142 Annals Entomological Society of America [Vol. X, 



*Lachnus ponderosae Williams. 



Stem Mother. — Described from two specimens taken among many 

 second generation individuals on the bark of the smaller twigs of Pinus 

 ponder osa. Specimens taken by Miss Miriam A. Palmer in the foothills 

 west of Ft. Colhns. 



Ground color of adults golden brown, cornicles black with very 

 large mainmifonn bases of the same color; powdery above and below 

 the markings not well defined as the specimens have been rubbed 

 distal ends of femora and proximal and distal ends of tibiae black 

 hind tibiae with only a small portion near the proximal end pale; beak 

 attaining the tip of the abdomen; anal plates black; length of body 

 3; width 1 .90; hind tibiae 2. A rather robust species. No figures. 



Apterous Female, Second Generation. — Taken April 30, 1910, along 

 with the winged examples described below. 



Ground color dark, golden brown; cornicles, tips of antennae, distal 

 ends of femora and tibiae, tarsi, transverse patches on joints 1, 2, 7, 8 and 

 9 of the abdomen; joints 1, 2 and G and distal ends of joints 3, 4 and 5 

 of the antennae black; lateral margins of the thorax, an irregular median 

 patch on the first three joints of the abdomen and on either lateral 

 one-third of joint 4 of the abdomen powdery white; also small white 

 spots posterior to the cornicles on lateral margins of joints 6, 7 and 8. 

 Length, 2.75; width, 1.50 to 1.75; antenna, 1.17; hind tibice, 2; joints of 

 antenna in about the following ratios: 13 : 12 : 61 : 23 : 29 : 21 (with 

 spur). The sensoria are not always easily seen, but in .most examples 

 they can be determined as follows: III, 1 ; IV, 1 ; V, 2 ; VI, with teniiinal 

 or permanent sensoria only. It is not unusual to find two sensoria 

 on joints III and IV and occasionally 3 or 4 may be found on joint III. 

 See figures 32 to 35. 



Alate Viviparous Female. — General color of the al^domcn the same 

 golden brown as in the stem female; head, thorax, cornicles and anal plate 

 black; antennae blackish; the basal portions of joints 3, 4 and 5 of the 

 antennae pale; stigma long, narrow, parallel sided, black and extending 

 nearly one -half the distance from its distal extremity to base of wing; 

 tibiae with a pale ring near the proximal end; length of body 2.5(); 

 wing 4; hind tibiae, 2.25; joint 3 of antenna as long as 4 and 5 together; 

 5 distinctly longer than 4; 6 with spur, not quite as long as 4; joint 3 

 with 4 to {) large sensoria; joints 4 and 5 with two sensoria each. 



Described from many specimens taken at different dates upon the 

 twigs of yellow pine, P. ponderosa. 



Supplementary description from a dozen fresh specimens just 

 taken from pine twigs brought to the laboratory today, April 13, 1910. 



Middle legs entirely black, except for a narrow light ring near the 

 proximal ends of the tibiae; hind tibiae entirely black in some examples, 

 others show the pale annulus ; entire under surface powdered with white 

 secretion; diagonal white lines more or less distinct upon the meso- 

 thorax, and there are four prominent transverse white bands, widest at 

 the middle, upon the dorsum of the abdomen in front of the cornicles; 



*Aphididae of Nebraska, 1910, p. 22. 



