I sounds like what happens with varroa.
 
   The confirmation would be to examine the remaining capped brood cells.
   If varroa was responsible for the problem, the mites will be present in
   the sealed cells.
 
 
   good luck
 
 
   Kerry Clark, Apiculture Specialist
   B.C. Ministry of Agriculture
   1201 103 Ave
   Dawson Creek B.C.
        V1G 4J2  CANADA          Tel (604) 784-2225     fax (604) 784-2299
   INTERNET [log in to unmask]