ANOPLURORUM BRITANNIA. 213 



7. COLPOCEPHALUM suB^QUALE. (Louse of the Rook.) 



Plate XVIII. Fig. 5. 



Obscure, testaceous-yellow ; metathorax very large, with 

 a broad black fascia at the base ; abdomen with fuscous 

 bands. 



Colpocephalum subsequale. Nitzsch. Germ. Mag. iii. p. 299. Steph. Cat. 

 pt. ii p. 333. Burmeister Handbuch ii. pt. ii. p. 438. Children's 

 Appen. to Back's Land Expe. p. 539. spe. 10. 



Head sub-panduriform, with two black angular spots in 

 front, a large orbital patch on each side, and a narrow mar- 

 ginal band, vertex depressed, occiput concave ; eyes pro- 

 minent ; antennae pale, fulvous yellow ; prothorax sub-orbi- 

 cular, with a narrow black lateral margin, anterior part 

 with a transverse depressed line, base ciliated ; mesothorax 

 very small, sinuated behind ; metathorax large, sub-conical, 

 yellowish ash, base rotundate, with a broad black transverse 

 band, lateral angles acute ; abdomen oval, depressed down 

 the centre, each segment with a broad fuscous transverse 

 fascia, and sutures pale ; legs thick and strong, fuscous; the 

 anterior femora sub-angular. Length to f . 



This species is a common parasite upon the Rook (Corvus 

 frugilegus), and sometimes swarm to a degree scarcely cre- 

 dible, and no doubt in some instances occasions the death 

 of the individual. The Rev. L. Jenyns tells me his speci- 

 mens were taken from a Rook which was picked up in a 

 dying state, and swarming with these insects ; Mr. Thomp- 

 son found the same species on the Carrion Crow (Corvus 

 corone), and the Raven (Corvus corax) at Belfast. 



8. COLPOCEPHALUM EURYSTERNUM. (Louse of the 

 Magpie.) 



Plate XVIII. Fig. 6. 



Obscure testaceous, yellowand shining; abdomen with the 

 sutures pale ; legs thick, dull chestnut, variable in shape. 



