H. F. WILSOX 97 



Measurements: Length of body, 2.11 mm.; width, 0.95 mm. Length of 

 antennal segments: III, 0.86 mm.; IV, 0.75 mm.; V, 0.73 mm.; VI, 0.15-i mm.; 

 spur, .122 mm. Length of nectaries, 0.644 mm.; length of Cauda, 0.154 mm.; 

 length of wing, 3.11 mm.; width, 1.11 mm. 



Macrosiphum artemesiae Boyer ^^ (Plate VIII, figs. 6 to 10.) 

 Siphonaphora frigidae Oestlund.^'' 

 Nectarophora artemesiae Cowen. ^^ 

 Nectarophora coiceni Hunter. " 



This species is found in all sections of Oregon where Artemesia 

 tridentata grows. It has been collected in a very isolated patch 

 of this plant on top of Grays Peak, Grant County, Oregon, eleva- 

 tion about 7000 feet. It apparently does not occur in the Wil- 

 lamette valley. Two forms of this species are generally found, 

 one a dark shining green and the other a light moss green. Both 

 forms are found together on the same plant, and in late July 

 colonies of the lighter form may be found separate from the 

 others. The following description is made from the dark form: 



Apterous viviparous female: General color dark metallic green; legs and 

 antennal black except the basal parts of the femora, and the first, second and 

 a part of the third antennal segments. Eyes, nectaries and cauda black. 

 Antennae longer than the body, third segment with from six to nine irregular 

 round sensoria. Nectaries long, stout, tapering, and reaching bej^ond the tip 

 of the Cauda. Each nectary with about four capitate setae. Cauda long, 

 heavy, broadly pointed and ensiform. Nectaries reticulated for a very short 

 distance back of the tip. The chief character of this species is the capitate 

 hairs which are found sparsely over the body. 



Measurements: Length of body, 2 mm.; width, at widest part of abdomen, 

 1.25 mm. Length of antennal segments: III, 0.74 mm.; IV, 0.6 mm.; V, 0.5 

 mm.; VI, 0.154 mm.; spur, 0.8 mm. Length of nectaries, 0.73 mm.; length of 

 Cauda, 0.30 mm. 



Alate viviparous female: General color, head and thorax shining black. 

 Abdomen shining dark green. Antennae except base of third segment and 

 legs except base of femora black; eyes, nectaries and cauda also black. Anten- 

 nae longer than the body and on strong gibbous tubercles. Third segment 

 with 11 to 15 visible round irregular sized sensoria, fourth with about seven 

 and fifth and sixth with usual number. It is impossible to make out all of the 

 sensoria on the third and fourth segments without clearing. Wing venation 



"Ann. Soc. Ent. France, X, p. 162, 1841. 



^ Fourteenth Ann. Rcpt. Geol. and Nat. Hist. Survey Minn., 18S6, p. 20. 



" Colo. Agl. Exp. Sta. Bull. 31, Tec. Ser. 1, p. 123, 1895 (Mr. L. C. Bragg 

 wTites me that Cowen's species is the same as that of Oestlund.) 



1^ Iowa Ex. Sta. Bull. 60, 1901, p. 114, A new name for N. artemesiae 

 Cowen, which is preoccupied. 



TRANS. AM. ENT. SOC, XLI. 



