210 Trans. Acad. Sci. of St. Louis. 



base; antennae very much shorter than the head and prothoras, 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) qnadripennis 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 

 ■v^ery exceptional character, all but texanus 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, JVotangidus 

 is closely allied to exiguus 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). 



