ao2 PHYSIS (V, 1923) 



Morphological characters : Elongated pyriform. Dorsum provi- 

 ded with transverse series of piliferous tubercles. Venter also with 

 piliferous lubercles but they are smaller, and disposed in double 

 series. Antennae with segment III provided with hairs that are 

 sub-equal in lenght lo 3/4 its máximum breadth and with from 

 1 Ti lo :íj subcircular sensoria scattered over its eulire length. Im- 

 briealion faint on V, stronger on VI, and filament; first four seg- 

 menls smoolh. Rostrum short, reaching second coxae with its tip. 

 Cornicles rather stout, provided with polygonal imbrications on 

 distal i/4 where it expands gradually; apex very slightly dilated. 

 Cauda sub-ensiform , slightly constricted near base with about 4 

 pairs of lateral and 7 dorsal bristles. 



Relat'we measarements : 



Length 2 .3o 



Width i .00 



f. t. 1 11 m iv v vi f. 



Antennae 0.08 o.i5 0.08 o. 64 o. 5a 0.42 0.16 0.77 



Cauda. o. 36 



Cornicles o. 46 



jst 2 nd 3 rd 



/Femora... 0.61 0.61 0.80 



Legs ] Tibiae ... 1.02 1.09 i.48 



\ Tarsi. . . . . 0.12 o.i3 o.i4 



Rostrum. o. 43 



Álate virgogene unknown. 



Hab. Described from specimens taken from the underside of the lea- 

 ves ofan undetermined species of Composite. (G. R. Huidobro, col.) 

 in Lomas de Zamora (prov. Rueños Aires). Types in my collection. 



Obs. The length of the rostrum and thecharacter of the recticulations 

 on tip of cornicles, at once sepárate this species from its argentine con- 

 geners. 



Macrosiphonielia chrysanthemi Del Guercio (fig. 9) 



Apterous virgogene. 



Color : Dark reddish-brown to brownish-black. polished. Eyes 

 brown. Antennae blackish with III, except at its tip, and base of IV 

 palé to yellowish. Legs yellowish with coxae, trochanters, distal 2/3 

 offemora, tips of tibiae and tarsi blackish. Cauda, cornicles and 

 anal piale, blackish. Genital píate brownish. Rostrum blackish. 



