NORTH AMERICAN COLEOPTERA. 297 



Male. — Last ventral slightly sinuate each side, a broad and deep triangular 

 impression at apex. Autenuse as in vitfata. 

 Female. — As in vittata. 



This is the largest and most robust of our species. It is more es- 

 pecially related to vittata, but has a much broader vitta, is larger and 

 of more robust form. The ventral characters of male also differ. 



Occurs in Oregon and Nevada. 



5. P. robusfa Lee. — Oblong oval, moderately convex, similar in form to 

 vittata, piceous, sui-face shining, slightly seneous, elytra with a broad yellow 

 vitta dilated at humerus and broadly dilated at tip, reaching the sides and apex. 

 AntenuiB as long as half the body, piceous, three basal joints pale. Head aluta- 

 ceous, indistinctly punctate. Thorax nearly twice as wide as long, slightly 

 narrowed in front, sides arcuate, disc convex, alutaceous, coarsely, deeply and 

 closely punctate. Elytra scarcely wider at base than the thorax, humeri ob- 

 liquely rounded, surface rather more coarsely punctured at base than the thorax, 

 gradually more finely to apex, the yellow vitta broad, parallel with the suture 

 the greater part of its length, incurved at the scutellura, a broad post-humeral 

 process, the apical third broadly expanded, reaching the apex and side margin. 

 Body beneath piceous abdomen sparsely punctate. Femora piceous, tibise and 

 tarsi paler. Length .03 inch. ; 2 mm. Plate VI, fig. 18. 



Male. — Last ventral slightly siimate each side, a very deeply impressed median 

 line extending two-thirds the length of the segment^ Antennse with joints 2-3-4 

 very nearly equal in length, the fourth slightly broader, fifth as long as the two 

 preceding, the apical free angle prolonged, sixth short, oval, 7-10 nearly equal, 

 gradually broader, eleventh longer. 



Female. — Has not been seen. 



While not different in form from vittata, and therefore scarcely 

 meriting its trivial name, the species is readily known by the very 

 broad yellow vitta, which at its apical third reaches side, apex and 

 suture. 



The sexual characters of the male are very well marked, and will 

 enable it to be at once distinguished. 



Occurs at Garland, Colorado ; collected by Mr. E. A.. Schwarz. 



6. P. <leii(icornis n. sp. — Elongate oval, rather feebly convex, entirely 

 piceous, shining, surface with slight seneous lustre. Antennse half as long as 

 the body, piceous, second and third joints paler. Head alutaceous, rather closely 

 punctate. Thorax nearly twice as wide as long, slightly narrowed in front, 

 sides feebly arcuate, disc convex, alutaceous, moderately, coarsely, closely punc- 

 tate. Elytra slightly wider at base than the thorax, humeri rounded, surface 

 shining, not alutaceous, the punctures less coarse than on the thorax, equally 

 dense, but less impressed, smoother near the apex. Body beneath piceous, ab- 

 domen sparsely punctate. Femora piceous, tibite and tarsi brownish. Length 

 .10 inch. ; 2..5 mm. 



Male. — Last ventral feebly sinuate each side, the middle with a deep, but short, 

 triangular impression. Antennae with joints 2-3-4 nearly equal in length, the 



TKANS. AM. ENT. SOC. XVI. (38) JULY, 1889. 



