326 ODONTOGNATHUS, (ESTRUS. 



O. 



4 1. ODONTOGNATHUS. Spec. 1* 

 acideata, compressed ; lower jaw longest 



See MS P. 



812. (ESTRUS. Spec. 12. 



bowls, (gad-fly,) wings brown without spots ; ab- 

 domen with a black band in the middle, and 

 orange-yellow hairs at the tip. Deposites its 

 eggs under the skin of cattle, which causes 

 them to run and bellow when in the larva state* 

 ) (leg nitter,) wings whitish with a black band 

 in the middle and two dots at the tip. Depo- 

 sites its eggs on the hairs of horses' legs in the 

 the summer months. 

 h<emorrhoukt&s, (lip nitter,) wings brownish with- 

 out spots ; abdomen black, the base white and 

 fulvous at the tip. Deposites eggs on the lips 

 of horses. 



veterinus, (throat nitler, bot-fly,) wings without 

 spots; body ferruginous; sides of the thorax 

 and base of the abdomen with white hairs. A 

 little smaller than the leg nitter. Deposites 

 eggs under the skin of the throat of horses in 

 September. 



Remarks. The three last species are the nit- 

 ters so well known in this country ; particularly 

 the leg and throat nitters. It is the received opin- 

 ion that the nits on the legs of horses, are taken 

 into the mouth of the horse, conveyed into the 

 intestines, and at length become the bot larva. 

 This is a very extravagant -conjecture and requires 

 proof. 



