38 BULLETIN 810, U. S. DEPAKTMENT OF AGRICTILTURE. 



D. — Healthy larva near the age at which capping takes place. 



E. — Dorsolateral view of a larva dead of European foulbrood. The ends are 

 directed toward the bottom of the cell. 



F. — ^Larva dead of European foulbrood. The body occupies a spiral position 

 in the cell. 



G. — Healthy larva approaching the age at which capping takes place. 



H. — Lateral view of larva dead of European foulbrood seen with the roof of 

 the cell removed. The ends are directed toward the bottom and the dorsal 

 surface toward the mouth of the cell. 



L — Dead larva similar to H but having been dead somewhat longer. 



Plate IV 



A. — Young larva dead of European foulbrood. The chitinous capsule and 

 tracheae are prominent. 



B. — Fragments of young larva dead of European foulbrood, a portion having 

 been removed by adult bees after its death. 



C. — Lateral view of larva dead of European foulbrood, the roof of the cell 

 having been removed. The ends in this instance are directed more or less to- 

 ward the mouth of the cell. 



D. — Lateroventral view of larva dead of European foulbrood. The body lies 

 with the dorsal portion against the floor of the cell. 



E. — Larva dead of European foulbrood lying on the floor of the cell in some- 

 what lengthwise position. 



F. — Scale of European foulbrood larva which had occupied a somewhat spiral 

 position in the cell. 



G. — Scale of a European foulbrood larva which had occupied a position some- 

 what as shown in D. This scale and the one shown in F can be removed intact 

 rather easily and without tearing the wall of the cell. 



Plate V 



Larvae (prepupse) of bees dead of European foulbrood which had already 

 assumed before death a lengthwise position in the cell. 



A. — Fragment of European foulbrood soon after death. A portion of the 

 larva has been removed by the adult bee. 



B. — Entire cap of cell containing larva dead of European foulbrood. 



0. — Punctured cap of cell containing the remains of a larva dead of Euro- 

 pean foulbrood. 



D. — End view of larva dead of European foulbrood. 



E. — End view of larva dead of European foulbrood, lying with its dorsal 

 surface against the floor of the cell. Considerable drying of the remains has 

 taken place. 



F. — End view of scale of European foulbrood larva which had reached be- 

 fore death the age at which the endwise position in the cell is assumed. 



G. — Ventral view of European foulbrood larva. Stage similar to D. Turgid- 

 ity is lost to a large extent and the segmented markings are less distinct than 

 in healthy larvae. 



H. — Larva which has been dead of European foulbrood for a longer period 

 than illustrated in G. The ridge and furrows indicating the segments of the 

 body are not marked. 



I. — Scale of European foulbrood similar to F. The larva before death had 

 reached the endwise position in the cell. These scales resemble very much 

 those of American foulbrood. They are more easily removed, however, do 

 not adhere so closely to the floor of the cell, and are more rubberlike in con- 

 sistency, breaking less readily than those of American foulbrood. 



