44 



differential character in closely allied species. The anal 

 tube is always accompanied by the subscaphium, which is 

 partly covered by small spines. The plate of the eighth 

 segment varies considerably in shape and structure. It 

 arises interiorly from the sternite, often as a free plate, 

 and sometimes comes to the surface where it becomes 

 highly chitinised; at other times it is fused to the skin of 

 the sternite, and is a mere thickening of the chitine. 

 Dr. Buchanan White appears to have been the first to call 

 attention to this important character, and it has been sub- 

 sequently used by Dr. W. Petersen in his monograph of 

 the Eupithecice. The juxta is a hard, rounded, chitinous 

 plate, with two arms projecting from above. The cornuti, 

 of which there are often four sets, are of immense import- 

 ance, but here again the difficulty of obtaining the same 

 position renders them of less value than they would other- 

 wise be. Coremata on the ninth segment. The female 

 as a rule has good distinguishing characters. 



Eupithecia oblongata, Thnb. 33 



Valva emarginate on the outer edge; harpe raised, hairy. 

 Cornuti weak, striated, and appear to consist of two pieces. 

 Goremata short, hairs long. Saccus indent. 



Ostium strong. Ductus bursse elaborate. Burea 

 instrate. 



Pusillata, Fb. 63 



Valva emarginate on outer edge. Cornuti three sets, one 

 long, scobinate above; one bulbed spine; one small spine. 

 Coremata truncate, hairs few, long. Saccus slightly 

 indent. 



Ostium strong. Ductus bursse short. Bursa panni- 

 cular, the upper teeth being large and strong. 



Distinctaria, H.-S. 



Const rictata, Gn. 22 



Valva emarginate on outer edge. Cornutus long, delicate. 

 Coremata globular, hairs long. Saccus rounded. 



'Ostium weak. Ductus bursse weak. Bursa pannicular. 



