ANOPLURORUM BRITANNIA. 215 



tennse obscure ; prothorax narrower than the head, sub- 

 elliptical, with a transverse depressed line in the centre; 

 mesothorax very small and narrow ; metathorax semicir- 

 cular; abdomen clavi form, deep pitch-colour, sutural margins 

 paler; legs chestnut, long, and slender, anterior femora 

 sub-angular, margin involute ; tibiae clavate, densely ci- 

 liated on the exterior margin; posterior tarsi very long. 

 Length 1. 



Not uncommon upon the Heron (Ardea cinerea) ; young 

 specimens are of a fine chestnut. 



10. COLPOCEPHALUM NYCTARDE. Denny. (Louse of the 

 Night-Heron.) 

 Plate XX. Fig. 9. 



Deep chestnut, shining and smooth ; head large, obtusely 

 pyramidal, with two black orbital patches ; abdomen short, 

 obtusely ovate. 



Head and prothorax bright chestnut, the former very 

 broad at the base, obtusely pyramidal with a large black 

 quadrangular orbital spot on each side ; clypeus transverse, 

 with two deep brown spots on the anterior margin, and three 

 at the occiput, lateral margin deeply sinuate, with a few 

 long hairs ; eyes prominent ; prothorax sub-rhomboidal, la- 

 teral angles acute, a transverse impressed line across the cen- 

 tre, from which proceeds a short longitudinal one; mesothorax 

 very short; metathorax nearly as wide as the head, transverse; 

 abdomen broad, ovate, deep chestnut, rather paler down 

 the centre, the last two segments fulvous ; legs pale chestnut, 

 thick, and strong ; tibiae abruptly clavate. Length \ to f . 



The only examples of this species which I have seen, I 

 found beneath the wing of a young Night-Heron (Ardea 

 Nycticorax). 



