( 820 ) 



ruiiiirily sold l)\ S(;ui(liii;4fr as liciiij; tliis liylniil, if llicy really did iiol difter i'rimi 

 jio/iiili as stated by Staiidf'iiss and Staudiiiger, were doubtless true jiojjuli. Tiie 

 collector from wliotn Htaudiiiger received tbese " liybrids " may liave been taken in. 

 The name incersa of Tutt, I.e., refers to these specimens, not to the true hybrid 

 //ojj/di X ocellata. 



The ? poptili X ocellata kindly lent to ns by Standfuss agrees much better 

 with j)0})iiU than with ocellata. The eye-siiot of ocellata is represented by a 

 blai'kish shade.* The thorn at the end of the foretibia of ocellata is here vestigial. 

 The frenulum is reduced but distinct. The most remarkable feature of the specimen is 

 the antennae, which have rather long seriated ciliae, which is not the case in the 

 ? ? of either parent-sjiecies. Does this mean reversion to a former state of 

 development ? One of our two ? ? ocellata. x populi has similar antennae. 



The hybrid Mimas tiliae x Sphinx ocellata is a very interesting product 

 obtained by Professor Standfuss in some numbers. We have seven c?c? of this 

 hybrid. They come in a])pearance nearer the c? -parent than the ? -parent, but only 

 in iippearance. In structure they are decidedly nearer ocellata. As the structure 

 does not seem to have been closely oomiiared, we give the following results of our 

 investigation : 



1. In ocellata the foretibia ends in a jirominent thorn, which is absent from 



tiliae ; the hybrid possesses the thorn, though somewhat stunted. 



2. The tibiae are not spinose in ocellata and densely spinose in tiliae ; there 



are no spines in the hybrid. 



3. The pro.ximal pair of hindtibial spurs is absent from ocellata, and j)reseut 



in tiliae ; these spurs, in the hybrid, are absent, or are represented by two 

 small tubercles, or are distinct but shorter than in tiliae. The apical 

 spurs, which are much shorter in ocellata. than in tiliae, are intermediate 

 in the hybrid, both being sometimes of the same length. 



4. The retinaculum and frenulum are normal in tiliae, and vestigial respect- 



ively absent from ocellata. The hybrid agrees with ocellata in the 

 absence of a retinaculum, but has a long, thin, weak frenulum, 

 o. Sexual armature (only one specimen dissected) : the tenth tergite of the 

 hybrid stands intermediate between those of ocellata. and tiliae ; the harpe 

 is almost like that of ocellata, differing essentially from that of tiliae ; the 

 penis-sheatii has no armature, diifering from tliat of either parent-species. 

 llah. Europe as far west and north as Ireland, Scotland, Lapland ; southward 

 to Andalusia and Sicily ; eastward to the Ural, Transcaucasia, and Asia Minor. Not 

 found in Greece. 



In the Tring Museum a series of larvae and jiujiae and 40-odd specimens, 

 besides 1(5 c? c? and 2 ? ? ocellata x populi, and 1 ? populi x ocellata. 



h. Spli. ocellata atlaiiticas. 



Smerhithiis ocelhitd var., Lucas, Bull. Sue. Eiit. Fniiire p. 92 (1856) (Algorie). 



Smeiiiithus oiuAlutiix, Boisduval, Spec Gen. Lip. IIH. i. p. 31. n. 20 (1875) (partim ; Alge'rie). 



Smerhttliii.i ocellata, Oberthiir, /•;/. d'Eiit. vi. p. 65 (1881) (Oran). 



*Siuerinlhus atlanlirux Austaut, Le Natural, xii. p. 190 (1800) (Oudja) ; Kirby, Gi.t. Le/>. Het. i. 



p. 711. n. 2 (1892) (Morocco) ; Aust., /.-•. xv. p. 72 (1893) (larva) ; Rothscb., Nov. Zool. i. 



p. 98 (1894) (not distinct); Bartel, in Riihl, G rossi'rhm. ii. p. 178 (1900) (Algier, iv. ; Xord 



Morocco). 

 *liiiierinthns atliiiliais var. aexlivalU Austaut, I.e. xii. p. 191 (1890) : Bartel, I.e. p. 180 (1900). 



* This shade is very conspicuous in the second $ , which is now in the Tring Museum. 



