cf. Not to be distinguished from D.tricorne, etc. - my difficulties to draw the lines between it + forms of D.agassizii (incl. D.einfieldi) on the one side + D.decicornis + D.petrina on the other, which are probably no more than varieties. Harting's own specimen in Herb, Gray of D.petrina shows the claw of lower fulval spurs instead of "scalecords" The lower fulvra are sometimes scarcely distinct VII - The western Diphylloides (D.lamellibranchus) is my perplexity + it is difficult to define the limits of any one of them. The widely distributed D.menjiana, while it closely approaches D.tricorne of the East, grades into D.petrina, Butte of Calif. resembles the smaller forms of D.simplyx, of Calif.