202 Mr. F. Walker's Descriptions of Aphides. 



more obtuse; the distance between the first and the second 

 branches at the base is more than half of that at the tips ; the 

 third vein is forked long after one-third, and again after two- 

 thirds of its length. The young ones are twelve and upwards 

 in number. 



48. Aphis Absinthii, Linn. 



Aphis Absinthii, Linn. Syst. Nat. ii. 735. 19; Faun. Suec. 

 990; Gmel. ed. Syst. Nat. i. 5. 2206. 19; Fabr. Mant. Ins. ii. 

 315. 19; Ent. Syst. iv. 214. 20; Syst. Rhyn. 297. 20; Scop. 

 Ent. Carn. 137. 401 ; Mull. Zool. Dan. Prod. 1270; Schrank, 

 Faun. Boic. ii. 123; Burm. Handb. Ent. ii. 95. 4; Kalt. Mon. 

 Pflan. i. 31. 19. 



Aphis Tanaceti, Linn. Syst. Nat. ii. 735. 18 ; Faun. Suec. 

 989 ; Gmel. ed. Syst. Nat. i. 5. 2205. 18 ; Fabr. Sp. Ins. ii. 387. 

 31 ; Mant. Ins. ii. 316. 36 ; Ent. Syst. iv. 217. 36 ; Syst. llhyn. 

 299. 36; Geoff. Ins. i. 496. 8; Schrank, Faun. Boic. ii. 123. 

 1241 ; Burm. Handb. Ent. ii. 14. 3; Kalt. Mon. Pflan. i. 47.- 

 33 ? Sir Oswald Mosley, Gard. Chron. i. 684. 



Aphis Balsamitce, Mull. Zool. Dan. Prod. 109. 1252; Gmel. 

 ed. Syst. Nat. i. 5. 2210. 71. 



Aphis Artemisia, Fonscol. Ann. Soc. Ent. Fr. x. 162. 1. 

 1 Aphis Tanacetaria, Kalt. Mon. Pflan. i. 19. 8. 



Aphis Tanaceticola, Kalt. Mon. Pflan. i. 33. 21. 



Absinthifex, Amyot, Ann. Soc. Ent. Fr. 2 me serie, v. 475. 



Tanacetifex, Amyot, Ann. Soc. Ent. Fr. 2 me serie, v. 476. 



This species feeds during the summer arid autumn on Artemi- 

 sia vulgaris, A. Absinthium, A. Abrotanum, Tanacetum vulgar e, 

 and Balsamita vulgaris. 



The viviparous wingless female. The body is elliptical, convex, 

 green, thickly covered with white powder, and thus resembling 

 in colour the underside of the leaf on which it feeds* : the feelers 

 are black, yellow at the base, and as long as the body, or much 

 longer ; the third and the fourth- joints are rather hairy ; the 



* Perhaps this insect or a nearly allied species is mentioned in the fol- 

 lowing extract : — " One of the prominent characteristics in the face of the 

 country in the region of the Rocky Mountains is the extraordinary abundance 

 of the Artemisia, absinthe, or prairie-sage as it is variously called. It has its 

 small fly of the same hue accompanying it through every change of elevation 

 and latitude. It grows everywhere — on the hills, and over the river-bottoms, 

 in tough, twisted, wiry clumps, and glitters like silver as the southern breeze 

 turns up its leaves to the sun. As the country increased in elevation on our 

 advance to the west, they increased in size ; and the whole air was strongly 

 impregnated and saturated with the odour of camphor and spirits of turpen- 

 tine which belongs to this plant. This climate has been found very favour- 

 able to the restoration of health, particularly in cases of consumption ; and 

 possibly the respiration of air so highly impregnated by aromatic plants may 

 have some influence." (Report of Capt. Fremont's Exploring Expedition to 

 the Rocky Mountains, Oregon and North California, in the years 1842-44.) 



