ANOPLURORUM BRITANNIJE. 125 



first segment acutely angular, of the fifth, sixth, and seventh 

 semicircular, last segment very small, stigmatic orifices 

 large ; legs thick and strong. Length f . 



Found on the Missel Thrush (Turdus viscivorus), by 

 Rev. L. Jenyns in Cambridgeshire, Mr. G. R. Denny in 

 Norfolk, and by myself in Yorkshire. 



17. NIRMUS FULIC^. Denny. (Louse of the Coot.) 



Plate IX. Fig. 2. 



Short, pale testaceous yellow, shining and smooth, lateral 

 margin fulvous; clypeus with a broad chestnut margin. 



Head large, sub-rotundate ; clypeus produced, with the 

 lateral margin chestnut, base broad, occiput with a trans- 

 verse chestnut fascia, each temporal lobe bearing a long 

 stiff hair; eyes prominent; antennae short, pale yellow, 

 placed in a sinus of the lateral margin ; prothorax trans- 

 verse, broader behind than in front, posterior margin rotun- 

 date ; metathorax the width of the head, lateral margin 

 rotundate, posterior much produced and acute, strongly 

 cilia te ; abdomen short and oval, the lateral margin ful- 

 vous ; legs thick ; femur broad, pale yeUow. Length . 



Found on the Coot (Fulica atra). I should have consi- 

 dered this species the Nirmus minutus of Nitzsch, which 

 infests the Coot, but he refers to fig. 3. in plate IV. of Redi, 

 which is certainly not our Insect, but rather I should have 

 supposed a Docophorus ? 



* * * Head sub-triangular or sub-conical. 



18. NIRMUS DECIPIENS. (Louse of the Avocett.) 



Plate 1 1. Fig. 2. 



Testaceous, smooth, and shining, slightly pubescent; 

 lateral margin of the thorax and abdomen deep fuscous ; 

 head and prothorax dull chestnut. 



