parasilcfi in Ncsl of Bomhvp; derJimnelhif;. 103 



half the cell was filled witli sawdust, into wliich it had retired, 

 and no more was seen of the insect till May 23, 1919, when the 

 contents of the vessel were turned out. The insect then ran out 

 actively as an adult male, dragging at the hind end of its body 

 an exuvium, which proved, on being mounted in balsam, to bo 

 the cast skin of the larva, not of the pupa. I cannot say, therefore, 

 at what date this larva pupated. . 



The other larva allowed more of its history to be followed. It, 

 too, was moving about in its cell from the time when it excavated 

 the latter (Aug. 9) till Aug. 14. Aug. 16, larva much contracted, 

 lying on its ventral surface. Aug. 18-31, larva turning about, 

 sometimes on its back, sometimes on its ventral surface. Sept. 2, 

 sawdust pushed over glass, larva invisible. Sept. 6, larva visible 

 again, contracted, Ijing on its back in a horizontal position. 

 Sept. 10, moving actively about in its cell. Sept. 11 and 13, lying 

 straight out on its ventral surface (weather very cold). Sept. 17 

 and 20, larva lying on its side. Sept. 23, larva lying on its back 

 on the glass bottom of tlie vessel. Sept. 26 and 30, larva retired 

 into sawdust and was hardly visible. Oct. 8, lying On its back. 

 At the beginning of November it had withdrawn so far into the 

 sawdust that it was not clearly visible through the glass, and 

 after Nov. 15 it was not visible at all till Jan. 15, 1919, during a 

 mild spell, when it was on its ventral side with head towards the 

 glass, having turned completely round since the time when it was 

 last clearly visible in the autumn. At this time (Jan. 15) it was 

 quite clearly seen to be still a larva. The insect was then visible 

 no more till May 10, when (after several warm days) it was seen 

 to be a pupa, quite pale, with no daik pigment in its eyes or in 

 any other part. The pupa was observed nearly every day, and 

 moved convulsively when the vessel was placed in a strong light. 

 May 14, pupa lying on ventral surface, eyes darkening. May 15, 

 lying on its back. May 19, pupa on its back, eyes quite black, 

 general colour yellowish. May 22, morning, the adult (a female) 

 had emerged and was lying in its cell. On the evening of May 23 

 the contents of the vessel were turned out, and the beetle ran 

 out actively, with its dark coloration well developed. Assuming, 

 therefore, that the transformation from a larva had only recently 

 taken place when the pupa was first seen on May 10, the pupal 

 stage lasted 12 days at least, perhaps i-ather longer. 



Occurrence of Anthero2)hagus in bees'' nests. — The occur- 

 rence of several species of Anfhero]}hagns in humble-bees' 

 nests is well known. This is not only the case with the 

 European forms, for Grouvelle (14) has described from 



