28 Journal New York Entomological Society. ivoi vii. 



versuta, both of which were placed in the Truncatje by Horn, are 

 nearly as aberrant in prosternal structure. These four species, with 

 opinabills, in which tlie prosternal margin is obviously sinuate and a 

 little retracted are the only ones that need mention as being conspic- 

 uously irregular in this respect. The subapical ventral plate or crest 

 is moderately thin and regular in alicia, piilchclla, obtiisa and texana, 

 (doubtful in censors'), and thick or lacking in the remaining species. 

 I have used iiihulus Fab., in place of ciilta Web., in deference to the 

 authors of the Catalogus and Biologia who may be presumed to have a 

 reason for giving priority to the former, though the works of both 

 Fabricius and Weber bear the date 1801. The following table will 

 probably suffice for the identification of most specimens : 



Antenns; with the fifth joint suddenly broader than the fourth, which is cylindrical.. I 



Antennix" gracually broader from the third joint, the fourth joint similar in form to the 



fifth 9 



1. Last ventral without subapical crest 7 



Last ventral with more or less distinct subapical crest (feeble or absent mopiii- 



abilii ) 2 



2. Thorax without yellow marginal spot ( except o/>inal>ilis) 3 



Thorax with yellow spot at sides. i 



Sides of thorax narrowing from base to apex. 



Forni narrower, hairs of upper surface nearly white alicia. • 



Form stouter,- hairs of upper surface brownish pulchella. 



Sides of thorax more strongly rounded, widest a little behind the middle. -<(2uf ' ^L 



obtusa. ^'^ 



3. Thorax wider than the elytra, discal imjjressions as in preceding groups. 



consors. , 



Thorax not wider than the elytra, discal impressions feeble 4 ] 



4. Subapical crest of last ventral with thin edge, which is broadly evenly rounded. ! 



texana. 



Subapical crest of last ventral thick, more or less irregular 5 



Color blue, or blue green, elytra with red marginal spots 6 



5. Color piceous, more or less bronzed, elytra with yellow markings. 



Hind tarsi a little shorter than half the tibin?, hairs of upper surface short, seti- 

 form. 

 Front margin of prosternum straight, thorax without yellow marginal spot. 



subbalteata. 



Front margin of prosternum distinctly sinuate, thorax with yellow spot at 



sides opinabilis. 



Hind tarsi distinctly longer than half the tibia% hairs of upper surface fine and 

 rather long versuta. 



6. Prosternum with a stout tooth each side the middle sinus Stigmata. ^ 



Prosternum with a short broad lobe at middle which is broadly emarginate with 



rounded angles bivulnera. 



