164 THE ENTOMOLOGIST. 



induced Mr. Bateson to take "discontinuous" variation for his 

 first study. We may hope that by giving us a second volume he 

 will illustrate practically the value of continuity, and also help 

 us to realise more clearly than we do at present in what way con- 

 tinuous differs from discontinuous variation. 



The book is provided with excellent indexes, which add very 

 considerably to its value. 



D. S. 



THE GENUS PHILOMETRA, Grote. 

 By John B. Smith. 



In the 'Entomologist' {ante, pp. 97-99) Mr. Butler makes 

 some remarks under the above caption, involving a criticism of 

 my ' Catalogue,' and of some statements made in it. 



I have just completed a monographic revision of the American 

 species of Deltoids, in which the characters of all the genera 

 are fully worked out ; hence I will not discuss them here at any 

 great length, but will confine myself to such admissions and 

 explanations as Mr. Butler's remarks seem to make necessary. 



To make one portion of the criticism clear, I reproduce the 

 citations especially referred to, just as they stand : — 



P. GOASALIS, IVlk. 



1859. Wlk., C. B. Mus., Het. xvi. 134, Epizeuxis. 

 1859. Wlk., C. B. Mus., Het. xix. 876, Epizeuxis. 



metonalis, Wlk. 

 1859. Wlk., C. B. Mus., Het. xvi. 236, Horminia, 



longilahris, Grt. 



1872. Grt., Trans. Am. Ent. Soc. iv. 99, 309, Philometra. 



1873. Grt., Bull. Buff. Soc. Nat. Sci., i. 40, Philometra. 



This is the plan of the entire Catalogue, and it gives first, in 

 full-faced type, the name of the species, centred. Next follow 

 the references, each occupying a full line, beginning with the 

 date and ending with the generic term used by the author cited. 

 Next follow the synonyms, if any ; a full line devoted to each 

 name, which is flush and printed in italics. Under each 

 synonym follows its bibliography, exactly as under the original 

 species, and the last citation to each such name is that in which 

 it is made a synonym. Where no such citation occurs it indi- 

 cates that the reference is original in the Catalogue. I must 

 confess this seems very clear to me, and I have not heretofore 

 found anyone that failed to understand the plan of the Catalogue 

 in the way Mr. Butler seems to have done. AH my monographic 

 works for the few years last past have been on the same plan as 



