120 MONOGRAPHIA 



terior margin tridentate ; abdomen obscurely banded ; head 

 with a ferruginous band on each side before the antennae. 



ISTirmus rufus ? Burmeister Handbuch ii. pt. ii. p. 430. spe. 20. Nirmus 

 Platyrhynchus ? Lyonet Mem. du Muse. torn. 18. pi. 13. fig. 4. 



Head sub-panduriform, with a ferruginous marginal patch 

 before the antennae, terminating in two curved impressed 

 lines united at the occiput ; antennae rather short, filiform, 

 the second joint much the longest; trabeculae short and 

 acute ; prothorax small, transverse, with a channel in the 

 centre ; metathorax sub-conical, lateral angles acute, centre 

 of the posterior margin produced ; abdomen oblong, sub- 

 claviform, with obscure transverse bands, sutural and lateral 

 margin sometimes much paler ; legs thick ; anterior femora 

 slightly enlarged. Length f . 



This species, which I suppose to be identical with Dr. 

 Burmeister's rufus, I have found on the Kestril (Falco 

 tinriuriculus), and received specimens from my brother 

 taken on the Merlin (Falco ^Esalon), and Sparrow- Hawk 

 (Accipiter fringillarius). It approaches very near to the 

 preceding species, but is generally smaller, and always 

 devoid of the dark margin. I suspect it is the insect figured 

 by Lyonet as N. platyrhynchus. In my figure the clypeus 

 is represented rather too broad. 



11. NIRMUS CUCULI. Denny. (Louse of the Cuckow.) 



Plate X. Fig. 11. 



Fulvous, smooth and shining, posterior margin of the 

 metathorax produced in the centre ; abdomen with obscure 

 transverse bands. 



Head sub-panduriform, depressed at the occiput ; clypeus 

 with a chestnut margin ; apex pale ; antennae very slender, 

 filiform joints nearly equal; trabeculae very small; pro- 



