Dr. Grcvillc on some new species of Sargassum. 431 



the legs are long ; the knees are brown ; the feet and the tips of 

 the shanks are black. 



55. Aphis Frag ar ice , n. s. 



The viviparous wingless female. The body is pale green, oval, 

 and convex : the head is pale yellow : the feelers are also pale yel- 

 low, black towards the tips, and longer than the body : the eyes 

 are dark red : the month is pale yellow with a black tip : the nec- 

 taries have the same colour and are as long as one-h'fth of the 

 body : the thighs are pale green ; the shanks are pale yellow ; the 

 feet and the tips of the shanks are black. It much resembles 

 the preceding species, but the tubercles at the base of the feelers 

 are less developed; the feelers are longer than the body; the fourth 

 joint is shorter than the third ; the fifth than the fourth ; the 

 sixth is about one-third of the length of the fifth ; the seventh is 

 as long as the third. In the beginning of the spring it is 

 hatched from the eggs which are attached to the underside of 

 1 the leaves of the strawberry (Fragaria vesca) ; sometimes six eggs 

 and upwards are beneath one leaf. 



The viviparous winged female. It much resembles the wingless 

 female, but possesses the usual difference in structure, and in 

 the darker colour of the chest, &c. : the wings are like those of 

 the preceding species. — Variation in the veins of the wing. The 

 lower branch of the second fork is obsolete except at its source. 



The oviparous wingless female. This appears in November ; it 

 is rather smaller and more slender than the viviparous female ; 

 the abdomen is slightly produced at the tip, and the hind-shanks 

 are dilated. 



The winged male. It pairs with the oviparous female in the 

 middle of November ;. it much resembles the winged female, but 

 the head, the chest, the feelers, the tips of the thighs, and the 

 hind-thighs from the middle to the tips are darker. 



[To be continued.] 



XLIV. — Algce Orientales : — Descriptions of new Species belonging 

 to the genus Sargassum. By R. K. Greville, LL.D. &c* 



[Continued from p. 277.] 



[With a Plate.] 



WlGHTIANiE. 



7. Sargassum lanceolatum (nob.); caule angulato, ramosissimo ; 

 foliis lanceolatis, acutiusculis, minute dentatis ; vesiculis spha?- 



* Read before the Botanical Society of Edinburgh, November 9, 1848. 



