222 GEO. H. HORN, M. D. 



That the species here described is that intended by Illiger can 

 hardly be doubted from the greater part of the description as well 

 as from the Melsheimer tradition, but in the Illiger description he 

 concludes : "plica submargmali," a character possessed by no species 

 in our fauna, except himarginata. Without attenij)ting to explain 

 the disagreement, the fact is noted to show that it has not been over- 

 looked. I have no doubt that the insect which has, for more than 

 fifty years, l)orne this name is the true species. 



Occurs from the Hudson's Bay region to New England States 

 south to Texas and Florida. 



5. H. vicaria n. sp. — Elongate ov^al, much narrowed in front, not very 

 convex, deep blue, moderately sliiuiiig. Antennse longer than half the body, 

 piceous, basal joints bluish, joints 2-3-4 gradually longer. Head coarsely punc- 

 tured near the eyes, fiontal carina prominent, tubercles rather feeble. Thorax 

 about one-third wider than long, scarcely narrowed in front, sides arcuate, mar- 

 gin narrow, slightly thickened at the front angles, disc convex, ante-basal im- 

 pression moderately deep, but not sharply impressed, usually gradually evanescent 

 at its ends, surface finely alutaceous. finely punctate, punctures a little coarser 

 near the sides and front angles. Elytra distinctly wider at base than the thorax, 

 humeri obtuse, umbone moderate, a slight impression within it, surface very 

 finely alutaceous, moderately closely punctate, but smoother near the apex. 

 Body beneath and legs colored as above ; abdomen indistinctly punctate. Length 

 .18 — .24 inch. ; 4.5 — 6 mm. 



The male has a sinuation each side of the middle of the last ven- 

 tral, the median lobe semi-circular, flattened, with a deep longitudinal 

 impression extending the entire length of the segment, finer in front. 



From the fact that the thorax has the base and apex nearly equal, 

 the species has the facies of having a relatively smaller thorax than 

 any other and the humeri are consequently more prominent. The 

 })unctuation is as close as in carinata, but less coarse. By the well 

 defined, but not entire ante-basal impressed line this species may be 

 distinguished from any of the large blue forms. 



Occurs from ^Massachusetts (Blauchard) to Florida, westward to 

 Colorado and Arizona. 



6. H . carinata Germ. — Oblong oval, subdepressed, bright coppery red with 

 bluish or purplish reflections, shining. Antenure half as long as the body, pice- 

 ous, the basal half somewhat anieous, joints 2-3-4 gradually longer. Head 

 nearly smooth, a transverse row of punctures between the eyes, carina feeble 

 tubercles small. Thorax about one third wider than long, scarcely narrowed in 

 front, sides sliglitly arcuate, margin narrow, thickened at the front angles, disc 

 convex, ante-basal impression moderately deep at middle, gradually evanescent 

 toward the sides, surface relatively coarsely, but not closely punctate. Elytra 

 a little wider at base than the thorax, humeri obtuse, feebly prominent, a slight 



