ROLAND HAYWARD. 121 



strongly arcuate, sinuate in front of the hind angles, which are small and scarcely 

 evident, rectangular, not cariuate. Elytra distinctly wider than the thorax, ob- 

 long-ovate, finely striate; strise finely punctate; intervals fiat, the third with the 

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

 apex. Beneath black, shining. Legs testaceous. Length .11-. 15 inch ; 2.75- 

 3.75 mm. 



One of our best marked, as well as one of our most abundant, spe- 

 cies. In color it resembles bifasciatum, horni and wlckhami, but is 

 at once recognizable from all of them by the arrangement of the 

 frontal stride, the form of the thorax, and the striatiou of the elytra. 

 It is most nearly allied to pedlcellatum and midatam, but may be 

 distinguished by the characters above given. It is subject to but 

 slight variation. 



It occurs throughout the greater part of North America east of 

 the Rocky Mountains, in Europe and in Siberia. 



109. B. jucuiidiim Horn. — Form broad, moderately convex. Head and 

 thorax black, tinged with bluish green, shining; elytra piceous, with a broad, 

 nearly white vitta, with irregular sides, between the third and seventh strife, ex- 

 tending from the base nearly or quite to the apex. Head as wide as the thorax 

 at apex ; palpi testaceous ; antennae about one-half as long as the body, testaceous, 

 the outer joints slightly darker. Prothorax cordate, nearly twice as wide as long, 

 narrower at base than apex; apex truncate; median line very fine, abbreviated 

 in front; anterior transverse impression distinct, the posterior obsolete; basal 

 impressions very small, single; sides with the margin narrowly reflexed, moder- 

 ately strongly arcuate; hind angles small, scarcely evident, very obtuse, but not 

 rounded, not cariuate. Elytra distinctly wider than the thorax, oblong-ovate, 

 finely striate ; striae distinctly, but not very closely punctate; intervals nearly 

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

 about one-third from apex, the punctures placed near the third stria. Beneath 

 black, slightly feneons, shining. Legs testaceous. Length .14 inch ; 3.5 mm. 



An extremely pretty species, very distinct from any in our fauna. 

 In Dr. Horn's type the longitudinal vitta extends the entire length 

 of the elytra. In the only other specimen that I have seen, which 

 is from Arizona and also in Dr. Horn's cabinet, it does not quite 

 attain the apex, and the elytral strise are slightly more deeply im- 

 pressed. The tvvo agree in other respects. 



In this species the peduncle at the base of the thorax seems to 

 attain its greatest development. 



It occurs in Arizona and Lower California. 

 Group XV. aCQne. 



Maxill?e with the outer lobe biarticulate ; eyes large, prominent. 

 Frontal grooves slightly oblique, the outer interrupted. Thorax 

 cordate or subcordate, truncate at base. Elytra with the humeri 

 rounded ; two dorsal punctures on the third interval. 



TRANS. AM. ENT. SOC. XXIV. (16) MAY. 1897. 



