H. F. WILSON 93 



broadly oval, pointed at the tip and with a row of 4 or more blunt tubercles 

 along the side of the abdomen. Nectaries slightly tapering and curved; cauda 

 short, broad at the base and tapering to a rounded tip. 



Measurements : Length of body, 1.71 mm. ; width of body, 1.11 mm. Length 

 of antennal segments; III, 0.242 m.m.; IV, 0.22 mm.; V, 0.176 mm.; VI, 0.135 

 mm. ; spur, 0.242 mm. Length of nectaries, 0.42 mm. ; length of cauda, 0.09 mm. 



Alate viviparous female: General color of head and thorax black; abdomen 

 greyish brown tinged with wine red. Antennae dusky yellow at base, black 

 at the tip. Legs with middle of tibiae and femora dusky yellow; remaining 

 parts black. Nectaries dusky red; cauda yellowish at the base, black at the 

 tip. Antennae reaching to the base of the nectaries, third segment with 4 or 

 5 large sensoria. Prothorax with a single finger-like tubercle at the base of 

 each side. Just back of that and apparently between the prothorax and the 

 mesathorax on each side is a larger and broader tubercle or hump. Abdomen 

 with a number of large tubercles along the side, two of which are finger-hke 

 projections one on each side midway between the nectaries and the cauda. 

 Wing venation normal, nectaries tapering, smaller at the base than at the 

 tip and reaching to the base of the Cauda. Cauda short and tapering, tip 

 bluntly rounded. Caudal plate broad and shghtly rounded. 



Measurements: Length of body, 1.34 mm.; width, 0.67 mm. Length of 

 antennal segments: III, 0.242 mm.; IV, 0.154 mm.; V, 0.154 mm.; VI, 

 0.11 mm.; spur, 0.176 mm. Length of nectaries, 0.198 mm.; length of cauda, 

 0.11 mm. Length of wing, 2.22 mm.; width, 0.33 mm. 



Aphis hermistonii new species (Plate VII, figs. 18 to 25.) 



First taken at Hermiston, Oregon, 1912; later taken at Klamath 

 Falls and other points in eastern Oregon. Found on Artemesia 

 tridentata. 



Apterous viviparous female: General color dark green, body flecked with 

 patches of whitish powder. Antennae dusky yellow at the base, black toward 

 the tip. Legs, nectaries and cauda dusky to black. Antennae not quite 

 reaching to the base of the nectaries. Third segment with one sensorium 

 and this is lacking in a great many individuals. Prothorax with a single well 

 developed finger-like tubercle on each side. Abdomen with four large tuber- 

 cles, two on each side. The first two are found one on each side of the abdomen 

 near the thorax. The other two are found half way between the nectaries 

 and the base of the cauda. Nectaries cyHndrical with the tip much broader 

 than the nectary proper. Cauda short and tapering. 



Measurements: Length of body, 1.35 mm.; width, 0.777 mm. Length of 

 antennal segments: III, 0.176mm.; IV, 0.154 mm.; V, 0.156mm.; VI, 0.11 mm.; 

 spur, 0.18 mm.; length of nectaries, 0.35 mm.; length of cauda, 0.66 mm. 



Alale viviparous female: General color head and thorax black; abdomen 

 dark green with scattered spots of white powder; antennae, legs, nectaries 

 and cauda dusky or black with a greenish tinge. Antennae not quite reaching 

 to the base of nectaries. Third segment with 4 or 5 large sensoria. Pro- 

 thorax with tubercles as in the apterous form and aljdomen with a single large 



TRANS. AM. ENT. SOC, XLI. 



