758 BOSTON JOURNAL 



2. 0. 4-NOTATUS nob. Long's Expedition. 



The male is almost destitute of spots on the second segment of 

 the tergum, and all the tibiae have a white line. 



This species resembles the 0. trispinosus Fabr., but that insect 

 may be distinguished by the dilated figure of the spot on the basal 

 segment of the tergum and by the tibiai being entirely honey- 

 yellow. 



3. 0. L^TUS. — Line on the collar, on the scutel and five lateral 

 spots on the tergum yellow. 



Inhabits Indiana. 



% Body black, punctured ; head with a slight silvery reflec- 

 tion : antennae ferruginous : mandibles yellow, piceous [376] at 

 tip : collar with a transverse, somewhat undulated yellow line, 

 interrupted in the middle : scutel with a double, transverse, yel- 

 low spot ; metathorax with the middle spine simple ; the lateral 

 ones depressed, whitish, margined on the inner side with bright 

 yellow : tergum with five yellow spots on each side : knees, tarsi 

 and tibiae yellow, the latter with a dilated black line on the inner 

 side. 



Length nearly one-fifth of an inch. 



Smaller than mucronadisV., which is destitute of the scutellar 

 line. It may be distinguished from the preceding species, by the 

 yellow color on the collar and scutel. 



CR ABRO Fabr. 



C. CONFLUENTUS [coNFLUENs]. — Black, with large confluent 

 punctures ; tergum interruptedly fasciate. 



Inhabits Indiana. 



9 Body black, densely and confluently punctured, particularly 

 on the stethidium, where they are sometimes longitudinally con- 

 fluent, so as to exhibit lines between them ; they are largest on 

 the metathorax ; hypostoma and anterior orbits behind the basal 

 joint of the antennae, silvery : antennce, basal joint yellow; sec- 

 ond joint honey-yellow ; collar yellow, slightly interrupted in the 

 middle: scutel with a large, transverse, yellow spot; a yellow 

 transverse line behind it ; wings slightly tinged with dusky : 

 abdomen oval, rather abruptly narrowed at base : tergum with 

 the incisures contracted, the segments being convex; approxi- 



[Vol. I. 



