4l6 CALIFORNIA ACADEMY OF SCIENCES. 



Asida plaiiata belongs to a group of species which 

 seems fairly definable. The elytra at base are wider than 

 the thorax, the humeri rectangular or nearly so and the 

 lateral margin is distinctly reflexed. In repose the hind an- 

 gles of the thorax are slightly prolonged over the humeri. 

 It will be also observed that the mentum does not com- 

 pletely fill the gular emargination and the ligula is nearly 

 as distinctly visible as in Branchus. The species belong- 

 ing to this group are moderately numerous. In the fol- 

 lowing table will be found the species of our fauna to 

 which I have added two from Mexico, collar is and sciitel- 

 laris, as a means of adding a good number of other forms 

 from that reo'ion which belono- near those cited: 



Elytra sharply costate, the marginal ridge exteudiug to the apex; hiud 

 angles of the thorax not everted. 

 Elj'tral costa? regular, the outer one not joining the margin. (/rata. 

 Elytral cost» undulating, the outer joining the margin near the humer- 

 ous. scnleUaris. 



Elj^tra not sharply costate. 



Marginal ridge of elytra entire, exteudiug from base to apex; hind angles 

 of thorax everted. 

 Elytra with three lines of wrinkles replacing the costa?, disc traus- 



versely convex, more or less shining. mancipata. 



Elytra with slightly uneven and very opaque surface, transversely 



convex. opaca. 



Elytra with transversely flat and almost unsculptured surface. 



planata. 

 Marginal ridge of elytra short, humeral; elytra smooth; hind angles of 

 thorax not everted. 

 Thorax scarcely broader at base than apex and very little wider than 

 long. 

 Thorax coarsely punctured near the side. giiadricollis. 



Thorax at sides smooth. coUaris. 



Thorax broader than long, broader at base than apex. poUia. 



ASIDA SUBVITTATA n. Sp. 



Somewhat of the form and facies of opaca but with 

 the el3'tra more narrowed at base and expanded pos- 

 teriorly, dull black, elytra with three vittre of minute 



