48 ' J. L. LECONTE, M. D. 



Black, anterior half of head, and prothorax red; prothorax not wider than 

 long, narrowed behind, sides sinuate. Length 6 — 8 mm.; Can.; L. Sup.; 



Penn 19. puiictalus Lee. 



fi. — Black, prothorax square, front angles rounded; very slightly punctulate, shin- 

 ing, dorsal line deep, sides more or less yellow; sides of muzzle testaceous; 

 9 antennae shorter, abdomen when distended longer than elytra. Length 



8—10 mm.; Utah; Mont.; Col.; B. Col 20. brevipeiillBS Lee. 



Pieeous, base of antennte, sides of mouth, sides of prothorax, and margins of 



elytra testaceous ; head sparsely punctured behind, prothorax deeply concave 



at the middle, dorsal line fine, surfiice shining, sparsel}^ punctulate. Length 



8 mm.; L. Sup.; Mt. Wash., N. H., (Austin)....21. piincticollis Kirby. 



7. — Head and prothorax finely punctured or punctulate ; the latter with a wide 



medial concavity and two elongate convexities 8. 



Head nearly smooth; prothorax quite smooth 13. 



8. — -Prothorax shining, sparsely punctured, head finely punctured 9. 



Prothorax opake, punctulate, head punctulate 10. 



9. — Black, prothorax not longer than wide, yellow, sides rounded near the apex; 

 second joint of antennfe shorter than the third. Length 8 mm. ; Cal., Lake 



Tahoe ' 22. xaiithodertis n. sp. 



a. — Prothorax with a broad black dorsal stripe; (perhaps distinct) ; B. Col. 

 Yellow, under surface and antennse pieeous, the latter yellow at base ; pro- 

 thorax much narrower than the head, longer than wide, sides parallel, 

 slightly rounded in front, lateral basal impressions deeper and more defined ; 

 second joint of antennte as long as the third. This species has a very de- 

 ceptive resemblance to cavicollit, but is easily recognized by the different 

 form of the tarsal claws. Length 6 — 9 mm.; Vane; Cal.; Nev. 



23. llltosilS n. sp. 



10. — Prothorax longer than wide ,11. 



Prothorax not longer than wide 12. 



II. — Prothorax with the sides fulvous, front angles very slightly obliquely trun- 

 cate ; head finely and densely punctured. Length 8 mm. ; Cal. : San Mateo ; 



one specimen 24. macer Lee. 



Prothorax entirely black, front angles strongly obliquely truncate, base of 

 antennfe dull testaceous; head not densely punctulate. Length 6 — 8 mm. ; 



Can.; Mont.; Or.; Alaska, Vane 25. piiiiphilus Mann. 



Head sparsely punctulate ; Sitka, one specimen ; (perhaps a distinct species). 

 12. — Anterior half of head and sides of prothorax yellow; head densely punctu- 

 late, tarsi moderately broad, especially the front pair. Length 7 mm.; 



Col.; N. Mex : 26. ]at<>ralis Lee 



o. — Prothorax entirely yellow. 

 Mouth pieeous, three joints of antennfe and palpi testaceous, legs tinged with 

 testaceous, head less distinctly punctured; Length fi mm.; L. Sup. 



27. piiborHliis Lee. 

 a. — Prothorax bright red; Canada. 

 Anterior half of head dull testaceous; base of antennfe and logs tinged with 

 testaceous; prothorax with front angles strongly obliquely truncate, disc 

 finely punctuhite, less concave at the middle than in the preceding species; 

 elytra more distinctly rugose-punctulate (as in lateralis), with indistinct 

 elevated lines; side margin pale. Length 7 mm.; H. B. Terr.; one speci- 

 men 28. extremiis n. sp. 



