92 APHID NOTES 



Aphis reticulata new species (Plate VII, figs. 1 to 7.) 



On Arte7nesia tridenfata, Klamath Falls, Oregon, July 9, 1914, 

 and in company with M. frigidae Oestlund. 



Apterous viviparous female: General color brown. Antennae black at the 

 tip and shading to dusky at the base of the third segment. Segments one and 

 two brownish opaque. Legs dark brown except at the base of the femora; 

 nectaries and Cauda dark bro\«i to black. The important character of this 

 species is the reticulation found over the entire body. The structure of the 

 outer sheath of the antennae is unusually different in that it seems to be made 

 up of numerous small ridges which gives an additional opaqueness and after 

 clearing they can hardly be seen through. Antennae not quite as long as the 

 body and on slight tubercles. The nectaries slightly tapering and slightly 

 curved inward, no reticulations are found at the tip. Thorax bears a single 

 finger-hke tubercle on each side and the abdomen with others, a large pair 

 just back of the thorax. Cauda shghtly more than half as long as the nectaries 

 and tapering to a blunt rounded point. 



Measurements: Length of body, 1.72 mm.; width, 0.88 mm. Length of 

 antennal segments: III, 0.49 mm.; IV, 0.24 mm.; V, 0.2 mm.; VI, 0.11 mm.; 

 spur, 0.33 mm. Length of nectaries, 0.49 mm.; length of cauda, 0.18 mm. 



Alate viviparous female: General color of head, thorax, antennae and legs, 

 black. Abdomen dark brown. Antennae reaching to the base of the nec- 

 taries, third segment with about 40 irregular, raised sensoria. Ocular tubercles 

 unusually prominent. Prothorax with a single finger-hke tubercle on each 

 side. Abdomen with tubercle above base of hind pair of legs. Nectaries 

 reaching beyond the tip of the cauda, cyhndi'ical and tips slightly bent out- 

 ward and downward. Cauda tapering, curved upward and blunt at the tip. 



Measurements: Length of body, 1.5 mm.; width, 0.58 mm. Length of 

 antennal segments: III, 0.4 mm.; IV, 0.2 mm.; V, 0.22 mm.; VI, 0.11 mm; 

 spur, 0.35 mm. Length of nectaries, 0.31 mm.; length of cauda, 0.154 mm.; 

 length of wings, 3.1 mm.; width, 1.04 mm. 



Aphis oregonensis new species (Plate VII, figs. 8 to 17.) 



Collected at Klamath Falls, Oregon, July 8, 1913, on Artemesia 

 tridentata. 



A peculiar condition of the plant Avas found in connection with 

 each colony of this species. In every instance the stem of the 

 plant had been broken and bent over. There were indications 

 present that some insect had almost eaten away the stem at 

 that point. 



Apterous viviparous female: General color, greyish brown tinged with wine 

 red. Nectaries with the first four and the basal half of the fifth segments 

 yellow, remaining parts black. Legs, except the tip of the til)iae and the tarsi, 

 yellowish; rest black. Nectaries and cauda black. Antennae about one-half 

 the length of the body. Prothorax with a single blunt tubercle. Abdomen 



