IIIRUDO, HISTEK. 197 



53. HIRUDO. Spec. 17. 



jnedicinalis, (doctor's leech,) elongated, olive-black 

 with yellow ferruginous lines above, and spot- 

 ted with yellow beneath. 



sanguisuga, (blood-sucker, horse-leech,) elongated, 

 olive-brown, with an ochre-yellow marginal 

 band. 



See MS. P. 



2 2. HIKUNDO. Spec. 38. 



Section A. Toes three before and one behind. 



rustica, (swallow,) front and chin chcsnut ; tail- 

 feathers, except the two middle ones, with a 

 white spot ; bill black. 6 inches long. 



urlicd) (martin bird,) bluish-black, white beneath ; 

 tail-feathers without spots ; bill black ; mouth 

 yellow. Five and a half inches long. 



riparia, (sand -bank martin, bank swallow,) cine- 

 reous; chin and belly white; bill blackish; 

 throat encircled with a mouse coloured ring. 



d) (chimney swallow,) tail-feathers equal, 

 naked and subulate at the tip ; body and bill 

 brown ; chiu whitish. Four and a quarter in- 

 ches long. 



Section B. Toes all placed forward. 



apus) (steeple swallow, barn swallow,) blackish ; 



j chin white ; feet small, scaly, fit for walking ; 

 but adapted to clinging to walls. 7 or 8 inches 

 long. Is much of its time on the wing. 



See M v P. 



8 5. HISTER. Spec. 25. 



tinicolor, black ; shells obliquely striate. 



See MS. P. 



*17 



