of the elytra are plumbeous as in the male. This character raa.y 

 viiry somewhat in individuals of any one locality, but is fairly con- 

 stant for the species, from whatever locality. 



The sure character by which to distinguish this species from /'. 

 guanicana is in the male genitalia, which has been figured in the 

 preceding section of this paper. That part of the medium lobe of 

 the male genitalia which has been called the spatha is depressed, 

 chitinized and polished above, and unsyinmetrical, being curved or 

 hooked upward on the left side, where it terminates in a serrated 

 edge. 



The spatha of the male genitalia of P. guanicana, on the other 

 hand, is thicker vertically than horizontally, is bilaterally symmetri- 

 cal, and is fleshy except for two rows of minute, brown, prostrate 

 spinules (directed forward) that form a V on the dorsal surface, 

 and two similar rows, or edges, of spinules on the ventral surface. 



Life-History. 



Insufficient work has thus far been done on the life-history of this 

 species to warrant saying more than that it is very similar to that 

 of F. guanicana. It probably differs in no essential detail. 



While the adults of this species appear in the earliest spring (in 

 the last days of February) their occurrence seems to extend over a 

 greater portion of the summer than does that of the other species, 

 for specimens may be found even as late as October. 



THE EGG. 



In size and appearance, the egg does not differ from that of /'. 

 guanicana, which has been described. The average length of the egg 

 stage, from a large number of observations, was ascertained to be 

 12.88 days, or practically 18 days, which is aliout the sanic as the 

 i'^^ stage of the other small Pln/Uophaga. 



THE WIIITE-GRUB, OK I.AKV \I, STAGE. 



The ascertained length of the first two instars of llic gnil) was 

 tlic same as for /'. guanicana, and it may be expected tliat tin- last 

 instar will also prove the same. 



First Instar. — From three grubs carried through this instar, the 

 average duration was 24 days, or exactly the same as tlie duratien 

 of that instar in P. guanicana. The only recorded measurement of a 

 first instar grub was: length, 18 millimeters: bi-eath of he;i(l. 1.4.") 

 )iiillimeters. 



161 



