47 
simple, though often definitely toothed. Most of the specimens 
seen came from an altitude of from three thousand to over 
four thousand feet, as from Kokee and Puu Ka Pele, on the 
island of Kauai, and were collected during May or June. [| 
believe that from this group will develop the dominant and 
perhaps stable type of the future if the species persists. At 
present, however, there is great instability. Among the de- 
scribed forms I would assign to this group besides Aptero- 
cyclus honoluluensis Water., previously mentioned, 4. munroi 
Sharp, 4. adpropinquans Sharp, A. varians Sharp, and 4. 
deceptor’ Sharp, so-called species which are but slightly dif- 
ferent, each in its own way, from the bulk of this group. If 
I were to name other new forms, basing them upon the same 
degrees of modification, noted for the above, I would need to 
designate at least fifty new forms, for, as I have previously 
stated, hardly any two specimens have the same structures 
modified in the same way and to the same degree. 
The third group will include a number of individuals which 
are primarily characterized by being quite large, robust, and 
decidedly opaque. They have much elongated and untoothed 
mandibles, fig. 5, a triangular clypeus, and fore tibiae very 
robust and markedly tripalmate at the apex, fig. 11. In one 
specimen, the submentum is arcuate anteriorly, in the others, 
trapezoidal. In all other regards, they resemble the members 
of group two and show the same degree of variability as 
regards character. Five specimens of this phase are now be- 
fore me, one belonging to the Bishop Museum, one to Mr. 
Giffard, and three to me, all collected by Mr. Kusche at an 
altitude of four thousand feet on the island of Kauai. This 
very distinct phase, I consider worthy of a name so will call 
it the variety palmatus n. var. and designate one of my speci- 
mens as the type, the other specimens as paratypes. It is a 

EXPLANATION OF PLATE II. 
Fig. 13, Male genitalia of Apterocyclus honoluluensis Water., upper side. 
Fig. 14, Male genitalia of Apterocyelus honoluluensis Water., under side. 
Figs. 13 and 14 are copied from drawings made by Mr. W. M. Giffard, 
and the parts are named according to the nomenclature of Sharp and 
Muir. 
