GRAPTA V. 



It appeared to me that Fabricius had described the female of this Umbrosa 

 as Interrogationis, and that the only doubtful jjoint was whether he had described 

 the corresjjonding male, or either sex of the other sj^ecies, as C aureum. But in- 

 asmuch as the name C aureum was pre-occupied, that subsequently given to the 

 female must extend to its male, and the other sjjecies whether really described by 

 Fabricius or not, should be regarded as unnamed. I therefore proposed for it the. 

 name Fabricii. 



As is well known, the larvae that produce these two forms are remarkably 

 variable. For several years I had endeavored to ascertain which type of larva 

 produced either species of imago or the sexes of either, but with no satisfactory 

 result, inasmuch as when I thought the matter determined by one series cf ob- 

 servations, the next perhaps would unsettle everything. 



On the 4th June, of this present year, (1871) I noticed two females Umbi-osa 

 flying about the hop-vines near my house, at Coalburgh, and had no difficulty in 

 capturing them. I enclosed them in a keg over a branch of the vine, covering 

 with a cloth. On the 6th, a large number of eggs had been laid, a few of which 

 were on the uj^j^er leaves of the vine, but the greater part on the cloth. On the 

 9th, they were hatching and I removed the larvse to the house and enclosed in a 

 breeding-cage. From these I obtained 18 clirysalids, which produced, on 3d July 

 and subsequent days, 11 Umbrosa, 5 <?, 6 ?, and 6 Fabricii, 1 <?, 5 ?. 



On the 29th July, and successive days till 5th August, I took eleven fe- 

 males of same type, no others being seen, and enclosed in same way as before. 

 From these I obtained hundi-eds of eggs, and separated the larvae therefrom into 

 three lots, one comprising those hatched from eggs laid on the cloths, one from a 

 large cluster laid on a single leaf, and all others in the third. By 3d Sej^tember 

 many imagos had appeared. From the eggs on cloth resulted 49, of which 29 

 were Umbrosa, 14 S, 15?, and 20 Fabricii, 11(?, 9?. From the leaf 8 Umbrosa, 

 5s, 3 ?, and 6 Fabricii, 4(^, 2 ?, and from the remainder 26 Umbrosa, 14 <?, 12 $, 

 and 8 Fabricii, 6 S, 2?. 



In each lot of larvae all the different ty]ies of coloration known to me were re- 

 presented, and there certainly is no connection between either of them and the 

 varieties or sexes of the imagos. 



These forms therefore are but one species, and so fer it would ajjpear that 

 the darker of the two was the type and the other a variety. But although 

 I have not been able to obtain females of Fabricii, and to determine this point 

 absolutely, yet from the fact that the two forms are invariably found together, 

 even where, as in many districts, Fabricii greatly out numbers Umbrosa, and from 

 the analogous case of Ajax, I believe that the eggs of Fabricii will also produce 

 both types of imago. If this be so neither can be considered as a variety of the 



