June, 191-] Townsend: Head AND Throat Bots. . 99 



failing to secure a hold on either the soft palate or the base of the 

 tongue, drop through the open epiglottis and become attached to the 

 walls of the larynx between or beneath the vocal chords. 



9. Lungs. — In some instances the larvae lose their hold in the 

 larynx and are compelled to pass down one of the bronchi, thus reach- 

 ing the lungs. The only case of the kind on record is that mentioned 

 by Brauer, in which a stimulator larva was taken from the lung of 

 a roe deer in Europe (Wein. Ent. Zeit., V, 305). 



10. Gullet. — Reached from the pharynx or mouth. 



11. Throat Pouches. — Reached from gullet. The formation by 

 the larvae of these pouches or pockets in the throat constitutes a 

 remarkable digression from the normal, and has evidently resulted 

 from their efforts to escape being swallowed and passed into the 

 stomach. 



There are so far recorded from America only three species of 

 this genus. One of these, C. pratti, is known in both the fly and third- 

 stage larva. The others are C. phobifer, known only in the fly, and 

 C. macrotis, known only in the third-stage larva, but it is highly 

 probable that both are the same species. It is with the view of 

 summing up the known facts and calling attention to the desirability 

 of securing further material from all parts of the country that this 

 article is prepared. By rearing the flies, and even by securing alco- 

 holic larvae from various sources, much can be done toward connect- 

 ing the flies and larvae of the same species and determining their range 

 and host relations. The available records and the material so far 

 known may be considered most conveniently in chronological order, 

 as follows : 



1 81 5. One male fly collected by J. Abbott in Georgia was de- 

 scriber by Bracy Clark as GEstrus phobifer, the description being 

 accompanied by an excellent figure (Essay on Bots, p. 69, pi. 2, fig. 

 30). The figure indicates the male in the comparatively narrow 

 front, the wing venation leaves no doubt as to the genus, and the 

 description is sufficiently clear for the identification of the s'pecies. 

 It is known that Abbott lived somewhere between Savannah and 

 Atlanta. Whether he secured this fly in the lower region or back in 

 the hills is unknown but immaterial, as the host no doubt ranged in 

 both districts. 



1863. Two third-stage larvae tagen from throat of Odocoileus 



