METRIOPTERA ROESELII. 167 



brown, ventral yellow. Anal segment excavated, 

 emarginate, lobes produced. Gerci rather slender, a 

 pronounced tooth nearer the apex than the base. 

 Subgenital lamina pale, slightly concave, acutely emar- 

 ginate, with a median carina, styles rather prominent. 



FEMALE IMAGO (PI. XI V, fig. 9). --In colour much as 

 in the male, in size a little larger. Elytra smaller, vein- 

 ing simpler; wings as small as in the male. Subgenital 

 lamina pale, deeply emarginate. Ovipositor short 

 (about 7 mm. long), turned sharply upwards, lower 

 edge gently curved, upper nearly straight, getting* 

 darker from base to tip which is slightly crenulated 

 along the edges, shining. Gerci without teeth. 



EGGS.- -In shape a curved cylinder with bluntly- 

 rounded ends ; about 4 - 25 mm. long by '75 mm. broad; 

 brown ; finely but regularly granulated. (Extracted 



j O / O 



from the body of a female sent alive from Trusthorpe 

 in 1912.) 



VARIATION.- -Very rarely the organs of night are 

 fully developed, but no instance has been noticed in 

 Britain. In coloration, that of the male appears to 

 be more constant than that of the female. The most 

 variable parts are the spots on the sides of thorax 

 and abdomen and the border of the side-flaps of the 

 pronotum : these may be light green, bright yellow, or 

 some intermediate tint. In some cases the median 

 longitudinal light line on the vertex of the head is 

 not evident : when present this may, or may not, be 

 continued on the pronotum. In some females bright 

 green is conspicuous in their scheme of coloration; in 

 others the colour as a whole is bright brown, the tint 

 of which may vary. 



NY AJ PH.- -Two dried examples that I possess, except 

 for the smaller size and less developed organs of flight, 

 much resemble the adult form; but nymphal grass- 

 hoppers alter in drying much more than do the adults. 

 A female nymph taken by Luvoni on 28 August was 

 very green indeed, and a brighter green tint seems to 



