There is another gadfly which finds a crèche in the sheep; but instead of lodging in its stomach, it instals itself in the nostrils, which are more easily reached. This second species goes through its evolutions in the vestibule.
This is the species which sometimes introduces itself into the body of man. Many instances of this have been known, and our late colleague Spring gave a very interesting
account of one of them in the bulletins of the Belgian Academy.
A gadfly found at Cayenne is distinguished by the name of the Macaco Worm; it belongs to the genus Cuterebra, and usually attacks the skin of oxen and dogs in South America. It is accidentally found sometimes on man. This is the Cuterebra noxialis. We here give the representation of it.
There is also a gadfly on the ox.
Professor Joly has devoted himself to zoological researches on Œstridæ in general. Professor Schroeder Vander Kolken, in Holland, and Mons. Brauer, in Austria, have studied them with great success.
The Hippoboscus is a fly which is very greedy of blood, and attaches itself to horses and oxen, especially under the tail, in the parts where there is less hair. It sometimes also attacks man.
Fig. 37.—Macaco Worm.