238 MONOGRAPHIA 



found this species, which it was. The species appears 

 scarce, and though I have sought for it upon several speci- 

 mens of the Swift (Cypselus apus), yet never succeeded in 

 capturing a single individual, nor have I seen it in any 

 collection to which I have had access ; my two examples 

 were taken in Norfolk upon the Swift, and forwarded by 

 my brother. 



2. EUREUM MALLEUS. (Louse of the Swallow.) 

 Latum concolor subfuscum, oculis nigris, capite maximo 

 pronotaque minori semilunatis, brevissimis. Long, f . 



Eureum malleus. Nitzsch. Germ. Mag. iii. p. 301. Steph. Cat. pt. ii. p. 

 335. Burmeister Handbuch ii. pt. ii. p. 441. 



From the great rarity of this species, I have been unable 

 to obtain a figure of it, therefore insert Dr. Burmeister's 

 specific character, for which I conceive no apology is ne- 

 cessary. As in every instance where a species is recorded 

 as a parasite of a bird which belongs to the British Fauna, 

 but which fifteen years' search has hitherto failed to discover, 

 I consider it more justifiable to insert the description of 

 another author, than to leave it out of my enumeration, 

 when there cannot be a question but it is belonging to our 

 island. 



SUB-GENUS VI. LAEMOBOTHRIUM. (Nitzsch.) 



SUB-GENERIC CHARACTER. 



Head oblong, sinuated in front, temporal lobes small, pro- 

 duced into angular projections backwards ; antenna al- 

 ways concealed, if any ? throat concave ; mesothorax 

 none ; metathorax continuous with the abdomen ; abdo- 

 men of nine segments ? 

 Infests the Genera Falco, Vultur, Struthio, Fulica, and 



