they are particularly infeftcd with an 'infect, in form like the 

 common fheep tick, which we believe often proves fatal to 

 them ; an occurrence of this kind came under the immediate 

 notice of a gentleman refiding in Parliament-Street, who 

 kindly communicated the circumftance to us with the bird: 

 a fwallow was obferved to fall down in the ftreet without 

 any vifible occafion, which he took up, and on clofe exami- 

 nation found a number of the above-named infects attached to 

 its throat and body, fucking in the manner of leaches ; the 

 bird was quite dead, it was very fat, and there was no other 

 feeming caufe for its death than thefe infects* 



This fpecies cafts the undigeftible parts of its food in the 

 fame manner as the hawk tribe, we are not able to fay 

 whether this is common to the genus, but conceive it moil 

 probably is. 



We have had a fand martin fent to us which was mot on 

 the twentieth of the pre fent month (March) and we faw two 

 of the fpecies now before us on the twenty-third, which is 

 earlier than they ufually appear with us. 



