H. F. WILSON 107 



Aphis hermistonii new species, alate viviparous female: fig. 18, antenna; 

 fig. 19, third antennal segment (much enlarged) ; fig. 20, prothoracic tubercles; 

 fig. 21, nectary; fig. 23, cauda. Apterous viviparous female: fig. 22, nectary; 

 fig. 24, Cauda; fig. 25, tubercles along the side of the abdomen. 



Aphis tridentatae new species, alate viviparous female: fig. 26, antenna; 

 fig. 27, speciahzed seta; fig. 28, frons; fig. 29, cauda; fig. 30, nectary, 



Plate VIII 



Macrosiphum ludovidanae Oestlund, alate viviparous female: fig. 1, 

 antenna; fig. 2, third antennal segment (much enlarged) ; fig. 4, nectary; fig. 5, 

 cauda. Apterous viviparous female: fig. 3, third antennal segment (much 

 enlarged) . 



Macrosiphum artemesiae Boyer, alate viviparous female: fig. 6, antenna; 

 fig. 7, third antennal segment much enlarged and showing specialized setae; 

 fig. 8, nectary; fig. 10, cauda. Apterous viviparous female: fig. 9, third anten- 

 nal segment (much enlarged). 



Macrosiphum artemesicola Williams, alate viviparous female: fig. 11, 

 antenna; fig. 12, nectary; fig. 13, frons; fig. 14, speciahzed setae; fig. 15, cauda. 



Aphis artemesicola Williams, apterous viviparous female: fig. 16, antenna; 

 fig 17, third antennal segment (much enlarged) ; fig. 18, nectary; fig. 19, cauda. 



Aphis frigidae Oestlund, apterous viviparous female: fig. 20, antenna; 

 fig. 21, nectary; fig. 22, frons; fig. 23, specialized seta; fig. 24, cauda. 



Plate IX 



Amphorophora subterrans new species, alate viviparous female: fig. 1, 

 antenna; fig. 2, nectary; fig. 4, cauda. Apterous viviparous female: fig. 3, 

 third antennal segment. 



Macrosiphum menlzeliae new species, alate viviparous female: fig. 5, 

 antenna; fig. 6, nectary; fig. 8, cauda; fig. 9, capitate hair. Apterous vivi- 

 parous female : fig. 7, third antennal segment. 



Aphis lithospermi new species, alate viviparous female: fig. 10, antenna; 

 fig. 11, nectary; fig. 12, cauda; fig. 14, abdominal tubercles. Apterous vivi- 

 parous female: fig. 13, nectary. 



Aphis chrysothamnii new species, alate viviparous female: fig. 15, antenna; 

 fig. 16, nectary; fig. 17, cauda. Apterous viviparous female: fig. 18, nectary. 



Macrosiphum pteridis new species, alate viviparous female: fig, 19a, 

 antennae; fig. 19b, cauda; fig. 19c, nectary. 



Plate X 



Lachnus oregonensis new species, alate viviparous female: fig. 1, wing; 

 fig. 2, beak; fig. 3, hind leg; fig. 4, nectary ; fig. 5, antenna; fig. 7, tip of abdomen; 

 fig. 8, prothoracic segment. Apterous viviparous female: fig. 6, antenna. 



TRANS. AM. ENT. SOC, XLI. 



