210 Trans. Acad. Sci. of St. Louis. 
base; antennae very much shorter than the head and prothorax, slender 
and not distinctly incrassate distally; prothorax nearly as in saginellus 
but only very slightly narrower than the head, the anterior angles at 
apical fifth; elytra smaller, barely as long as wide, slightly narrower 
than the head, equal in width to the prothorax and barely three-fourths 
as long, the sides just visibly diverging from the base. Length 2.5 mm.; 
width 0.45 mm. Texas (HoustOn) .... coo sscevece quadripennis n. sp. 
A number of female types are included in the above table, 
but, as the parallel-sided notch of the sixth male ventral is a 
very exceptional character, all but ¢exanus and gilensis are 
assumed to have the broad notch in the form of an acute in- 
cised cusp with broadly diverging and arcuate sides. In all 
the males having the latter type of emargination, which I 
have been able to examine, the form is very constant, varying 
only in degree, so that it is seldom mentioned in the descrip- 
tions, even when the male is at hand, and I have assumed that 
the triangular emargination of californicus, mentioned by 
Fall, is really of the same character, though in this case the 
notch appears to be somewhat deeper than usual. -Arizonae 
seems to differ from californicus Fall, in its larger size 
and relatively less slender and parallel outline. Notangulus 
is closely allied to extguus but is distinguished by the notably 
more elongate elytra, when compared with the prothorax. 
Degener is represented by a single specimen of a very unusual 
pale and uniform coloration, but exhibiting scarcely any 
other evidence of immaturity; it is distinguishable from 
exiguus, however, by its narrower and relatively more elongate 
prothorax. The last three species of the table are of re- 
markably aberrant form, owing to their very short elytra, 
but the male sexual characters are of the usual type. 
Saginellus and quadripennis are each represented by a single 
male, the species differing principally in the antennae, rela- 
tive size of the elytra and prothorax, and, somewhat, in the 
eyes and relative form and degree of separation of the gular 
sutures. Both longipennis and californicus are unknown to 
me, and the above outlines are derived from the original 
diagnosis as published by Mr. Fall (Occas. Papers, Cal. 
Acad. Sci., viii). 
