208 MONOGRAPHIA 



small orifices mentioned, it would appear that this species 

 of Colpocephalum at least seeks a place of shelter when 

 about to undergo so important a change as the shedding of 

 its entire skin, similar to what we know takes place with 

 Crustaceans. I alluded before to the circumstance that 

 certain genera or species of Nirmi appear to have favourite 

 locations on the animals they infest. The specimen of 

 the Golden Eagle from which I obtained the Lipeurus 

 A-pustulatus and Docophorus aquilinis, I also obtained 

 the present species ; each however seemed to prefer a dis- 

 tinct part, at which head quarters were held, for while the 

 first, as I have said, were packed close side by side upon 

 the mid rib of the large feathers of the wings and tail, the 

 second prefered the head and that part of the body covered 

 by the wings ; the third, the C. flavescens^ were congregated 

 in numbers at the extreme base of the quills of the prima- 

 ries and secondaries, among the fine down which protects 

 the insertion of the quills. 



2. COLPOCEPHALUM FREGILI. Denny. (Louse of the 

 Cornish Chough.) 



Plate XX. Fig. 4. 



Head bright chestnut-yellow, with black orbital spots ; 

 thorax deep chestnut; abdomen pale fulvous, lateral margin 

 pitchy ; femora of the second and third pairs of legs notched 

 near the apex. 



Head sub-panduriform; clypeus rotundate, entire,with two 

 deep chestnut angular spots on the anterior margin, orbital 

 depression very deep, with a large black spot united by a 

 chestnut band to a narrow black facia at the occiput, temporal 

 margin large, rotundate, and convex, base truncate andcon- 

 cave; eyes prominent; antennae with the first joint large co- 

 nical, second very slender and cylindrical, third cup-shaped, 



