n8 MEMOIRS ON THE COLEOPTERA 



parts of Arizona. There are before me some fifteen species, of 

 which only three have been hitherto described. They may be 

 known as follows, presenting rather more structural diversity than 

 those of the calij "ornicus group: 



Larger species, generally not less than 15 mm. in length and confined 

 to the fauna of southern California and neighboring regions 2 



Smaller species, usually under 15 mm. in length, not occurring in the 

 regions cited 7 



2 Prothorax very distinctly shorter than wide 3 



Prothorax about as long as wide 4 



3- Elongate, rather convex, deep black, shining, the elytra moderately 

 and subequally alutaceous in both sexes; head three-fifths as wide 

 as the prothorax, the impressions deep, arcuate, widely separated 

 and diverging; mandibles entirely black; antennae pale brown, the 

 first three joints piceous; prothorax fully a fourth wider than long, 

 the sides rounded, rather rapidly converging behind about the 

 middle, becoming oblique and very broadly, feebly sinuate posteri- 

 orly, the angles very obtuse and somewhat rounded; base not quite 

 three-fourths the maximum width; surface strongly reflexed at the 

 sides, impressed toward the basal angles, the inner impression mode- 

 rately long, rather deep, the outer obsolete; anterior angles notably 

 rounded; elytra oval, two-thirds longer than wide, nearly a third 

 wider than the prothorax, with fine, slightly impressed, impunctate 

 striae and nearly flat intervals, becoming feebly convex laterad; 

 humeral denticle almost obsolete, the scutellar stria short but evi- 

 dent, oblique, not approaching the first stria; tarsi moderately long, 

 rather stout. Length (d 71 9 ) 15.0-17.0 mm.; width 5.7-6.2 mm. 

 California (Los Angeles). One example marked " Arizona," but 

 perhaps erroneously Isabellas Lee. 



Elongate but not so decidedly as in the preceding and more ventricose, the 

 type castaneous-brown throughout though exhibiting no other evi- 

 dences of immaturity, the lustre as in Isabella; head nearly similar but 

 with finer and more linear impressions, the mandibles black, rufous 

 basally; prothorax a fifth wider than long, similar in form, except 

 that the sides posteriorly are much more sinuate, becoming gradually 

 almost parallel at the basal angles, which are only a little more than 

 right though slightly blunt; side margins similarly strongly reflexed, 

 the apical angles however much more acute, only very narrowly 

 rounded; surface nearly similar, except that the outer of the basal 

 impressions is evident because of an elongate basal convexity near 

 the sides; base three-fourths the maximum width; elytra rather 

 broadly oval, very convex, three-fifths longer than wide, fully two- 

 fifths wider than the prothorax, otherwise similar, except that the 

 scutellar stria is longer, joining the first stria; female with four anal 

 setae, the inner pair double as is sometimes the case in isabellcE. 

 Length (9) 16.5 mm.; width 6.1 mm. California (San Diego). 



jacobinus n. sp. 



4 Sides of the prothorax oblique posteriorly, becoming only feebly 

 sinuate toward the angles, which are obtuse and blunt 5 



