118 MONOGRAPHIA 



8. NIRMUS MARGINALIS. (Louse of the Fieldfare.) 



Plate VIII. Fig. 2. 



Pale fulvous, shining and smooth ; head cordate, with a 

 large angular spot on each side ; posterior margin of the 

 metathorax acutely angular ; lateral margin of the abdo- 

 men with a narrow fuscous band 



NirmiiB marginalis. Burmeister Handbuch ii. pt. ii. p. 431. sp. 27. 



Head large and cordate, bright fulvous yellow, anterior 

 lateral margin, with two large acutely angular chestnut 

 patches, terminating in impressed lines at the occiput; 

 antennae slender ; trabeculae very small ; prothorax small, 

 transverse, lateral margin rotundate, deep chestnut ; meta- 

 thorax sub-triangular, the superior margin rotundate, with 

 a deep chestnut lateral spot, posterior angles acute ; abdo- 

 men subclavate, centre pale yellow, lateral margin pale 

 fulvous, each segment, except the last two, with a narrow 

 fuscous band ; legs thick, pale yellow ; anterior femora 

 enlarged ; tibiae banded with black. Length f . 



Communicated from the Fieldfare (Turdus pilaris) and 

 Missel Thrush (Turdus viscivorus) by the Rev. L. Jenyns, 

 from the Ring Ouzel (Turdus torquatus) by Henry Double- 

 day, Esq. of Epping, from which bird I have also taken 

 specimens myself. 



* * Head oblong and rotundate. 



9. NIRMUS FUSCUS ? 



Plate IX. Fig. 8. 



Testaceous, shining, and pubescent, with a dark fuscous 

 margin ; abdomen with a broad, dorsal, interrupted, fuscous 

 baud ; femora with a fuscous spot. 



Nirmus fuscus? Nitzsch. MSS. Nirmus discocephalus ? Lynet, Mern. 

 duMuse. torn. 18. plate 12. fig. 8. 



