1917 



Colorado Species of Lachnus 



143 



a spot between the cornicles, and a large transverse band back of the 

 cornicles; sensoria of third joint of antenna four to six in number, and 

 two each upon segments -1 and 5; beak extending nearly to the tip of 

 the abdomen or surpassing it; tibiae between l.SO and 2.10. See 

 figures 37 to 42. 



Alate Male. — Described from a single specimen in balsam. Length 

 of body, 1.40; antenna, 1; joints of antenna proportioned as follows: 

 III, 26; IV, 15; V, 16; VI (with spur), 13; sensoria rather strongly 

 tuberculate nearly circular and varying greatly in size occurring on all 

 sides of the segments, very numerous on joint III; joint IV with 10 to 

 12; V, with 5 to 6; VI with 1 besides the terminal group; eyes very 

 prominent; beak long, extending somewhat beyond the tip of the 

 abdomen; hind tibia, 1.25; wing, 3.3;. See figure 40, Plate II. 



Taken by Miss M. A. Palmer on Piniis scopiiloriim, Nov. 

 25, 1909, in the foothills, near Fort Collins. 



For the .original descriptions, see "The Aphididse of 

 Nebraska," Williams, in University Studies, Vol. X, No. 2, 

 1910. 



Lachnus pini (Linn), as described by Kaltenbach and Koch, 

 is very close to this species. 



We have taken examples of this species, all from Pinus 

 pofiderosa as follows: 



Young Stem Mothers Ft. Collins, Colo., Mar. 3 



Adult Stem Mothers. 



Apterous and-Alate 

 Viviparous Females. 



Oviparous Females and 

 Males 



Boulder, " 



Ft. Collins, " 



u a 



" ft. hills " 



Boulder, 



Ft. Collins, " 



• Walsenburg, " 

 Boulder, 



Colo. Spr., " 



Boulder, " 

 Ft. Collins, 

 Eldora, 



Boulder, " 



Ft. Collins, " 



Trinidad, " 



La Plata, " 

 Ft. Collins, 



Livermore, " 

 Ft. Collins, 



Ft. Collins, Colo. 



Mar. 19 



Aug. 7 



April 8 



April 11 



April 13 



April 23 



May 13 



May 31 



June 1 



June 1 



June 4 



June 1 1 



June 15 



June 18 



June 20 



Tune 24 



June 25 



June 25 



June 28 



June 28 



June 30 

 July 

 July 

 July 

 Aug, 



Nov 

 Nov. 25 



'10, C. N. Ainsley 



'10, M. A. Palmer 



'98 



'16 



'10 



'09 



'11 



'10 



'11 



'11 



'12 



'13 



'16 



'07 



'09 



'11 



'13 



'11 



'11 



'06 



'16 



'10 



'98 



'16 



'16 



'16 



'10 



'09 



