Hebard—Dermaptera and Orthoptera of Hawaii B71 
second group has the limbs relatively elongate and immaculate. 
To it belongs nigrolineatus Perkins, but the validity of the other 
species, referable to this type, is as uncertain as in the first 
group. The third is represented by a single comparatively stout 
species, with limbs relatively short and showing very weak traces 
of annuli. 
As some smaller immaculate individuals have shorter limbs, 
these groups are by no means sharply distinguished one from 
the other, and recession of coloration in the annulate type may 
cause such annuli almost to disappear, as might be expected. Pro- 
ceeding further we find that individuals of the first two types 
have tegmina varying from minute, lateral, and scarcely project- 
ing lobes, to small, but overlapping, lobes, which wholly cover 
the metanotum. ‘Though each series shows a large proportion of 
the specimens runing constant to one or the other of these ex- 
tremes, yet certain individuals are intermediate. 
The metanotum of adult males, in which this area is ex- 
posed, shows a slight, twin convexity, each side with a median 
impression. In males with the metanotum nearly or wholly 
covered by the tegmina, however, we find much higher specializa- 
tion, as shown on Plate xxv, 11. This might be considered 
most important in determining the number of species repre- 
sented, were it not for the fact that we know tegminal size to be 
often (though not always) attributable to individual variation 
within a species, whereas the disappearance of glandular special- 
ization may result solely from tegminal reduction, leaving the 
otherwise specialized area unprotected. 
In length of ovipositor many of the Gryllidae show very great 
individual variation and in the present genus the extremes to 
be found in each species are probably decided. 
In the immature stages minute, lateral tegminal lobes are pres- 
ent, even at a time when no more than half the adult size has been 
attained. This fact adds the further difficulty that some of the 
males, possessing them, though apparently adult, may not be mature 
and might have had the larger overlapping lobes when adult. 
We, therefore, record the material before us as representing 
[ 69 | 
