280 H. C. FALL. 



one species only — fHScula—is characteristic of the Carolinian re- 

 gion, though several others — subvittata, testacea and truncata (Ne- 

 braska), and eloiigata (Kansas and Texas?) — have been occasion- 

 ally found witiiin its boundaries. In Southern California, tnw^cula 

 and truncata range from elevations of one thousand to six thousand 

 feet or more, thus inhabiting indifferently both the Sonoran and 

 Trantion Zones ; while ;:)it.n7/a and nana (Southern California s and 

 picea (Lower California) should probably be regarded as true n)em 

 bers of the Sonoran fauna. 



The following table is devised for the separation of the species 

 now known to me. The order here is merely one of convenience, 

 and not that which should be followed in a cabinet arrangement. 

 The sequence of species in the notes following the table is the best.I 

 can now suggest, but, as is often the case in a linear arrangement, it 

 is in some respects unsatisfactory. 



Prothorax without a well-defined median longitudinal sulcus; the disk evenly 



convex, or at most with a faintly impressed median line 1. 



Prothorax rather deeply longitudinally sulcate 7. 



1. Antennae 8-jointed ; color brownish to testaceous, without metallic lustre 



(Lower California) picea . 



Antennae 9-jointed. 



Clypeal angles right, or even slightly acute truucata. 



Clypeal angles more or less rounded 2. 



2. Antennal club short and equal in the sexes; clypeus strongly prolonged in 



front of the labrum ; color black clypeata. 



Antennal club much longer in the male (male of pallens not seen); clypeus 



less advanced. 



Antennal club in the male as long as the. entire stem longielava. 



Antennal club in the male subequal in length to the funicle 3. 



3. Terminal joint of maxillary palpi narrowed apically, the tip feebly truncate; 



sides of thorax as viewed from above arcuate ; form very robust. 



robusta. 



Terminal joint of maxillary palpi widened apically, and more or less broadly 



obliquely truncate ; sides of thorax distinctly subangulate 4. 



4. Prevailing color testaceous, the elytra often with faint greenish or aeneous 



surface lustre. 

 Head, including the eyes, distinctly more than half as wide as the thorax in 

 both sexes. 

 Clypeus densely punctate and more opaque, more narrowly reflexed, the 

 suture unimpressed : elytra with lateral darker vitta, which is more 



pronounced at its extremities subvittata. 



Clypeus less densely punctate, shining, less narrowly reflexed, the suture 

 deeply impressed ; elytra faintly aeneous, without lateral vitta. 



diliita. 

 Head narrower, not or scarcely exceeding half the thoracic width in the 

 female. 



