302 THE CANADIAN ENTOMOLOGIST. 



A NEW APHID FROM OREGON.* 



BY H. F. WILSON, CORVALLIS, OREGON. 



Lachmis pseudoistigœ., n. sp. 

 Stem-mother. — Collected on terminal shoots of Pseudotsuga douglassii 

 about Corvallis, Oregon, March i5ih, 1911. 



General colour light brown with two rows of black spots extending 

 midway along the dorsum to the middle of the abdomen. These spots 

 sometimes join so as to give the appearance of two dark lines extending 

 along the body. Body semi-shining and with faint traces of a light flaky 

 powder on dorsum. Legs and antennae dusky brown. After having been 

 mounted on slides for some time this species turns red and a deep red 

 colour is assumed by the balsam surrounding them. The abdomen is quite 

 large in comparison with the head and is almost globular. Antennae VI 

 segmented, and about one-fifth the length of the body. The nectaries are 

 but small round tubes slightly elevated ; they are about as wide as long 

 and are situated on the side of the abdomen about two-thirds of the way 

 from the base of the thorax to the base of the cauda. Cauda broad and 

 slighily angled, very short. 



Measurements: Length of body, 3.8 mm ; width 2.99 mm.. Length 

 of antennal segments, I, .09; II, .09; III, .3; IV, .135; V, .135; VI, .12; 

 spur, .045 mm.; total length, .87 mm. Length of cauda, .3 mm; 

 nectaries, .022 mm. 



Spring migrant. — Ccllected June 4, 19 11, on terminal shoots of 

 same host plant. General colour of head and thorax dark or dusky. 

 Abdomen greenish brown, with colouring of white powder. Legs and 

 antennae, except tarsi and tips of third, fourth, fifth and sixth segments, light 

 brown. Other parts dusky to black. Antennae about one-fourth the length 

 of the body. Head rounded in front and with a suture or line extending 

 from back to front midway between antennae. Wings hyaline. The first 

 anal and cubital veins quite distinct while the median with its two branches, 

 remains only as faint lines. The nectaries of this form are cone-shaped 

 with a flanged mouth and are apparently not placed as far forward as in 

 the earlier forms. Cauda short and broadly angular. 



*We regret that, owing to a printer's error, which escaped us, the present 

 desciiption of Lachniis pseudotsugae viSiS published in the June number of the 

 Canadian Entomologist (pp. 192) without the name. We therefore republish the 

 description in full with the name added. 

 October, 1912 



