ANOPLURORUM BRITANNIA. 25 



LEGS formed for climbing, very thick, all nearly equal, in 

 other respects like those of Pediculus. 



Stirps I Abdomen with eight segments. 



1. HJEMATOPINUS ACANTHOPUS. (Louse of the Field 

 Campagnol.) 



Plate XXIV. Fig 3. 



Pale yellow ; head and thorax light ferruginous ; abdomen 

 with the lateral margin ferruginous, reflexed and spinulose; 

 apex of the posterior femur armed with a strong tooth. 



Pt'diculus acanthopus, Burmeister Genera Insectorurn. Order, Rhyn. sp. 

 />. tab. Gen. Phthirius, fig. 2. 



Pale yellow, shining and smooth, with a few hairs scat- 

 tered over the surface ; head ferruginous, subcordate, obtuse 

 in front, the lateral margin deeply sinuated behind the 

 antennae; occiput acuminate; eyes not visible; antennae short 

 and thick, the first joint very large, the second much the 

 largest. Thorax ferruginous about the length of the head 

 and subquadrate, depressed in the centre, lateral margins 

 elevated, anterior part notched to receive the occiput, base 

 slightly produced; abdomen large, elongate, ovate, the lateral 

 margin of the first six segments pale ferruginous, reflexed, 

 obliquely truncate and terminating in a spine ; legs thick, 

 the four anterior pale yellow, the two posterior ferruginous, 

 having the coxae armed with two minute teeth on the inner 

 side, the femur terminating at the superior extremity, with 

 a strong recurved tooth ; tibia clavate ; tarsus very large ; 

 unguis slender and acute. Length i. 



The first example of this species which came under my 

 notice was communicated by the Rev. L. Jenyns, from the 



