Heteroecus pacificus

Naked, elongate, spindle-shaped. Cylindrical, with a constricted base and a greatly elongate, slender tip; entirely straight or curved; entirely naked, smooth, bright green splotched with brown to purple-brown, becoming dark brown upon aging. Solid, except for the cylindrical cavity extending from the base two-thirds to the tip, the larval cell not always at the very end of the cavity. On twigs of Quercus chrysolepis.

RANGE. — California: San Jacinto Mountains to Dunsmuir and Ukiah; probably wherever Q. chrysolepis occurs.

This species morphologically is closely related to dasydactyli, but altho Ashmead stated that the insects of pacificus ''cannot be separated from A. dasydactyli", his types of the two are distinct, showing differences which agree with those in the material I have bred from the two types of galls. Pacificus never bears any of the woolly covering which is characteristic of dasydactyli. Adult insects emerge in the spring, a couple of months earlier in southern than in northern California.

[Kinsey describes three varieties of this species; see paper for details]

- Alfred Charles Kinsey: (1922) Studies of some new and described Cynipidae (Hymenoptera)^©

Reference: https://www.biodiversitylibrary.org/page/45387583#page/156/mode/1up