116 AMERICAN COLEOPTERA. 



Group siii. bifasciabum. 



Head with the frontal grooves single, parallel ; eyes large, "prorai- 

 nent. Elytra with the humeri rounded, obsoletely striate, all the 

 striae abbreviated behind ; two dorsal punctures on the third interval. 



The above characters will suffice to separate the species of this 

 group from the others of the genus. Two species, both confined to 

 the Pacific coast region, are known to me. They resemble each 

 other very closely in color and markings, and also quadrimaculatam, 

 there being two pale yellow spots on each elytron, placed nearly as 

 in that species. They are easily distinguishable from it, however, 

 by the characters given in the definition of the groups, and may 

 thus be separated from each other : 



Prothorax snbquadrate, about one-half wider than long, scarcely narrower at 

 base than apex, basal impressions bistriate ; form depressed; legs piceous, 

 the tibiae and tarsi slightly paler. Length .13 .15 inch horiii n. sp. 



Prothorax subcordate, slightly wider than long, distinctly narrower at base than 

 apex, basal impressions unistriate ; form slightly convex; legs pale testa- 

 ceous. Length .13-. 17 inch . . -{mundum Lee.) bifasciatum Mots. 



102. B. horni n. sp. — ^Form broader and less elongate than in bifasciatum, 

 depressed ; color black, scarcely seneous. the elytra marked nearly as in that spe- 

 cies. Head as wide as the thorax at apex ; palpi piceous : antennae about one-half 

 the length of the body, piceous. the first joint rarely slightly paler. Prothorax 

 subquadrate, about one-half wider than long, scarcely narrower at base than 

 apex ; apex truncate ; median line fine, abbreviated before and behind : trans- 

 verse impressions moderately distinct; basal impressions broad, deep, bistriate; 

 sides with the margin very narrowly reflexed, arcuate in front, slightly sinuate 

 behind ; hind angles subrectangular, carinate. Elytra about one-half wider than 

 the thorax, oblong-ovate, striate as in hifascintnm ; intervals flat, the third with 

 the first dorsal puncture about one-third from base, the second about one-third 

 from apex. Beneath black, shining. Legs piceous, the tibiae and tarsi slightly 

 paler. Length .13-. 15 inch ; 3.25-3.75 mm. 



Closely allied to bifasciatum (mundum Lee), but broader, less 

 elongate and more depressed. It also differs by the form of the 

 thorax, which is broader and less narrowed behind, with the basal 

 impressions bistriate, and by the color of the antennse and legs. By 

 its markings it recalls both quadrimaculatum and wickhami. 



It is with great pleasure that I assign the name above proposed 

 to this species, not only as a slight token of gratitude for many per- 

 sonal favors, but also as an expression of the deep sense of obliga- 

 tion which I feel, in common with all coleopterists, for the great aid 

 afforded us in our favorite study by the fruitful, untiring labors of 

 Dr. George H. Horn. 



