Disholcaspis (mexicana) largior, new species
Agamic form

GALL.—Rosy to brownish tan, probably light and brighter when fresh, weathering darker brown ; inner faces of galls which are pressed against other galls in the clusters are smooth and shiny, but exposed surfaces are very much wrinkled, and conspicuously reticulate ; individual galls (in the rare instances where they occur singly) are more or less globose, but galls in compact clusters are very much compressed, making each one thin and flat with the exposed tops triangulate in outline ; a whole cluster therefore with a surface much like that of an unopened pine cone ; individual galls up to 24. mm. in diameter and 19. mm. in height; whole clusters up to 83. mm. in length and 44. mm. in diameter (Figure 4).

HOST. — Quercus rhodonplebia [rugosa], a large-leaved, evergreen white oak. Replaced on Q. chihuahuensis in the same area by Disholcaspis (mexicana) mexicana.

RANGE.—Pabellon, 20 W, 7000' (types). Probably restricted to> a portion of the Western Sierra of Mexico, including the mountains of the state of Aguascalientes.

LIFE HISTORY.—Adults: mature at some unrecorded date after November 26 (probably within the next few weeks).

We found this insect occuring in the same locality with Disholcaspis (mexicana) mexicana (Beutenmiiller), west of Pabellon, in the state of Aguascalientes; but largior was found on Q. rhodophlebia, while mexicana was found, in this region, on Q. chihuahuensis. The galls of the two are even more different, for the individual galls of mexicana, even in compact clusters, are more globose and smooth and shining; while those of largior are conspicuously wrinkled and so distorted that they show triangulate ends in their cone-like clusters.