AMERICAN COLEOPTERA. 91 



9. JI. biplagiata Hel. Pr. Ac. Nat. So. Phila. xvi. 105. (PI. II, fig. 22). 



A variable species both as regards size and markings ; a specimen from 

 northern Illinois, found among Dr. LeConte's undetermined material, 

 agrees in all respects with Helmuth's description, and from this the 

 figure was made. A specimen collected in the Catskills while agreeing 

 perfectly in the markings is only 1.7 mm. in length; another collected 

 in the Adirondack's is nearly 4 mm. in length and the humeral spot is 

 unusually large and diffuse. The coloration in other respects is a little 

 different, but not enough to authorize a sp. nov. Readily distinguished 

 from the other species in this section by the humeral spot of the elytra. 



10. Iff. inter mixta Hel. Pr. Ac. Nat. Sc. Phila. xvii, 96. 



Readily recognized by the contrast in color between the thorax and 

 elytra, the latter of which is sometimes more rufous. Specimens from 

 California and New York, (Adirondack Mts.), agree in every respect with 

 each other and with the description. I have found it rather rare. 



11. M. vilis Lee. Pr. Ac. 1856, p. 76, {Mordella). 



I have seen but very few specimens ; differs from all other species in 

 this section by its uniform black color. 



12. M. vapida Lee. Pr. Ac. Nat. Sc. Phila, xiv, 49. 



Does not seem to vary much. I have found it occasionally in the 

 vicinity of New York. 



13. M. decorella Lee. Pr. Ac. Nat. Sc. Phila. xiv, 49. (PI. II, fig. 24). 

 Distinguished from the others in this section by the variegated elytra. 



I have seen only a single specimen (Dr. LeConte's type), so do not know 

 much of it. The combination of tibial and tarsal ridges peculiar to this 

 and the two following species is shown PI. II, fig. 23. 



14. M. bipustulata Hel. Pr. Ac. Nat. Sc. Phila. xvi, 105. 



I have what I consider a specimen of this species with the thorax 

 entirely black, collected in New York ; readily distinguished from the 

 other species of this group by its dark color. 



15. ML atriceps sp. nov. 



Distinguished from the preceding by the paler color, larger size, 

 heavier form, and the longer and unusually oblique tibial ridges. One 

 specimen only ; my collection. 



16. M. picipeiiiiis sp. nov. 



The combination of tibial and tarsal ridges peculiar to this and the 

 two following species is shown PI. II, fig. 25. Distinguished from the 

 others in this group by not having the elytra variegated. Three speci- 

 mens, New York ; two, my collection ; Georgia, one, Coll. Dr. Horn. 



