NORTH AMERICAN COLEOPTERA. 15 



Florida, Haulover, March 10. Three specimens, Austin collec- 

 tion ; also collections LeConte and A. S. Fuller. 



The male has the antennal joints more abruptly dilated to middle, 

 then gradually wider to tips ; in the female the joints o-lO are 

 gradually wider from base to tip, equal in length, the last joint 

 elongate oval, feebly constricted at aj)ical third. Moi-e slender than 

 the allied species. The distinctly black color above and beneath and 

 the deeper stride distinguish it from convexus as well as the absence of 

 double punctuation on the prothorax above and beneath. Floridce 

 is stouter, paler and with the intercoxal lines of prosternum joining- 

 well marked antecoxal lines. Intromittant organ of male with the 

 side pieces finely barbed externally at tip. 



14. C convexus Say.- -Elongate ovate, or variable iu form, usually stouter 

 than the last, brown black, fuscous or paler, shining, clothed with more or less 

 dense fiisco cinereous pubescence, basal two joints of autennse and the legs yel- 

 low. Antennae as in the last. Head and thorax rather closely puuctulate, the 

 latter more densely at sides and front, the coarser punctures varying from not all 

 to very distinctly evident; the thorax is longer than wide, feebly impressed behind, 

 tbe sides in both sexes al ways more narrowed in f ron t, sometimes strongly rounded, 

 sinuate behind with the angles moderately diverging, sometimes more broadly 

 rounded and widest at base, basal plicse variable in length. Elytra wider than 

 the thorax, finely to strongly striate, striae punctate, intervals more or less con- 

 vex, punctulate ; sides rounded and narrowed from behind the humeri to apex. 

 Body beneath punctulate, much as in the last mentioned species ; prothorax with 

 the submarginal lines varying from a broken, short and faint line to a w'ell im- 

 pressed one broadly sinuate and reaching beyond the middle, intercoxal process 

 margined behind, the lines variable in front, usually in Northern and Eastern 

 specimens, extending in front of and not joining the antecoxal lines, but in 

 Southern and Western ones confluent with them. Legs as in the last, thighs 

 sometimes slightly fuscous at middle. Length .30 — .37 inch; 7.5 — 10 mm. 



Can., Mass , N. Y., Pa., Va., 111., Mich., Mo., Kans., I. T., Texas, 

 Ga., Fla., D. C. 



The antennae in the male, as iu the last, are a little stouter. A 

 species of wide range and showing considerable variation. The ely- 

 tra are sometimes paler, as are also the antennse. The hind angles 

 of the thorax and humeri of the elytra are sometimes yellow. In 

 sonie specimens from Virginia and Florida the base of the elytra is 

 narrowly rufous. The hind coxal plates are sometimes with the pos- 

 terioi- margin transverse, the fi'ee angle rounded, or narrowed ex- 

 ternally and with the angle moderately or broadly rounded ; in one 

 S|)ecimen they are seen to be distinctly dilated behind. C. insulms 

 Cand. perhaps belongs here, but, having the thorax equally wide as 

 long, it is quite as likely the next species. 



