98 TMay, 



Briefly summarized : — 



No. 1 — Mine large and angular, frass a central thread throughout ; 

 larva greenish-white, with pale head and dark cephalic ganglia. 



Lafponica — Mine large and angular, frass a central thread in the 

 last portion and coiled in the middle portion ; larva yellow, with 

 blackish head and brown and inconspicuous ganglia. 



Qontinuella — Mine large, greenish, and filled with coiled frass ; 

 larva green in the mine but yellow out, with pale head and no other 

 visible markings. 



Distinguenda — Mine small, brown, and filled with coiled frass ; 

 larva yellow, with black head, a chain of black linear marks down the 

 middle, and a pair of black lines at the hinder end. 



Betulicola — Mine small, usually about half filled with irregularly 

 arranged frass ; larva yellow, with brown head and chain of inconspi- 

 cuous brown linear marks, but no trace of any dark lines at the hinder 

 end. 



Luteella — Mine small, usually nearly filled with irregularly ar- 

 ranged frass ; larva yellow, with pale head and no other visible 

 markings. 



Thus, then, these six mines, all much alike in many ways, and all 

 occurring in the same kind of plant, can be identified when full with 

 the greatest readiness, and even in dealing with them when empty 

 equal certainty can be felt as regards four out of the six. Whether 

 Mr. Fletcher's Sussex species will throw in a note of discord as it half 

 threatens to do, time alone will show, though I cannot but think that 

 either mine or larva will offer some point or other by which we may 

 learn to know it. 



(Jb he continued). 



ABUNDANCE OF PYRAMEIS CAEDUI, L., IN THE ZIBAN, ALGEEIA. 



BT THE BEV. A. E. EATON, M.A., E.E.S. 



At the base of the Aures and south of the Hodna, in Eastern 

 Algeria, the Ziban, with Biskra as their chief town, form the northern 

 border of the Sahara. The country, hilly in parts and diversified with 

 shallow irregular valleys, slopes gently towards the open desert, which 

 viewed in clear weather fi^om afar looks as blue and level as the sea ; 

 dark patches, like low islets, in the broad expanse are oases with 

 palms. The valleys referred to are most of them waterless, excepting 

 perhaps for a day or two after heavy rain once or twice in a winter. 



Just as March was ending, a spell of Mediterranean weather, 



