804 Trans, Acad. ScL of St. Louis. 



than toward base, the surface with a few sparse punctures; elytra two- 

 flfths wider and longer than the prothorax, with a few sparse punc- 

 tures, especially evident toward base, the humeri distinctly exposed ; 

 abdomen slightly narrower than the elytra, parallel and straight at the 

 Bides, moderately narrowed posteriorly only near the apex; female 

 with the sixth tergite broadly rounded. Male characters obscured in 

 the type but apparently feeble. Length 1.26-1.85 mm. ; width 0.42-0.51 

 mm. Ontario (Toronto) exilig n. sp. 



The above is only the first rude attempt to bring order out 

 of chaos and may not represent the most natural succession 

 of the species in this hitherto neglected genus. There are, 

 for example, several transitions between the species having 

 the antennae decidedly increasing in thickness from the fifth 

 joint to the tip and those having joints five to eleven parallel, 

 and I do not believe that this is an altogether natural sub- 

 division. These transitional forms are mentioned, however, 

 in the above descriptions and will probably not give rise to 

 much uncertainty in identification. The principal object at 

 the present time is to bring forward such characters as may 

 be easily recognized, in order that the species may be identi- 

 fied and further study and collecting encouraged. The next 

 revision, with fuller material, may enable the reviewer to give 

 a more natural classification, perhaps based primarily upon 

 the very pronounced secondary sexual modifications of the 

 male. 



The species identified above as Jiavicornis Mels., varies in 

 <5olor more than any other that I have observed, the usual 

 coloration being dark but varying from this to almost wholly 

 flavate. Inconspicua has very nearly the same secondary 

 sexual characters as lacustriSy except that the tubercle of the 

 fifth tergite is rather smaller and more circular and it is 

 therefore very closely related, although lacking the peculiarly 

 pitted elytra characterizing the three species of that imme- 

 diate group. For the present, therefore, I have regarded it 

 as a subspecies of lacustris. In the Henshaw list a species 

 *♦ affinis Fauv.," is inscribed; affinis Sahib., is undoubtedly 

 intended, but there is no American species before me corre- 

 sponding in sexual characters to the examples of that species 

 forwarded by Mr. Reitter and taken in the Caucasus. I have 



