NATURAL SCIENCES OF PHILADELPHIA. 379 



8. S. an c e p s Zee, Pac. R. R. ExpL, xi, 2. 28 ; S. rotundicollis Motsch. Bull. 

 Mosc. 1859, ii, 135. 



9. S. c i n c t i c 1 1 i s Lee, Proc. Acad. Nat. Sc, Phil., 1858, 60. 



10. S. unicolor DeJ., Sp. Gen., iv. ^11; Mannh. Bull. Mosc, 1843, 214. 



11. S. flavipes Lee. Proc. Acad. Nat. Sc, 1858, 60. 



12. S. ochropezus Dej'., Sp. Gen., iv, 424; Feronia ochr. Say, Trans. 

 Am. Phil. Soc, ii, 54 ; S. convexicolUs Lee, Ann. Lye, N. York, iv, 404. 



13. S. d i s s i m i 1 i s Dej., Sp. Gen., iv, 424. 



14. S. h y d r p i c u s Lee, New Spec. Col. (Smiths. Inst.), 17. 



15. S. c ar u s Lee, ibid., 18. 



17. S. longulus Lee, List Col. N. Am., 13; Acupalpus long. Dej., Sp. 

 Gen., iv, 459. 



18. Acupalpus rectangulus Chaud., Rev. and Mag. Zool., 1868. 



19. S. a 1 1 e r n a n s Lee, Trans. Am. Phil. Soc, x, 386 ; Badister testaceui\\ 

 Leo. Proc. Acad. Nat. Sc, Phil., ii, 252 ; Aepus test. Lee Ann. Lye, N. York, 

 iv, 413, Philodes alt. Lee, Class. Col. N.Am., 1, 33. 



20. S. tener Lee, Pac. R. R. Expl., xi, 2, Ins. 29; Philodes tener Lee, 

 Class. Col. N. Am., i, 33. 



BRADYCELLUS Er. 



The elytra are obliquely but feebly sinuate at tip, and never subtruncate 

 as in the species of Stenolophus. 



This genus contains both large and very small species, and, like Stenolo- 

 phus, may be divided into groups according to the dilatation of the male tarsi ; 

 it may be distinguished from the other two genera by the mentum being 

 armed with a large acute tooth, though in some of the smaller species it is 

 sometimes difficult to perceive this character without the aid of a compound 

 microscope ; and even then the tooth is sometimes rendered less apparent, 

 when the ligula is extended, by the basal portion of that organ ; I believe, 

 however, that I have by careful examination satisfied myself of the existence 

 of the mentum-tooth in all of the species which I now refer to the genus. 



Some of the smaller species of division B closely resemble in appearance 

 Agonoderus, but may be usually known by the more slender antennye and 

 hind tarsi, and by the much shorter scutellar stria, which is sometimes in 

 fact entirely wanting ; a reference to the mentum, to verify the proper 

 character belonging to the genus, should be always made in doubtful cases. 



Baron Chaudoir regards the 1st division as constituting a distinct genus, 

 Tachycellus Moravitz, but in view of the sexual differences observed in 

 Stenolophus, I am scarcely prepared to adopt his opinion ; I prefer there- 

 fore, for the present, to group the species as follows : 



A. Front tarsi of male moderately dilated, middle tarsi less dilated, with 

 two rows of squamiform papillae beneath ; elytra with a long scutellar stria. 



a. Basal bead of prothorax well defined for its whole extent. 



10 — 11 mm. Ferruginous, elytra black, iridescent, deeply striate ; prothorax 

 scarcely narrowed behind, sides broadly rounded and widely depressed, hind 

 angles obtuse, somewhat rounded ; base finely punctured. ... 1. d i c h r o u s. 



9 — 10 mm. Color as in the preceding; prothorax narrowed behind, sides 

 rounded in front, oblique behind ; hind angles scarcely rounded ; base finely 

 punctured; basal impressions more strongly marked 2. vulpeculus. 



8 mm. Black ; prothorax narrowed behind with small basal impressions, 

 hind angles obtuse, not rounded ; antenn* and feet ferruginous. 



3. autumnal! s. 



b. Basal line of prothorax interrupted or nearly obliterated at the middle. 



5 — 6 mm. Blackish ; bead of prothorax pale ; elytra piceous or dark tes- 

 taceous ; body more slender; protborax distinctly narrowed behind; hind 

 angles obtuse rounded ; basal impressions well marked, sparsely punctured ; 

 legs ferruginous, thighs and tips of tibiae sometimes darker; 1st joint of an- 

 tennae pale 4. b a d i i p e n n i 8. 



1868.] 



