3 



