ANOPLURORUM BRITANNIA. 121 



thorax transverse ; metathorax much darker, posterior mar- 

 gin acutely produced in the centre ; abdomen oblong, sub- 

 claviform, with obscure transverse dorsal bands ; legs rather 

 slender, pale fulvous. Length f . 



I have found this species on the Cuckow (Cuculus 

 canorus), and received specimens of W. M. Tweedy, Esq. 

 of Truro, taken off the same bird, which I at first supposed 

 to be Dr. Burmeister's N. latirostiis^ but as all examples 

 I have seen are without the black spots on the abdomen, 

 which Dr. B. gives in his specific character of that species, 

 I have ventured to constitute this as a new species. 



12. NIRMUS TESSELLATUS. Denny. (Louse of the 

 Bittern.) 



Plate VII. Fig. 2. 



Pale yellow-white ; margin black ; head panduriform ; 

 abdomen with a double row of quadrangular pale fuscous 

 spots. 



Head panduriform ; clypeus rotundate, the exterior mar- 

 gin blackish, the anterior dull ferruginous, base truncate ; 

 antennae short, thick, and subclavate, the second joint the 

 longest and obconical ; eyes prominent ; prothorax narrow, 

 sub-quadrangular, slightly channelled in the centre ; meta- 

 thorax ochraceous, as wide as the head, much produced 

 behind with a small fasciculus of hairs from each lateral 

 angle, and a bi-furcated fuscous band on the lateral mar- 

 gin ; abdomen lanceolate, each segment, excepting the last, 

 with a black marginal band, and two pale fuscous qua- 

 drangular spots in the centre ; legs pale yellow-brown, 

 rather thick; the anterior femora enlarged and sub-trian- 

 gular, with the superior margin reflected. Length J. 



I have seen but a single specimen of this species, which 



