192 Dr. T. A. Chapman on the Paniaitisin 



give ail accurate sketch of the life-history oi E?tipiphorus,a.ivl 

 to be in harnionv with all the facts yet recorded both of Rhi- 

 2)ij)Iion(s itself and of other parasites whose similar habits 

 render their history fairly available in explainiiiti; that oi' Ii/ii- 

 piphorus. The account there given is that Iihijjij)horns ''de- 

 posits its egg upon the grub of the wasp at the moment it 

 assumes the pupa (/. c. spins or covers itself in the cell) ; as 

 soon as the egg is hatched, it devours the grub of the wasp 

 entirely, and itself assumes the pupa- and imago-form in the 

 cell of the wasp." 



The mode of oviposition here noted of IiJiij)ij)Jiorus is, I 

 believe, that followed by it, although it will be seen that I am 

 here at issue not only with Mr. Murray, but also with ]\Ir. 

 Smith, with whom on all other points I agree. If Mr. Dcni- 

 son's view (but for the slight disagreement noted, I should 

 here, as I shall in the rest of these remarks, have said Mr. 

 Smith's view) of the history of Bhipij^Jionis is correct, the 

 relation oi lilnpijyhorus to the wasp is, mutatis iitutandis, jire- 

 cisely the same as that of Ckrysis hidentata to Oclynerus spi- 

 nipes. The larva of Chrijsis hidentata feeds on that of the 

 solitary wasp, from whose cocoon emerges, not the wasp, but 

 the Chrysis. Now in this instance the egg of the parasite is 

 not laid until after the larva of the wasp has done feeding, 

 and is spinning its cocoon. Before I ascertained this fact, I 

 had formed the same theory as to the period of oviposition as 

 Mr. Smith has done in the case of the lihijnphorns^ and made 

 in consefjuence many a vain search for the egg of Ckrysis hi- 

 dentata beside the feeding larva of the Odynertis. The parent 

 Ckrysis has many more difficulties to overcome (what these 

 are is not material to the present subject) in depositing her 

 eggs than the BliijnpJiorus^ to whom it must be as easy to 

 deposit an egg beside a full-fed larva, during or just before 

 spinning, as in an cnij^ty cell. There are other instances re- 

 corded of parasites similarly depositing their eggs beside full- 

 fed larva?, none, that 1 know of, of an egg remaining dormant 

 beside a feeding larva. ]\[r. ^Murray a])pcars to interpret Mr. 

 Smith's view to be that tlie larva oi lihipij^horus hatches at 

 tlie same time as that of the wasp, and then walks off to find 

 a full-fed lai-va to eat. I quite agree with Mr. ]Mun-ay's com- 

 ments on such a theoiy, but feel satisfied that Mr. Smitli 

 really meant that the egg lay dormant until its companion, 

 the egg of the wasp, was a full-fed larva. 



The two eggs found by ^Ir. Muiray in some cells of the 

 wasp both appear to nie to be undoubtedly eggs of the wasp. 

 I think it extremel}' improbable that the egg of B/iijjij//i<trus 

 should be precisely the same as, however similar it may be to, 



