Asiphum rosettei n. sp.

Described from holotype and 9 paratypes taken on Populus tremuloides, 7,000 feet elevation in canyon of South St. Vrain Creek, Boulder Co., Colo., July, 1915.

The fundatrix appears to feed on the petioles of the newly opening leaves, causing them to become curved more or less backward. This forms a rosette of leaves by stunting the growth of the internodes of the young branch.

The fundatrigenia feed on the unexposed surfaces of the leaves forming the rosette. After the migration the young wood elongates somewhat so that the rosette gradually disappears except for a slight deformity of the branch and leaves.

Taxonomy: This species is very near Asiphum tremulae De Geer as described by Tullgren, but differs from it in having wax pores on lobes of metathorax and fewer secondary sensoria on III and IV of the antennae of the fundatrigenia.

- Asa Maxson: (1934) Four new pemphigids from Colorado (Aphidae: Homoptera)^©