The average imiul>ei' of eggs laid per day, for tlie beetles' wiiole 

 life, was .51; the average uuinber per day for the egg-laying period 

 only was 1.19 eggs. 



The luaximuni rate of egg laying was 13 eggs laid in one day !)y 

 one female. Xo other eggs were laid by the same female within 10 

 days before or after the date of laying the 13 eggs. 



Comparing this species with /■*. vandinei, it will hv seen that the 

 average number of eggs per female, and the maxiiuuiii IcMigtli of egg- 

 laying period, is about the same for the two. 



The average length of life of a. female, and the luaximuui numl)er 

 of eggs laid in 24 hours, is considerably less for this species than for 

 vandinei. 



On the other hand, the average number of eggs laid per day, 

 and the average duration of the egg-laying period, is noticeably 

 greater for this species than for vandinei. The average female of 

 gnanicana laid eggs at a rate of one every two days; the average 

 female of vat\di)u i laid at the i-ate of one every three days. 



Insect and Fcngts Enemies. 



Xo insect |)arasites oi' pi-edacious enemies are yet known to prey 

 upon this ^lay-beetle or its larva. 



The stages of this insect that became infected by the green mus- 

 cai'dine fungus in experimental boxes were as follows: Eight eggs, 

 one grub of first instar, one grub of second instar, and nine ( or proba- 

 bly more) adults. The hightest per cent of infection was among the 

 adults; the next highest among the eggs. Xo grubs of the Inst instai- 

 wei'e recoi'ded as infected by the fungus. 



THE CITRUS WHITE-GRUB. 



I'll i/lloplKn/d lifri n. sp.* 



This s])ecies receives its name from the fai-t that, although i1 fctnls 

 upon a larg(^ vaiiety of plants, it is distinetly an inii.-ibitant of tlie 

 citrus oi'chards. and its lai'va is a pc-st that often gives mncli ti'otiblc 

 to young citi'us trees. Tlu- damage the grub;j do to older ti'ees is 

 usually not known, and goes unheeded because of the gi-catiT ai)i!ity 

 of older trees to stand 1he reduetien in feeding roots ransed by the 

 grubs. Young trees (piiekly show the damage of tlie i-oot trinuiiing 

 done b\- the grubs. Inqnii'ies that have been made of citrus yrowei's 



' Tliis species liiis lieeii ineiitioiied :is ;i supposed variety of P. yitainratia, under the 

 name of "Lnrhiuixtpiiin media (northern form)." in the Fourth Report of the Board of 

 ComniissiiiiM IS <if' .\'.;iicnlture of Pnrtu Kiin. page 48. 



i-)9 



