42 R. Takalmslii 



Aphis petasiticola "■ sp. 

 ( PL IV, B, fig. 10) 



^^'ing'l(^ss vivi[)arons female. 



Blacliisb brown, not sliining. In a specimen treate<l witli eanstie potasli, some 

 blaekish patelios and spots are visible ou tbe dorsum. 



Eyes and cornicles black. Antennae black, paler at tlic base of the 3rd 'oint. 

 Femora black, Mith the bases pale brownisli; tibiae pale brown, with black apices; 

 tarsi black. Canda blackisli brown. 



Body stont. Head |>rovided with more tlian 10 long hairs on the dori-al 

 surface. Frontal tubercles almost lacking. Eyes not very large A\hen seen from 

 above. Ocelli present, as in tlie winged form, but mu(di smaller than those of tlic 

 winged viviparous female. Antennae long, more slender than the tibia, s miewhat 

 stout, imbricated, provided with many very long rather fine liairs; the 3rd joint with- 

 ont sensoria, the 5th with a sensorium of small size; tin relative length of joints as 

 follows: III-9.5, IV-65, V-57, VI-100 (30+70). Rostrum reaching the liind 

 coxae. Protliorax A^•ith a large blunt lateral tubei'cle. Abdomen reticulated on the 

 dorsum, the 1st and 7th segments ench provided with a l)lunt lateral tubercle, whicli 

 is almost as large as tliat ou the prothorax; a veiy small similar tubercle on eacli 

 of Ihe 2nd and 3rd s gments; with a few very long hairs on the dorsum and manv 

 similar hairs on the ventral surface. Cornicles long and slender, cylindrical, 

 scar(«ly or not curved, SomcMhat dilate 1 toward the base, usually not dilated at tlio 

 base, indirieated, not reticulated, almost as long as the 3rd antennal joint, nearly 

 twice as long as the canda. Cauda stout, more so than the cornicle, somewhat 

 constricted about the middle, almosi 1.5 times as long as the bafal part of the last 

 nntennal joint. Legs very long, stout, furnished Mith many very long fine hairs; 

 tibiae almost as stout as tlie cornicle at midlength; tarsi imbricated; hind tarsi almost 

 as long as the basal part of the last antenual joint. 



Length of body-about 2.2 mm. Antenna about 1.75 mm. 

 Cornicle-about 0.45 mm. 



It is a very remarkable fact that the wingless viviparous female, like the 

 Avingcd form, is provided with 3 ocelli which are small, but distinct. About 35 

 specimens that I have collected have these ocelli present. In some specimens the 

 3rd antennal joint is provided with about 5 very small circular sensoria scattered 

 almost throughout the -whole length, and the 4th with about 2 such sensoria. 



Winged viviparous female. 



