STATE AGRICULTURAL SOCIETY. 481 



SUPPLEMENT. 



at the mouth — several of the bot-flies being destitute of any 

 opening at the mouth and taking no nourishment after they 

 reach their perfect state. Nine species have been described by 

 different authoi^ as pertaining to this genus, all of them belong- 

 ing to America save one which occurs in India. Nothing, how- 

 ever, appears to be known of the habits of the flies of this genus, 

 except that the larvae of two of them, w^hich are found in the 

 state of Georgia, reside under the skin of the rabbit. And this 

 species appears to be different from any of those heretofore de- 

 scribed. It is a large thick-bodied fly nearly three-fourths of an 

 inch long, its head, thorax and abdomen of the same width, with 

 the abdomen but little longer than wide and its smoky brown 

 wings of about the same length with the abdomen and held 

 together flat upon it. Its thorax is covered with whitish hairs 

 which are more dense upon the sides, where is a large black dot. 

 Its face is white with a large black dot uj)on each cheek, and the 

 last segment of its abdomen is clothed with whitish hairs. 



The dirt in the box had a depth of about two inches and the 

 worm had penetrated to its bottom and there changed to a pupa, 

 its outer skin becoming dry and hard and forming the outer cov- 

 ering or pupa-case of the insect. 



This PCPARIUM is 0.80 long and 0.40 broad, nearly cylindrical, though flat- 

 tened anteriorly in the region of the breast, and rounded at both ends. It is 

 of a tough crustaceous substance, as thick and hard as the shell of a chestnut, 

 and its whole surface is rough like shagreen, being crowded with elevated 

 black shining points, to which a coating of dirt adheres as though it were 

 glued thereto. It does not show any elevated transverse ridges, like those 

 upon the larva, but six impressed lines or sutures are very perceptible, divid- 

 ing it into seven segments which are mostly of equal length. The anterior one 

 of these segments breaks olf obliquely at its suture, to enable the fly t» escape, 

 the piece thus separated being a large roundish or egg-shaped scale, luore broad 

 than long, Ix'ing 30 broad, and this scale shows upon its inner surface two 

 curved elevated lines, which are sutures dividing it into three segments of 

 nearly equal length; and at its anterior end is a small fourth segment marked 

 by a strong depression in the surface. We thus find a total ol ten segments in 

 the pupa-case, the same niimber which wo saw in the larva, those representing 

 the head and thorax being murh (•lmnge<l and soldered together into a single 

 llattish piece instead of the circuhir rings which they formed in the larva. 

 The small anterior segment has a wide shallow notch on its forward edge, on 

 each side of which, exteriorly, is a round tuft or button composed of a mass 



FAg. Trans.] EE 



