Second I itstar. -^Thh was observed of but one gr\ib, which i-(M|uirt'd 

 from 30 to 32 days lietwcen the tirst and second molts. The measure- 

 ments of a single grub in this instar were: length, '22 millimeters; 

 breadth of head, 2.65 millimeters. 



Third Insfar. — The duration of tliis instar has not yet been ob- 

 tained. It is doubtless the same as that of P. guankana. The av- 

 erage dimensions of four grubs in this instar were: length. 28 milli- 

 meters; breadth of head, 4.4 millimeters. 



The Pupa. 



The duration of pupal stage, fi'om a single observation, was 23 

 days. The measurements of this jiupa were: length. 20 millimeters; 

 breadth at middle, 9.2 millimeters. 



Food-Plant^ op Adult. 



Some of the connnoner trees and plants of th(^ iini-th side of the 

 Island upon which this species feeds in common with tlie bii"'.'.cr species 

 {vavdiixi or po) fnricens'Ls) are: Hamboynnt. casujiriiia. aluumdro, 

 bucar ( Erijfhiiiio fda^ica). i|uene])a ( Melicocva hijiif/a). Jobo (Sjxni- 

 dias lutea), sonnadera {Albizzia Tehhel-), muiieco {Cordia horin- 

 quena^ . and Cordia corunthosa. T]\(' list is not a coinplctc one, but 

 would include a large munber of comumn forest and fi'uit trees, on 

 which sufficient observations have not yet been made to know what 

 species attack them. 



. A few trees and plants on which lliis species feeds abundantly 1o 

 the exclusion of tln^ two largt-r si)eci(s ai'c: gra|)efruit. oraniie. guawi. 

 silk o;d< i (lrardl( (t rohiisfa) , Ac(d!jj)li(i irilLrsi'ino, garden I'ose, .1//- 

 cDin'i rac/ iiiDsd. Clidfimia liirfa, fjiiilniKi idimtrd, Triiiiii pliclffi s|)p., 

 and I'mid Inhala. I^'urther obsei-vations will lengthen the list. 



II A 15 ITS OK Anri.Ts. 



The attijiclion of the beetles to light, and the hours of Highl and 

 of copulation in the evening, ai'e pr;;ctically the same as for the adult 

 of the Guanica white-grul). Flight has been obsei'ved up to 7 :.')() P. M., 

 ;'.nd copulation up to 8:1;") P. M. 



Studies ;ii'e being made to ascei-tain the ax'crage length of the 

 beetle's life, the duration of the period of oviposition. and the num- 

 ber of eggs laid by a female, but are not yet complete. . 



Insect a.vd Frxcas Kxi:.Mn:s. 

 Subsequent to the segregation of the dift'ercnt species of I'luilJo 



162 



