118 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ii4 



Females. — Length 6.6 to 8.3 mm., width 3.7 to 4.7 mm. The 

 females differ from the male majors in the following respects: Clypeus 

 broadly rounded, only very weakly reflexed, slightly more so ante- 

 riorly than laterally; surface strongly rugosely punctate, sparsely 

 setigerous; clypeal carina strong, quite evenly elevated, only slightly 

 higher medially than laterally; setigerously punctate behind the cari- 

 na, rarely some of the punctures with an accompanying small tubercle ; 

 carina of vertex slightly arcuate anteriorly, slightly higher medially 

 with no indication of lateral horn; behind the carina several rows of 

 setigerous punctures followed by an impunctate area ; gena not prom- 

 inent, the margin almost evenly continuous with the clypeal margin. 

 Pronotum less convex than in male major; pronotal protuberance only 

 vaguely indicated by a broad, anterior, median swelling; punctures 

 similar to male, but the setae arising at the base of the punctures 

 often more pronounced, particularly on the disc. Elytra as in male 

 but often with slightly longer setae. Pygidium similar to that of 

 male but not as convex. Legs slightly stockier than those of male, 

 forelegs considerably shorter than in male major, femur not reaching 

 lateral thoracic margin ; the tibial spur elongate, gently recurved, not 

 thickened as in male; legs of female otherwise quite similar to those 

 of the male. Last abdominal segment not medially emarginate. 



Type. — Present location unknown to us. 



Type locality. — "America Borealis." 



Specimens examined. — 2111. 



Distribution. — (See fig. 11.) 



Taken in Alberta, British Columbia, Saskatchewan, Manitoba, 

 Ontario, Quebec, New Brunswick, and Nova Scotia in Canada, and 

 in every State in the United States except the far western States of 

 Washington, Oregon, California, and Nevada. 



Remarks. — This species may be distinguished from allied species 

 by the sexual characters of the male majors and by the pronounced 

 elongate pronotal tubercles usually separated by a distance less than 

 their own length. The lateral pronotal setae are usually yellowish, 

 and the elytral tubercles, though not as pronounced as those of the 

 pronotum, are still large, each usually with a yellowish basal seta. 

 Dorsal color is ordinarily distinctive, being entirely black with an 

 occasional aeneous glint. 



Southward there is a gradual change from typical 0. hecate to the 

 subspecies described by Brown as 0. blatchleyi. The pronotal pro- 

 tuberance becomes broader and shorter with less crowded tubercles, 

 the median projection of the protuberance, which in northern speci- 

 mens terminates in two well-developed separate teeth, develops into 

 a longer binodose process in the specimens from the Carolinas and 

 Florida, and the apical brown spots of the elytra become larger and 



