Dec, igoz.j C'arriker: New Mallophaga. 227 



My specimen measures: body, length 5.37 mm., width 1.8 mm.; 

 head, length 1.07 mm., width 1.50 mm. 



A single female collected from a whistling swan ( Olor columbianus') 

 shot at Nebraska City, Neb., Nov. 22, 1900. This specimen agrees 

 very closely, indeed, with the excellent description and plate which 

 Piaget gives, the only appreciable difference being in the slightly 

 smaller size. Although his figure could hardly be improved upon, a 

 drawing of my specimen is given for the benefit of those to whom 

 Piaget' s plate may not be available. 



Akidoproctus Piaget. 



The following is a somewhat condensed form of the generic de- 

 scription as given by Piaget : The clypeus of great width with an 

 indentation in the place of the signature of the Docophori ; clypeus not 

 distinct ; the antennal fossa shallow and not extending in front of the 

 trabeculae ; the antenuce almost uniform in the two sexes, short and 

 thick, the segments decreasing in size to the tip ; eye projecting, 

 without hairs,"'- the temples long, rounded behind, with some weak 

 bristles ; occipital bands distinct, parallel. 



The prothorax subquadrangular ; metathorax wider than the head 

 (except in marginatus'), acuminate on the abdomen ; the legs similar 

 to Nirnuis except greater length, especially of tibiae. 



Abdomen elongate -oval, naked except at the angles, with a large 

 transverse furrow between the segments and the bands separated by a 

 median, longitudinal, clear line ; the last two segments, sharply sepa- 

 rated from the seventh, form a small cone partly truncate or rounded 

 {$), pointed or rounded ( 9 ) ; the genital organs of both sexes 

 similar to Nirmus. The individuals are rarely met with and so far 

 only on palmipeds, except bifascialus which has probably straggled to 

 a D rami as ardeola. 



This genus has heretofore been found only in Europe and the find- 

 ing of specimens of it upon a Canvasback Duck {Aythya val/isneria), 

 at Lincoln, Neb., was quite a surprise. The specimens were col- 

 lected by J. C. Crawford, Jr., from a bird killed by J. S. Hunter, 

 and kindly turned over to me by Mr. Crawford for description. 



The first species of this genus recorded was described by Nitzsch 



* This statement is either an error or else not a generic character, because the 

 species which I have described has a very strong hair on the dorsal surface of tlie 

 eye. 



