July, 1914.] THE APPLE MAGGOT. 89 



The Larva. Length, full-grown, 7 to 8 mm. Color white, 

 or sometimes slightly yellowish or greenish. Anterior end pointed; 

 posterior end somewhat blunt. Fourteen. segments. The body 

 thickest at the ninth to the eleventh; narrowing gradually and 

 then rapidly to the first ; narrowing slowly from the eleventh to 

 the fourteenth. The fourteenth segment has the dorsal surface 

 cut off diagonally downward. On this surface are two caudal 

 spiracles. Within the second, third and fourth segments is a chiti- 

 nous framework, visible by transmitted light, which anchors a 

 pair of black, chitinized, rasping hooks, projecting from the basal 

 surface of the first segment. The first three segments are re- 

 tracted into the fourth when the larva is disturbed. At the union 

 of the third and fourth segments, on each side of the dorsal sur- 

 face, is a yellowish, funnel-shaped, cephalic spiracle, connected 



Fig. 2. Egg of the Apple Maggot — Enlarged. 



by a tracheal tube with the corresponding caudal spiracle. Trans- 

 verse tracheal tubes connect the lateral tubes immediately 

 anterior to the fifth and fourteenth segments. 



The Pupa. The pupa is enclosed within the shortened and 

 hardened larval integument, forming the puparium. The latter 

 is brownish, oval, the two ends somewhat evenly rounded. 

 Length 4.5 mm.; width 2.25 mm. The first three segments of 

 the larval integument are contracted, so that the cephalic spir- 

 acles project anteriorly. The last segment contracted slightly 

 but the caudal spiracles remain visible. The pupa within is 

 white, the head tipped ventrally, the legs and wing buds closely 

 folded. 



CONTROL MEASURES DIRECTED AGAINST THE ADULT. 



From the beginning of this investigation hope was enter- 

 tained that some measure of control might be devised directed 



