SOME PEMPHIGINAE ATTACKING SPECIES OF 
POPULUS IN COLORADO. 
(Concluded from Vol VI, p. 493.) 
By C. P. GILLETTE. 
Thecabius populiconduplifolius Cowen, Plate XV, Figures 1 to 9. 
Pemphigus populiconduplifolius, Cowen, Hemiptera of Colorado, Bull. 31, 
Colo. Exp. Sta., p. 115, 1895. Hunter, Aphidide of North America, p. 79, 1901. 
Gillette,* Jour. Economic Ent. p. 355, 1909. Jackson, Cols. Hort. Soc. Vol. 22, 
p. 217, 1908. Contributions No. 29, Dep. Zool. and Ent., O. S. U., p. 217, 1908. 
Pemphigus ranunculi n. sp., Davidson, Jour. Economic Ent. p. 372, 1910. 
Pemphigus populiconduplifolius, Davidson, Jour. Economic Ent. p. 374, 1910. 
Pemphigus californicus, Davidson, Jour. of Economic Ent. p. 414, 1911. 
Pemphigus populiconduplifolius, Essig, Pom. Jour. Ent. p. 699, 1912. 
Pemphigus californicus, Essig, Pom. Jour. Ent. pp. 699, and 700, 1912. Essig, 
Pom. Jour. Ent. p. 827, 1912. 
Pemphigus populiconduplifolius, Patch,* Bull. 218, Maine Exp. Sta. p. 76, 1913. 
The above literature may be briefly summarized as follows: 
The original description by Mr. Cowen dealt with the alate 
fundatrigenia in the folded leaves of the cottonwoods with the 
mere mention of yellow apterous individuals, all from Colorado. 
Hunter lists this species only. 
The writer, in 1909, recorded the species from Massa- 
chusetts. 
Davidson, 1910, described the alate and apterous forms 
taken in California from the buttercup (Ranunculus Caltfor- 
nicus) to which he gave the name ranuncul1, but which is prob- 
ably populiconduplifolius, as Mr. Bragg and Mr. Asa C. Maxson 
have repeatedly traced this species to the buttercup in Colo- 
rado, where it seems to be perfectly at home. On page 374 of 
the same paper Davidson records populiconduplifolius in the 
folded leaves of Populus trichocarpa and mentions seeing the 
stem mother. 
*These can hardly be populiconduplifolius, as the stem females were reported 
in both cases as being present in the colonies of developing lice, a condition which 
we have never found in Colorado where the types of the species were taken. Fur- 
thermore, I have a stem female from Massachusetts that was taken by Mr. L. C. 
Bragg, and it is readily distinguishable from any of the stem females that I have 
seen from Colorado by having remarkably thickened femora for all legs. The 
femora are very nearly twice as great in diameter as they are in the Colorado form 
and are of about the same length. Four winged migrants taken from Populus 
balsamifera (Acc. No. 47-10) in Maine by Dr. Edith M. Patch are before me, 
mounted in balsam. These seem to differ from Colorado examples principally 
by having weaker sensoria, which are also fewer in number, on the sixth joint of 
the antennz. I will suggest that this eastern form be known as Thecabius patchit, 
though it does not have the typical habit of most known examples of this genus of 
having the stem mother in a gall by herself. 
6. 
