NOTES ON BALTIA AND MESAPIA. 127 



the cell. Moore, in founding the genus Baltia on the same 

 insect (Ann. & Mag. Nat. Hist. 1878, p. 228), disposes of this 

 fiction, and describes the venation accurately enough, but in 

 language which might not seem quite clear to students accus- 

 tomed to deal with the veins on the numerical system. As a 

 matter of fact, veins 5, 6, 7 and 8 are stalked from the upper 

 angle of the cell in the male, and in the female vein 5 arises at 

 or just beyond the upper angle of the cell ; the five subcostal 

 branches of which Moore speaks are present in all the specimens 

 which I have examined, — that is to say, vein 8 is present but 

 extremely short, as in typical Pieris ; indeed, the position of 

 vein 5 in the fore wing (which is the same as Moore's radial 

 branch of the subcostal) is the main feature, in point of venation, 

 which separates Baltia from Pieris. A few other Pierid genera 

 have nearly or quite the same position of vein 5 in the fore wing, 

 but they are otherwise widely separated from Baltia. These 

 are — Pseudopontia, Plotz, a curious African genus, with the cell 

 not more than one-third as long as the fore wing, and veins 5, 6 

 and 7 stalked ; Elodina, Feld., a genus found principally in the 

 Australian region, in which vein 5 springs from the upper angle 

 of the cell, and 6, 7 and 8 are stalked, but vein 8 is given off 

 about midway between the upper angle of the cell and the base 

 of vein 7 ; Phi/llocharis, Schatz, in which vein 5, the stalk which 

 bears veins 6, 7, 8 and 9, and vein 10, all spring from the upper 

 angle of the cell ; and PJiulia, H.-S., in which vein 5 and the 

 long stalk which bears veins 6 and 7 spring from the upper angle 

 of the cell. Moore's expression, " allied to Mesajna," is mis- 

 leading with regard to the genus Baltia : allied to Mesapia it 

 undoubtedly is, in that both p)cloria, Hew., and shaivii, Bates, are 

 Pierids ; but there the alliance ends, as the two insects are very 

 distinct both in facies and venation. 



Dr. Dixey {in litt.) does not share Mr. Kirby's opinion {ante, 

 p. 100), that the specimens in the Hope collection at Oxford are 

 so different from Groum-Grshimailo's figures of Pieris shawii 

 (Eom. Mem. sur. Lep. p. 222, 1. 10, fig. 2, a, h) that they probably 

 represent a distinct but allied species. 



Synchloe hutleri, Moore, agrees with shaicii in point of vena- 

 tion, save that the disco-cellulars of the hind wing are much 

 more oblique, and the cell, consequently, more pointed. 



Pieris peloria, Hew., is, for all practical purposes, s,nAporia; 

 that is, if hippia, Brem., is to be regarded as an Aporla ; but if 

 the latter name be restricted to cratcegi, L., then the name 

 Mesapia might be applied to those Aporias in which the hind 

 wing below is yellow or yellowish, with the veins more or less 

 broadly margined with black. It would tben include hippia, 

 Brem., martineti, Ob., goutelli, Ob., hieti, Ob., &c. 



Mr. Kirby's description of the venation of the fore wing in 



l2 



