NORTH AMERICAN COLEOPTERA. 191 



punctate, a moderate interocular ciepression. Thorax not twice as wide as long, 

 arcuately narrower to apex, margin moderately explanate, the front angle denti- 

 form, surface distinctly alutaceous, sparsely, finely punctate. Elytra oval, 

 slightly oblong, humeri obtuse, margin not explanate. umbone not prominent, 

 disc moderately coarsely and closely, not deeply, punctate, surface alutaceous, 

 entirely blue or bluish green. Epipleurse piceous, narrow at apical half. Abdo- 

 men shining, sparsely punctate. Length .12 — .16 inch. ; 3 — 4 mm. 



Similar in form to thyamoides, but differs in color. The siiiuation 

 of the outer edge of the posterior tibiae is quite feeble and must be 

 looked for with some care.- 



Occurs in Georgia and Florida. 



20. <E. lexaiia Crotch. — Elongate oval, subdepressed, moderately shining, 

 beneath reddish yellow, above pale yellow, each elytron with the sutural and 

 median vitta. Antennte slender, longer than half the body, outer half piceous, 

 basal five joints paler, third and fourth joints equal. Head reddish yellow 

 punctate, a deep impression from eye to eye, frontal carina obtuse, tubercles in- 

 distinct. Thorax not quite twice as wide as long, very little wider at base than 

 apex, sides arcuate, margin moderately explanate, anterior angles slightly denti- 

 form, surface finely alutaceous, sparsely punctate; scutellum black. Elytra not 

 wider at base than the thorax, oblong oval, humeri obliterated, umbone not dis- 

 tinct, margin not explnnate, moderately coarsely, not densely punctate, smooth 

 near apex, color pale yellow, normally with the sutural vitta entire, a median 

 vitta exactly parallel not reaching the apex. Epipleurse pale. Body beneath 

 and posterior legs reddish yellow, front and middle legs paler. Abdomen shin- 

 ing, very coarsely punctured. Length .16 — .IS inch.; 4 — 4.5 mm. Plate V, figs. 

 9—12. 



This species is very like a Systena in form and coloration, being 

 but little broader. 



The markings vary notably. The vitta normally are as described, 

 extending from the basal edge. S])ecimens occur in which the me- 

 dian vittae do not reach the base ; others again have the vittte con- 

 fluent in a discal space, in which, however, the edges are irregular. 

 Still more rarely the sutural vitta alone remains. The head may be 

 fuscous. 



The only species with which some varieties of this might be con- 

 founded is iliyamoide^, which is broader, the sides of elytra distinctly 

 explanate, and the discal spot regularly oval, not reaching the apex. 



Occurs in Texas (Dallas). 



21. <K. thyaiiioitles Crotch.— Oval, subdepressed, moderately shining, 

 reddish yellow beneath, pale yellow above, elytra with a broadly oval, common, 

 black spot. Antennae slender, longer than half the body, piceous, three or four 

 basal joints paler, third and fourth equal. Head pale, occiput slightly darker, 

 finely alutaceous, sparsely punctate, a deep, transverse, interocular impression, 

 frontal carina obtuse, the tubercles indistinct. Thorax more than twice as wide 



