NORTH AMERICAN COLEOPTERA. 47 



- This insect resembles, at iii'st glance, some of our smaller Melanoti, 

 and is easily known among all our Eucnemidae hy its antennal struc- 

 ture and the frontal crest. 



Occurs from Alaska to the mountain regions of Pennsylvania, also 



in New Mexico. 



PHL.EGON Laporte. 



Form oblong, elongate ; autennse a little shorter than half the body, first joint 

 moderately thick, second small, third shorter than half the tirst and nearly as 

 long as the next two, fonr to eight small, but at least a little longer than wide, 

 last three joints abruptly much longer and broader, the last joint longest; eyes 

 round, moderately pi-omineut ; clyi)eus inflexed, rather broad at base, apical mar- 

 gin entire, arcuate ; prothorax wider than long, lateral marginal line nearly en- 

 tire, beneath without antennal grooves ; scutellum longer than wide, truncate at 

 tij) ; elytra striate ; prosternum arcuate at tip, acute ; metathoracic episterna 

 moderately wide, jjarallel, the epimera not visible ; posterior coxal plates very 

 broad internally; tarsi slender, the first joint of the middle and posterior pairs 

 as long as the next three, the joints not lobed beneath ; claws slender, simple. 



In Bonvouloir's descri])tion the fourth joint is said to be " exca- 

 vate-emarginate," which is not true of our species. Phlegon may be 

 readily known by the suddenly elongate last three joints of the an- 

 tennae. 



Two species are known to me. 



Thorax arcuately narrowed from base to apex ; hind coxal plates at the widest 

 portion at least one-half as wide as the length from the side to the middle. 



heterocerus. 



Thorax parallel behind, sides arcuate in front ; hind coxal plates less than half 

 the width of the coxa ITlkoi. 



P. heterocerus Say. — Form oblong-elongate, a little more obtuse in front, 

 gradually narrower posteriorly, ferruginous brown, feebly shining, sparsely 

 clothed with fulvous pubescence ; autennte nearly reaching the middle of the 

 body % , shorter 9 • tiead coarsely and densely punctured, front broadly im- 

 pressed, a feeble impressed line on the vertex ; thorax one-third wider than long, 

 arcuately narrower from base to apex, hind angles not carinate ; disc convex, a 

 vague median impressed line posteriorly, surface with moderate punctuation, 

 rather closely placed ; elytra narrower posteriorly, surface distinctly, but finely 

 striate, the intervals slightly convex, densely punctate, the punctures finer than 

 on the thorax but rougher ; body beneath more shining than above, punctuation, 

 dense and rather fine. Length .40 - .44 inch ; 10-11 mm. 



Male. — First joint of antenuse as long as the next three, second small, partly 

 concealed behind the first, half as long as the third, third as long as the next 

 two, which are nearly equal, six, seven and eight equal, quadrate, nine and ten 

 equal, together as long as the preceding six, eleventh joint long, equal to the 

 preceding two, obliquely impressed at its anterior two-thirds. 



Female. — Joints one to eight as in the male, joints nine to eleven together a 

 little longer than three to eight together, joints nine and ten broader and equal 

 the tenth more slender and a little longer. 



