H. F. WILSON 101 



Aphis chrysothamni new species (Plate IX, figs. 15 to IS.) 



Collected at Salisbury, Oregon, during July, 1912 and 1914, 

 on Chrysothamnns lanceoJatvs Gr. This aphis is very abundant 

 on side hills along the canyons. General color green to red. 

 The young lice are green and the mature forms are red. 



Apterous viviparous female: General color: head dark wine red, pro- 

 thorax a lighter red and segment corresponding to metathorax greyish green; 

 abdomen light green, mottled with darker green and with a large dark green 

 spot in the center of the dorsum; last two segments covered with a greyish 

 powder. . In other stages the entire body assumes a pinkish tinge. Other 

 mature forms are wine red mottled with dark green. Antennae light 

 colored at the base, darker toward the tip; nectaries and cauda black. Body 

 broadly ovate. Antennae less than half as long as the body and apparently 

 without tubercles; thoracic segments with two pairs of lateral tubercles, the 

 front pair broad and rounded, the second pair more slender tind thumb-like 

 in shape. Abdomen with only one pair of apparent tubercles, which are 

 rather .short and are situated between the nectaries and the cauda. Nectaries 

 short and slightly tapering. In some cases they appear very slightly con- 

 stricted just back of the tip. Cauda very short and broadly pointed. 



Measurements: Length of body, 2.35 mm.; width, 1.62 mm. Length of 

 antennal segments: III, 0.33 mm.; 0.242 mm.; IV, 0.198 mm.; V, 0.198 mm.; 

 VI, 0.11 mm.; spur, 0.154 mm. Length of nectaries, 0.242 mm.; length of 

 cauda, 0.1 mm. 



Alate viviparous female: General color: antennae, head and thorax black; 

 abdomen green mottled with darker green ; legs black with tibiae dusky. Body 

 elongate and broad for its length. Antennae about two-thu-ds as long as the 

 body, the third segment with 4 to 6 large sensoria in more or less of a straight 

 line with each other; fourth with 4 to 7 sensoria. Wings with veins hairy and 

 dusky. Veins m^ and m^ form a fork rather shorter and smaller than usual. 

 Nectaries short and cylindrical. Cauda short, and ahnost triangular, tip 

 rather sharp. 



Measurements: Length of body, 1.55 mm.; width, 0.8 mm. Length of 

 antennal segments: III, 0.33 mm.; IV, 0.242 mm.; V, 0.22 mm.; VI, 0.135 mm.; 

 spur 0.198 mm. Length of nectary, 0.242 mm.; length of cauda, 0.11 mm.; 

 length of wing, 2.22 mm.; width, 0.8 mm. 



Macros! phum pteridis new species (Plate IX, figs. 19a to 19c.) 



Found throughout western Oregon on the fronds of Pteris 

 aquilina Linn. Very common but disappears almost entirely 

 from open places during heat of summer. Can be found in 

 shaded spots along hillsides at all times. 



Apterous viviparous female: General color yellowish white; legs dusky white 

 and antennae white except sixth segment and spur. Body long and medium 

 slender; antennae exceedingly long and slender; nectaries long, slender and 



TR.\NS. AM. ENT. SOC. XLI. 



