310 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 1 



Plate 6: Anteun;p, tibiae aud cornicles of Aphis pomi, 1 to 6 ; Aphis per- 

 sicw-niffer, 7; Myzus cerasi, 8; Myzus persicce, 9-17; ScMzoneurq, lanigera, 

 18-19; egg shell of Aphis pomi, 20. Enlarged 80 diameters in each case, 

 except the shell, which is enlarged 20 diameters. This plate is a modification 

 of Plate IV, Bull. 133, Colo. Exp. Sta., by Gillette and Taylor, M. A. Palmer, 

 artist. 



SAW FLY LARVAE IN APPLES 



By R. L. Webster, Ames, loiva 



The saw fly, Taxo)ius nigrisoma Nort., sometimes called the "Dock 

 False-worm," has been reported several times as eating into apples. 

 Doctor Fletcher and Professor Lochhead have already noted this 

 rather peculiar habit, so that it is by no means unknown. Three 

 years ago I found several saw fly larvaj in Greening apples, which 

 larvae turned out to be the above species. The apples were shipped 

 from New York state and were kept in the cellar at my home during 

 the winter. The larvae were studied in the entomological laboratory 

 at the University of Illinois in March and Apjril, 1905. 



The burrow containing the larva extended about half the distance 

 from the skin to the core of the apple. From the exterior the burrow 

 was characterized by a circular, brownish, discolored patch, in the 

 center of which was the small hole made by the larva when entering 

 the apple. The burrow w^as considerably larger in diameter than the 

 larva itself, and the larva was partially curled up within. None had 

 pupated when they were found early in ]March. 



On ]\rarch 7th several larv« were placed in a breeding cage in the 

 laboratory. Small holes were made in the apples, to serve as burrows. 

 The larvae, however, would not remain in these holes, but pupated, 

 without forming a cocoon, on the damp sand of the breeding cage. 

 Larva? pupated on the 27th and 29th of March in the laboratory, and 

 the adults emerged the 1st and 3d of April. The average length of 

 the pupal stage was 5.6 days. 



Chittenden and Titus have already given an excellent description 

 of the larva in Bulletin 54 of the Bureau of Entomology, so that it is 

 unnecessary to give it here. 



About the same time Prof. E. S. G. Titus, then connected with the 

 Bureau of Entomology at Washington, reared this species in the insec- 

 tary there, from an apple purchased by INIr. Couden in Washington. 

 The adults reared from the apple in Illinois were sent to Professor 

 Titus and were pronounced to be the same species, Taxomis nigrisoma 

 Nort. 



