ANOPLURORUM BRITANNIA. 123 



before the antennae, extending to, and uniting at, the 

 occiput ; trabeculae small and acute ; antennae very slender, 

 filiform, the first joint the largest arid conical, the second 

 the longest, the third and fourth with a fulvous band ; pro- 

 thorax narrower than the head, transverse ; metathorax 

 transversely conical, posterior margin slightly produced in 

 the centre ; abdomen oblong, sub-claviform, segments ful- 

 vous, sutural margins pale ; legs pale yellow, rather stout ; 

 ungues chestnut. Length f ] . 



I am again indebted to the friendship of Dr. Burmeister 

 for the opportunity of figuring this species, of which I in 

 vain sought for a British specimen, owing to the rarity of 

 the Roller (Coracias garrula) in this country. 



15. NIRMUS ARGULUS. (Louse of the Rook.) 

 Plate VI 1 1. Fig. 4. 



Elongate ; head and thorax testaceous ; transverse fasciae 

 on the abdomen marked with two united white spots on 

 each side ; antennae and tibiae with fuscous annuli. 



Nirmus argulus. Nitzsch. Germ. Mag. iii. p. 291. Steph. Cat. pt. ii. p. 

 331. spe. 5. Burmeister Handbuch ii. pt. ii. p. 430. spe. 24. 



Head sub-cordate ; clypeus with a deep pitchy margin, 

 a depressed diagonal line on each side from the base of the 

 antennae uniting on the vertex, base truncate, each tem- 

 poral lobe bearing a long stiff hair ; eyes prominent ; 

 antennae pale yellow, long, sub-filiform, the first joint large, 

 the second, third, and fourth, with a broad fuscous band ; 

 trabeculee very small, acute ; prothorax testaceous yellow, 

 small, and quadrangular ; metathorax transverse, wider than 

 the head, posteriorly somewhat angular, produced in the 

 centre, lateral margin with a broad pitchy band ; abdomen 

 oblong, pale testaceous yellow, the first eight segments 



