H. C. FALL. 137 



Sylvania, California (Ricksecker). 



This species looks more like an Athous than a Corymbites, 

 and the incipient lobe of the third tarsal joint would bear out 

 the resemblance ; the frontal characters, however, are those 

 of Corymbites, and since the latter genus is already strongly 

 polymorphic, it seems better for the present to include the 

 species here. 



PLASTOCERUS Lee. 



Males of this genus are not uncommonly taken in Southern 

 California, either in flight at dusk or by beating or sweeping. 

 So far as I know no female specimens have ever been taken, 

 and their form is purely conjectural, though they might rea- 

 sonably be expected to resemble those of the allied genera 

 Aplastics and Euthysanius. The placing of P. {rater Lee, as 

 the female of Schaumii by Dr. Horn is an error for which 

 there seems little excuse. LeConte expressly states that 

 his unique type of f rater is a male, which declaration is 

 easily verifiable, the genitalia being plainly visible. Frater 

 is at once separable from our other Plastoceri by the rela- 

 tively short, almost non-ciliate antennal rami, these being 

 about half as long as the width of the front, while in all 

 others the rami are very nearly equal in length to the frontal 

 width. With frater removed there remains in my collection 

 a very perplexing array of specimens, in which several 

 species seem indicated, but in which, after the separation of 

 one well characterized form, I am unable to draw further 

 lines of distinction with any exactness. The form and punc- 

 tuation of the prothorax varies so much individually as to 

 be of no use in separation of species, and many other differ- 

 ences which are obvious when two individuals are compared 

 become evanescent or even reversed when more specimens 

 are examined. For the present, therefore, it is best to con- 

 sider all these varieties as forms of Schaumii. The typical 

 Schaumii comes from San Diego in the immediate vicinity 

 of the coast. It is dark piceous brown in color, the eyes 

 relatively small and less prominent than in other forms, 

 their width as seen from the front less than one-fourth the 

 frontal width ; the elytra about three times as long as wide. 



TRANS. AM. ENT. SOC.XXXVI. (18) JUNE, 1910. 



