174 MONOGRAPHIA 



Head very long, somewhat triangular, with two depressed 

 lines at the base ; clypeus slightly depressed, lateral margin 

 pitchy, and subangular, interrupted opposite the antennse ; 

 eyes small but prominent ; antennae pale ferruginous, long, 

 and filiform ; prothorax transverse and small ; metathorax 

 the width of the head, oblong quadrate, channelled in the 

 centre ; abdomen elongate, nearly filiform, bright chestnut, 

 darkest down the centre ; stigmatic fovea very distinct, 

 lateral margin together with that of the thorax pitchy ; legs 

 long, thick and pale chestnut. Length 2. 



I have seen only two specimens of this species, the one 

 from which the figure was taken I found beneath the wing 

 of a Stormy Petrel (Thalassidroma pelagica), the second 

 specimen was sent from Carlisle by Mr. Heysham, who 

 took it from a specimen of Leach's Petrel (Thalassidroma 

 Leachii), both of which are females. 



10. LIPEURUS LEUCOPYGUS. (Louse of the Heron.) 



Plate XIV. Fig. 4. 



Greyish-white, depressed, and shining, lateral margin 

 black, last two segments of the abdomen spotless. 



Lipeurus leucopygus. Burmeister Handbuch ii. pt. ii. p. 434. spe. 9. Li- 

 peurus obtusus. Steph. Cat. pt. ii. 332. Pediculus Ardese cinerese. 

 Linn. Syst. Nat. ii. n. 23. p. 1019. edit. xiii. n. 23. t. 2919. Fabr. 

 Syst. Ent. vi. n. 30. p. 422. Stewart's Elements Nat. Hist. ii. 299. n. 

 23. Pediculus ardealis. Frisch. Insect. 5. tab. 4. Scop. Ent. Car- 

 nio. 384. n. 104C. Pulex Ardese. Redi. Experi. pi. vi. The Louse 

 of the Heron. Albin, Spi. pi. 45. fig. inf. Shaw's Gen. Zool. vi. 112. 

 fig. mid. 



Head oblong triangular, dull yellow- white, with a long 

 black streak before, and a short diagonal band behind the 

 antennae on each side, vertex concave, occiput with two 

 depressed lines ; eyes pale yellow ; antennae about half the 

 length of the head, filiform in the female, the third joint in 



