Biorhiza tanos, n. sp.
Agamic form

Gall. — Similar to that of B. pulchripennis. Light to medium brown in color (no darker); of medium size, up to 4.0 mm, averaging nearer 3.2 mm. in diameter.

Host. — Quercus repanda, the lowest dwarf oak of the area. Replaced on all the taller tree species in the region by B. stelis and B. tricosa.

Range. — Hidalgo: Pachuca, 7 N, 8700' (types). Mexico: Mexico City, 32 E, 10,6007 Mexico Citv, 20 S. 9400'

Apparently one species on the dwarf oaks throughout the mountains rimming the Valley of Mexico.

Life History. — Adults: March 6, 18, 24, 25, 23 Nearly all of the recorded emergence in the last week of March.

In the mountains rimming the Valley of Mexico, on the taller tree species of oak there are two species of the present complex: stelis at the northern end, and tricosa at the southern end of the Valley. Throughout the entire area there is one species, tanos, on the low dwarf oaks of the Q, repanda complex.

- Alfred Kinsey: (1937) New Mexican gall wasps (Hymenoptera, Cynipidae). II^©