104 APHID NOTES 



Lachnus rubicundus new species (Plate XI, figs. 8 to 14.) 



Found on Juniperus occidentalis along the dry ridges of eastern 

 Oregon. Specimens not very abundant and would probably 

 escape being seen if it were not for the ants running about over 

 the infested twigs. Only two alate forms taken in a half day's 



search. 



Apterous viviparous female: General color, when young, light brown or pink; 

 later they become covered with powder except a thin streak do\ra the center 

 of the back. Along each side of the abdomen and dorsally placed may be 

 found a row of black dots, one to each segment. The first and largest are 

 found on the prothoracic segment, the others growing smaller toward the end 

 of the body. Below these and on the side may be found still another row of 

 dots. As the aphids grow larger the spots become hidden under a fine white 

 or pinkish pruinose covering. This powder with the browai body of the insect 

 gives a decided pinkish appearance. Other stages or forms are dark brown 

 mottled with black. 



The body is exceedingly robust and globose. The antennae reach to about 

 the second pair of legs and both legs and antennae are set with fine short 

 hairs. The third and foiu-th antennal segments appear to be without sensoria; 

 the fifth and sixth segments bear one each. The nectaries are broad and 

 rounded without much depth. The cauda is broadly rounded. 



Measm-ements : Length of body 3.55 mm. ; width, 2 mm. Length of anten- 

 nal segments: III, 0.44 mm.; IV, 0.135 mm.; V, 0.22 mm.; VI, and spur, 0.135 

 mm. Length of hind tibia, 1.51 mm.; length of huad tarsus, 0.27 mm.; hind 

 metatarsus, 0.09 mm.; length of beak, 1.74 mm. 



Alate viviparous female: General color: head nearly black, thorax dark 

 brown, abdomen light brown mottled with dark brown to black splotches, 

 body more or less pruinose. Antennae and legs hght at the base and dark 

 toward the ends. The former are somewhat stout and reach to the base of 

 the metathorax; the third segment bears 5 to 7 large sensoria (sometimes less) ; 

 the fourth, one or two; and the fifth, one large one at the distal end. The 

 wings are long and wide with the median vein three branched. The stigma is 

 long and narrow. Beak slender and sharp, reaching to within a short distance 

 of the base of the cauda. Nectaries broad, cone-shaped and of medium thick- 

 ness. Cauda broadly rounded. 



Measurements: Length of abdomen, 2.9 mm.; width, 1.45 mm. Length 

 of antennal segments: III, 0.4 mm.; IV, 0.176 mm.; V, 0.23 mm.; VI and spur, 

 0.154 mm. Length of wing, 3.8mm.; width, 1.3 mm.; length of hind tibia, 

 1.9 mm.; length of hind tarsus, 0.242 mm.; length of hind metatarsus, 0.09 

 mm.; length of beak, 1.9 mm. 



Lachnus parvus new species (Plate XI, figs, l.to 7.) 



Collected at Washington, D. C, July 4, September 15 and 

 October 21, 1909. This species is quite distinct from all others 

 collected l)y myself in the vicinity of Washington in that it is 



