84 PROCEEDINGS OF THE NATIONAL MUSEUM vol. im 



with nearly straight carina present but not pronounced, often obsolete 

 or depressed medially; scattered, coarse, setigerous punctures behind 

 it. Pronotum less convex, alutaceous appearance and punctures 

 more pronounced than usual in male majors. More conspicuous 

 punctures or tubercles are often noted on elytral, pj^gidial, and ventral 

 surfaces of male minors, but in other respects these areas do not differ 

 significantly from the male majors. Forelegs of male minors not 

 greatly elongated but not as robust nor with the four teeth as large as 

 in females, the apical conical projection small or absent, the pencil of 

 hairs lacking, and the tibia only slightly bent in outer half. In other 

 respects the legs do not differ greatly from the male majors. 



Females. — Length 3.3 to 4.6 mm.; width 2.1 to 2.8 mm. Differing 

 from male majors in the following respects: Head with clypeal margin 

 shallowly reflexed anteriorly and laterally, usually broadly emargi- 

 nate anteriorly; disc coarsely, often rugosel}^, setigerously punctate; 

 clypeal carina present, highest medially; frons alutaceous with scat- 

 tered, coarse, setigerous punctures; carina of vertex straight, often 

 depressed medially and no more pronounced than clypeal carina, 

 vertex behind carina with an irregular row of setigerous punctures. 

 Pronotum less convex, the punctures and setae often more pronounced 

 than in male majors. Punctures of elj^tra, pygidium, and ventral 

 surfaces hkewise often more pronounced, but not differing greatly 

 in other respects. Last abdominal segment not narrowed medially. 

 Forelegs not lengthened, the apex of the front femora not extending 

 to pronotal margin. Foretibia stocky and nearly straight; the four 

 marginal teeth large, the margin serrate between and above the teeth; 

 apical projection and pencil of hairs lacking. Legs in other respects 

 similar to male. 



Type. — Unkown to us. 



Type locality.— "Pennsylvania, Kentucky." 



Specimens examined. — 1428. 



Distribution. — (See fig. 2, p. 20.) Colorado, South Dakota, and all 

 States east and south of these except New Mexico, Vermont, and Maine. 



Kemarks. — Several early workers confused this species with the 

 common European 0. ovatus (Linnaeus); this confusion persisted in 

 our literature as late as 1928 when Leonard listed the name in his 

 "Insects of New York." We have seen no specimens of ovatus from 

 North America. Hamilton (1889) and others have pointed out the 

 error in early records. 



0. pennsylvanicus is a common, wide-ranging eastern species that 

 may be distinguished from related species by the uniform dull or fee- 

 bly shining black or piceous color, the unornamented pronotum which 

 is coarsely, rather uniformly punctate; each puncture usually bearing 

 a reddish seta and separated from its neighbor by approximately a 



