CERATITIS CITRIPERDA. 53 



they have the power of springing to a considerable dis- 

 tance, in the same manner as the well-known Cheese 

 Maggot. When full grown they eat their way out of the 

 orange, and undergo the change to the pupa state on 

 the outside. 



" The pupa is a small, hard, brown, oval body, the 

 outer surface scarcely indicating any traces of articu- 

 lation, being the dried skin of the larva, within which 

 the real pupa is enclosed." J. 0. W. 



No larvae (or maggots) were forwarded, but the pupa 

 or chrysalis case, of which several were sent, corresponded 

 with the above description. 



In regard to method of attack and various points of 

 life history it was considered by Prof. Westwood, from 

 examination of imported oranges, that the presence of 

 infestation might be inferred sometimes by a puncture 

 not larger than that made by a pin, " but generally 

 surrounded by a withered and discoloured spot varying 

 in size from that of a sixpence to a half-crown." " On 

 opening the orange the interior beneath the discoloured 

 space is found to be decayed, ;and in the middle of this 

 decaying mass the maggot is to be found." 



From notes placed in my hands by Mr. Hellier 

 regarding this fly (now generally known as the Trypeta 

 Fly in the infested district) it appears that, some seven 

 or eight years ago, the mischief attracted the attention 

 of the Albany Natural History Society (when he gave 

 the result of his investigations), and later on (in 1874) 

 he again reported on the subject. In order to be sure 

 of the species of insect giving rise to the mischief, " a 

 collection was made of the various kinds of fruit chiefly 

 infested, consisting of apricots, peaches, pears, apples, 

 and figs. The fruits containing the maggots were placed 

 under glase shades. In the course of three or four days, 

 or a week, according to their age, they changed into the 

 chrysalis or pupa state. In ten days from the time they 

 assumed the pupa state the perfect insect appeared. The 

 fly was exactly the same in whatever fruit the insect 

 was bred." 



