2l8 RKSEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 



c/iiis, in Plorida, and others obtained by Dr. E. Coues from the same 

 bird, on the Red River, near Pembina, Dakota. Dr. Coues, in his 

 " Birds of the North\ve.st,"' U. S. Geol. Surv., 1874, 587, says of the 

 White Pelican: " I took a female in very poor flesh, with worn, 

 harsh plumage, which was attributable to a disease of the pouch. 

 On the inside of this organ was fastened, in patches, great numbers 

 of a louse, which produced an induration, ulceration, and finally 

 perforation of the membrane. ' ' 



The characters of Moiopon pcrale as drawn from his original manu- 

 script are as follows : Head wider than long, transverse reniform, 

 pale brown, with a darker patch and acrescentoid black spot between 

 the clypeus and temple, fringed in front with short hairs, with a 

 longer tuft at the posterior lateral lobe, and a row of eight along the 

 posterior concave border. Antennae concealed beneath the head, 

 with the terminal joint largest and oval. Maxillary palpi cylin- 

 drical, reaching to the lateral border of the head, four jointed. 

 Mandibles strong, deeply two-toothed, black. Eyes two, close to- 

 gether on each side of the lateral border of the head. Prothorax 

 narrower than the head, rounded hexagonal in outline and produced 

 laterally in a strong conical point, pale brown above, with a darker 

 band crossing the middle and darker at the lateral borders, smooth. 

 Metathorax as wide as the head, bell-shaped in outline, with lateral 

 rounded angles : crossed by a row of hairs. Limbs well produced : 

 anterior femora .short and robust ; the posterior two nearly twice as 

 long as the former and darker brown in color. Tibiae with a spur at 

 the distal extremit}'. Tarsus with an ovate appendage at the prox- 

 imal extremit}^, and a single hair at the distal extremity. Ungues 

 strong, black. Abdomen long elliptical, nearly twice the length of 

 the head and thorax, and widest at the fourth segment. Segments 

 of nearly equal length, the last one mammiliform, all with a wide 

 chestnut brown band, and a row of short hairs emanating from clear 

 circular bases. Last segment with an additional tuft of hairs on 

 each side. 



Entire length 2^ lines ; color translucent whitish and transversely 

 striped with chestnut brown. Smaller individuals paler in color, 

 with narrower stripes of brown. 



In an individual 4.75 mm. long, the head was 0.75 long and i nmi. 

 broad ; the prothorax 0.55 long and 0.825 broad ; the metathorax 

 0.625 long and i mm. broad ; the abdomen 2.875 long and 1.25 mm. 

 broad. 



Attached singly or in groups up to fifteen or more between the 

 olds of the lining membrane of the pouch of Piiicaniis tyachyrhy)ichus. 



