176 MONOGRAPHIA 



Lipeurus temporalis. Nitzsch. Germ. Mag. iii. 292. Steph. Syst. Cat.pt. 

 ii.p. 332. Pediculus Mergi. Fabr. Spe. Inst. ii. 480, 23. Stew. Elem. 

 Nat. Hist. ii. 299. Ricinis Mergi Serrati. De Geer, Inst. vii. p. 78. 5. 

 tab. iv. fig. 13. 



Pale ochraceous, smooth, shining, and depressed ; head 

 obtusely triangular, bright ferruginous ; clypeus transverse, 

 with two oblique chestnut lines, uniting with a semicircular 

 band across the vertex ; occiput rotundate, with two short 

 chestnut lines ; eyes small ; antennae, pale tawny, and 

 rather thick ; pro thorax transverse, narrower than the head, 

 rotundate ; metathorax pale tawny, with a broad deep liver- 

 brown indented fascia on each side, base truncate, with a 

 row of stiff hairs ; abdomen pale ochraceous, the first seven 

 segments with a quadrangular deep liver-coloured patch on 

 each side, sutural rings pale, last two segments dull chest- 

 nut ; legs long, pale, and tawny, with a large brown spot in 

 the centre of each femur. Length 1 J. 



Communicated by Mr. Thompson from the Red-breasted 

 Merganser (Mergus serrator), and by Rev. L. Jenyns, and 

 Mr. G. R. Denny, from the Goosander (Mergus Mergan- 

 ser). I have not had the good fortune to see a male. 



12. LIPEURUS SQUALIDUS. (Louse of the Duck.) 



Plate XIV. Fig. 5. 



Head, thorax, and legs pale ochraceous-yellow ; abdomen 

 dull white, the margin with a row of pitchy-black quadran- 

 gular patches ; stigmatic orifices pale. 



Lipeurus squalidus. Nitzsch. Germ. Mag. iii. p. 292. Steph. Cat. pt. ii. 

 332. Pediculus Anatis. Fabr. Syst. Ant. 345. Stew. Elem. ii. 300. 



Filiform, shining and depressed ; head pale ochraceous, 

 obtusely triangular, with two short depressed lines at the 

 base, and a semicircular one across the centre, the lateral 

 margins with an interrupted black band ; eyes prominent ; 



