254 MEMOIRS ON THE COLEOPTERA 



4 



at the abdominal apex, there being but one puncture at each side 

 in both sexes, but the last segment is longer in the female than in 

 the male. The identification of our patruelis Dej., as inter stitialis, 

 is one of the most remarkable errors that can be recalled just now, 

 for, referring to Dej can's description of interstitialis, from Kamt- 

 schatka, it can be seen at once that it is a very much smaller species 

 than patruelis. The alternately more elevated and irregular strial 

 intervals, is a character traceable in most of the species of this 

 group to a greater or less degree. 



Group II 



The species of the californica type, constituting this group, are 

 more convex than in the preceding series and have the apex of the 

 prothorax less deeply sinuate; the legs, also, are never black; there 

 is sometimes a feeble trace, however, of the peculiar alternation of 

 convexity in the strial intervals characterizing the erratica group. 

 The prosternal characters of the male are amply distinctive. The 

 species known to me are the following: 



Prothorax widest at or very near the base 2 



Prothorax not widest at base 3 



2 Form stout, oblong-oval, notably convex, bronzed above, the sides of 

 the prothorax very slightly diaphanous; under surface black, non- 

 metallic, the legs piceous; elytra distinctly micro-reticulate in both 

 sexes but more shining in the male; head well developed, distinctly 

 more than half as wide as the prothorax; eyes moderately promin- 

 ent, the strioles somewhat deep and coarse; antennae rather short, 

 obscure rufous, the two basal joints paler rufous; prothorax a little 

 less than one-half wider than long; apex much narrower than the 

 base, feebly sinuate, the angles scarcely at all prominent, blunt; 

 sides converging and evenly, feebly arcuate from base to apex, 

 finely but abruptly, evenly reflexed; surface not at all depressed 

 postero-laterally, punctureless, with subobsolete transverse impres- 

 sions, the stria very fine, abbreviated; inner of the subbasal foveae 

 short but linear, deep and distinct, the outer similarly deep, linear 

 and posteriorly oblique outwardly as usual; elytra one-half (cf ) to 

 two-fifths ( 9 ) longer than wide, at the middle very distinctly wider 

 than the prothorax, obtuse behind; striae very fine, punctureless, 

 the scutellar long; lateral series moderately though completely inter- 

 rupted medially; intervals broad, perfectly flat (9), nearly so (cf). 

 Length (cf 9 ) 7.3-8.5 mm.; width 3.3-4.2 mm. California (Sonoma 

 to San Diego), also Lower California. Abundant., .californica Dej. 

 Form stout, oblong-suboval and convex, almost similar to californica in 

 coloration, lustre and general structure, but with the elytra relatively 

 somewhat shorter and with still finer s1 nation; head well developed, 



