284 THE entomologist's record. 



larva?, which probably very largely wander off to the rougher ground 

 to pupate before the ground is again disturbed. Some such condition 

 as this seems to be what makes T. ballus so plentiful here. I was, 

 however, a little surprised to find in one at least of the woods here 

 that this insect was in fair numbers in the wood, a long way from 

 cultivation, whenever there was any little open space beside a 

 path. And a word as to the foodplant. Every one knows that 

 the foodplant is Lotus JiisjndHs, and there is much in a name. 

 Mr. Raine knows the plant and its allies very well, and to him 

 I am indebted for my knowledge of them. Some other ento- 

 mologists, however, who have recently approached the question 

 have fallen into an error, which is a very natural one, and may be 

 really of much older date than I am aware of. The favourite food of 

 T. halliis at Carqueiranne is a very hispid Lottij<-lookmg plant, and so has 

 been accepted as Lotii>i /aspirins. It is, how^ever, not a Lotus at all, but 

 Anthyllis tetrajihj/Uus. Lotus hispidiis also grows freely at Carqueiranne. 

 I have found eggs of T. hallits on both these plants, perhaps more 

 abundantly on the Anthyllis. There are also many other allied 

 leguminous plants at Carqueiranne on which, probably, T. ballus 

 would be able to exist. The Lotus hispichis is very closely allied to L. 

 rnrniculatus, so that it is clearly b}' no means a matter at all remark- 

 able that it feeds so comfortably on that plant as a substitute. Apart 

 from correcting the mistake fallen into by some recent investigators of 

 T. ballus, I wish to call attention to the fact that Anthyllis tctrajihyllus 

 is the foodplant of T. ballus, not only equally with, but perhaps more 

 especially than, L. hispidus, at least at Carqueiranne. 



Description of Plate XI. 



1. Pupa of T])Cf!tor ballus — dorsal, ventral, and lateral views (natural size). 



2. Eggs of Thc.itor hallun on Aiithyllix tetraphyllus (x22). 



3. Fullfed larvae of Thestor halliis on Lotus corniculatus, June 6tli, 1903 

 (natural size). 



Description of Plate XII. 



1. Larva of Thestor ballus (1st stadium) x 28. 



2. ,, ,, ,, ,, x20. 



3. ,, ,, ,, (2nd stadium) X 20. (Reproduced badly.) 



4. Pupa of Thestor ballus — dorsal, ventral, and lateral views x 2. 



Description of Plate XIII. 



1. Diagram showing arrangement of books on prolegs of Thestor ballus. 



2. Form of book of true leg. 



8. Transverse section of lai'va (diagrammatic) to show depth of division 



between two lateral flanges. 

 4. Diagram showing depressed position of prothoracic plate and eye-like effect 



of spiracles. 

 •'>. Structure of larval hair. 

 6. Markings of prothoracic plate. 



[Plates XI and XII are from photographs by A. E. Tonge, Esq.] 



On some northern Spanish Geometrides. 



By LOUIS B. PEOUT, F.E.S. 



For a third time in succession (cfr. Ent. Rec, xiv., pp. 198-202; xv., 

 pp. 96-98) I have had the pleasure of working out a collection of 

 Spanish Geometrides. Dr. Chapman having once again been kind 

 enough to collect them for me during his visit to the north of the 



