NORTH AMERICAN COLKOPTERA. 39 



HYLOCHARES Lati. 



Form cylindrical, robust, slightly narrower behind ; antennse not passing the 

 liiud angles of the thorax, third joint twice as long as the second or fourth, 

 joints four to ten eq.ual, as broad as long, very vaguely serrate, eleventh longer ; 

 head deeply inserted, eyes oval entire; clypcus narrowed at base, trilobed in 

 front ; thorax broader than long, lateral margin entire ; under side without an- 

 tennal grooves, prosternal sutures straight, divergent in front ; metasternal epis- 

 terna moderately broad, narrower in front, the epimera slightly visible ; hind 

 coxal plates parallel ; legs moderate, first joint of hind tarsi as long as the next 

 two, fourth lobed beneath, claws dilated at base; last ventral segment more or 

 less prolonged at middle. 



This genus i.s closely related to Xylobiiis and Sarpedon, ])ut may 

 be known l)y the trilobe<l clypeus. I do not find the meta^iternal 

 episterna entirely concealed as stated by Bonvouloii". 



But one species occurs in our fauna. 



If . iiigrioornis Say. — Cylindrical, slightly narrower liehind, black, feebly 

 shining, the apical, and sometimes the basal margin of the thorax reddish ; head 

 coarsely, densely and deeply jjunctured, front marked with a deeply impressed 

 line which divides in front ; clypeus a little wider at base than the distance to 

 the eyes; thorax broader than long, arcuately narrowing at apical half to the 

 front, median line deeply and broadly impressed, a moderately deep transverse 

 impression at middle, an oblique impression within the hind angles, the latter 

 small, not carinate ; surface coarsely, closely and deeply ])unctured ; scutellum 

 oval, acute, as wide as long; elytra deeply striate, stria? coarsely punctured, in- 

 tervals convex, more finely punctured than the thorax, but quite rugose; i>ros- 

 ternum coarsely and closely punctate, the pleurte more coarsely but less closely ; 

 metathorax less coarsely and less densely punctured than the prosternum ; abdo- 

 men similarly but more closely punctate ; last ventral segment slightly prolonged 

 at middle and sinuate each side ; legs brownish. Length .32 - .38 inch ; 8 - 9 mm. 



Occurs in Ohio. 



SARPEDOIV Bonv. 



Form cylindrical, moderately robust, slightly narrower behind ; antenna? 

 slightly passing the hind angles of the thorax, joints three to ten bipectinate i-i 

 the male, deeply bilobed in the female ; head deeply inserted as far as the eyes, 

 these oval entire ; 'clypeus with the anterior border arcuate, with a slight emar- 

 gination at middle, at base narrowed to one-half ; prothorax nearly quadrate, 

 lateral marginal line acute and entire ; under side without antennal grooves, 

 prosternal sutures straight, divergent in front ; scutellum rather broad, oval at 

 tip; metasternal episterna moderately broad, broader posteriorly, the epimera 

 distinctly visible ; plates of the hind coxae slightly sinuous on the posterior bor- 

 der and slightly wider externally; legs rather short, posterior tarsi with the first 

 joint as long as the next three, the fourth joint slightly broader and excavate 

 above, slightly lobed beneath ; claws simple ; last ventral segment slightly pro- 

 longed in an olituse point. 



