35(1 IXSECTS INFESTING DOMESTIC ANIMALS. 



live ujion the sweets of flowers. The larva of tliis tlv (Fig. 

 .")()0^/ )lives in the vicinity of fresh Avater streams; thrv liave 

 been found beneath submerged stones in a small stream of 

 running water, among floating pieces of wood, and on dry 

 land less than a rod from n small permanent stream of water. 

 It appears that a certain degree of moisture is necessary for 

 their existence, although they are not strictly aquatic. They 

 feed upun snails, and probably eartli worms. These larvse 

 measures from one inch and nine lines to two inches and 

 three lines in length, and are nearly cylindrical, but taper at 

 each end; they are of a trans])arent greenisli or ycllowisli 

 color, and furnished above and below with large rounded 

 sponge-like tubercles which are extended or retracted at the 

 will of tlie insect. They reacli their full size in mid-Summer, 

 and then transform into pup;!" (Fig. ?){'i)lt), within their cells in 

 the earth. In the course of a week or so tlicy ;ire changed 

 into perfect flies. 



Several other horse-flies occur in this State ; the one often- 

 est met with is known as the ''green-headed horse-fl}''' — Taha- 

 nus lineola — Fabr. ; and may easily be distinguished by having 

 a whitisli line on the back of the abdomen: tlir head is usu- 

 ally green. It is a much smaller species than the above. 



riTAPTKK rcXLV. 



The Horse Bot-fly. 



{(Ksirx's eipi.l. — Fabricius.) 



Order, Diptera ; Family, CEsteid.t-:. 



[Living in the stomach of tlie horse; a yellowish-red or 

 whitish grub, thinly covered with small bristles or spines. j 



Fig. 361. — Horse Bot-flv, male — colors, 



Fis. 3G1. -1 11 1 11 1 ' 



grayish-yellow anil black. 



The eggs from which these grubs hatch are 



deposited in j)a1cbcs by the female fly, and 



each egg is attachctl to the hair by a sticky 



fluid which is d(.']»osited with it. \\\ a few 



weeks llie iirub hatches, and is conveved to 



