138 MONOGRAPHIA 



chestnut; abdomen with broad dull testaceous, lateral 

 fascia; legs fulvous. 



Head oblong conical, clypeus rotundate, a broad chest- 

 nut sinuated band on each side before the antennae, a 

 transverse line across the vertex, which is concave, temporal 

 angles sub-rotundate, occiput truncate ; antennae slender 

 filiform, pale yellow ; trabeculae minute ; prothorax small, 

 transverse, and rotundate ; metathorax transversely trian- 

 gular, anterior margin rotundate, lateral margins rectan- 

 gular ; abdomen sub-elliptical, pale, yellow- white, the first 

 six segments with a broad, testaceous, lateral margin, shad- 

 ing into black externally, last three segments wholly tes- 

 taceous, sutures of the first three sub -angular ; legs pale 

 fulvous, the femora rather thick. Length f . 



The first specimen of this species 1 examined was for- 

 warded from Twizell House by P. J. Selby, Esq. who took 

 it upon the Razor- Bill (Alca torda), since which I have 

 obtained more examples myself from the same species of 

 bird. 



37. NIRMUS (EDICNEMI. Denny. (Louse of the 

 Common Thick-Knee.) 



Plate VII. Fig. 8. 



Pale testaceous-yellow, shining, and pubescent; head 

 large, sub-conical, lateral margin chestnut; antennae very 

 short and thick ; legs thick. 



Head large, elongate, sub -conical, clypeus slightly sinu- 

 ate, with an oblong depression in front, united to a semi- 

 circular transverse line, a sigmoid depression on each side 

 united on the vertex, and two longitudinal lines to the 

 occiput, base truncate ; antennae very short, thick, and 

 conical ; trabeculae short, very thick ; prothorax transverse ; 



