290 GEO. H. HORN, M. D. 



B. — Iiitercoxal process of abdomen narrow, acute, metasternuni usually 

 acutely notched posteriorly for its reception. 

 Elytra obliquely prolonged, not truncate. 



Middle tibisa male feebly dilated at tip intcgra. 



Middle tibise male rather strongly dilated aanbigua. 



Elytra truncate at tip. 

 Form oblong oval. 

 Middle tibise % strongly sinuate within, the inward prolongation of the 

 tip well marked. 



Thorax broadest at base, hind angles rectangular li^s'ichsonii. 



Thorax narrowed at base. 



The sides simply arcuate, hind angles not prominent rufldm. 



The sides sinuate posteriorly, hind angles rather acute. ..corticiua. 

 Middle tibiae % feebly sinuate, the tip merely thickened. 

 Thoracic margin explanate, usually sinuate near the base, hind angles 



subacute and prominent avara. 



Club of antennse dark iintnunda. 



Club of antennae pale acliiinbrata. 



Thorax slightly arcuate near the base, the hind angles obtuse, margin 



not explanate rulvesceuiil. 



Form elongate, para,llel. Middle tibiae % feebly sinuate. 

 Joints 3 — 4 — 5 of antennae moderately elongate. 



Surface subopaque, very indistinctly punctate. Thorax not sinuate 



posteriorly linearis. 



Surface moderately shining, distinctly punctate. Thorax sinuate pos- 

 teriorly truaicatella. 



Joint 3 only elongate, 4 — 8 short. 



Surface distinctly punctate. Sides of thorax slightly arcuate pos- 

 teriorly plauulata. 



E. monogama Crotch.— Oblong oval, piceous, moderately shining, sur- 

 face sparsely clothed with very short brownish pubescence. Head moderately 

 densely punctulate. Antennae rufous, joints 3 — 4—5 equal, 6 — 7 — 8 equal, each 

 half the length of the three preceding joints. Thorax twice as wide as long, 

 sides moderately arcuate, graduallj' narrowed from base to apex, margin rather 

 widely depressed, slightly reflexed, apical margin moderately emarginate, base 

 sinuate on each side, anterior angles obtuse, posterior angles rectangular, 

 .slightly obtuse, disc moderately densely punctulate. Elytra longer than wide 

 conjointly, slightly narrowed to apex which is truncate, margin reflexed, sur- 

 face punctured similarly to the thorax. Body beneath moderately densely 

 punctulate. Intereoxal process of abdomen broad, truncate. Length .20 inch ; 

 5 mm. 



Male. — An additional small dorsal abdominal segment. Middle tibije sinuate 

 within, dilated at tip and prolonged inwards. 



Female. — Abdomen without additional dorsal segment. Middle tibiae simplf, 

 gradually dilated from base to tip. 



This is the largest species in our fauna, and may be readily 

 distinguished by its piceous color and the characters given in tlie 

 table. 



Occurs in Vancouver and throughout the Sierra Nevada, in a 



