ill' 1 1 1 1 : l N1TEO STATES. |.i.~i 



rufo-bivittato, elytria I . atriia tenuibua vix punctulatis, interstitiia planis, dense acabi 



t is, abdomine, prosterni lobo, thoracis parte inflexa, antennarum articulo I , pi lil a \ 

 1. mg. -28— -37. 



Lake Superior: one specimen with the thorax blackish green, and two with a broad 

 discoidal reddish yellow vitta each side. This species i- less bIi ader than A. viridanus, 

 ami the thorax is more broadly rounded anteriorly, so that it appears less cylindrical. 

 Tlir postpectus is black. 



A specimen Pound with those just mentioned lias the thorax entirely greenish black, 

 above and beneath, with the sides much more straight, converging slightly ami rounded 

 only near the apex; the disc is punctured as in this species, hut ha- two anterior fovea 

 a- in A. viridanus; the abdomen, like the pectus, i- black, ami does nol Bhow an) reddish 

 tinge. This may be a distinct Bpecies, hut until the sexual differences are better under- 

 stood, I think it better to permit it to remain under A. incongnius. 



I.rnu s hilr. 



1. L. abraptns, niger, dense punctatns, rusco-eubsericeus, tarsia piceis; elytria posticc obsolete 

 Btriatis, ad apicem dod acuminatis. Long. '8. 



/. ■' < - Say, Ann. Lye. 1, 258; Trans. Phil. Soc. 6, L66. 



Ludiru 'is Germ. Zeitschr. I, 17. 



Middle, Southern, and Western States; rare. 



-. L. attenuatus, obscure piceo-sanguincus, dense punctatns, fusco-subsericeus, elytri 

 npicera, an tennis, pedibnsqne nigris, i lytris posticc vix obsolete striatia apice acuminatis. I. r. •'.'. 

 Elai .■". Ann. Lye. 1, 257; Trans. Am. Phil. Soc, 6, 166. 



Middle. Southern, ami Western States; more abundant than tin- preceding. 



Doloph - Esch. 

 Latreille and Germar have alreadj asserted thai the genera Dolopius, A.griotes, and 

 Ectinus, of Eschscholtz, were separated on evanescent characters; ami after patiently ex- 

 amining our native -p. cies I have adopted then- opinion. Differences of organic character, 

 although too slight l>r if m rie distinction, are readily found, and enable us to facilitate die 

 determination of the species, which may be grouped as follows: 



A. Mandibnlss perpendicnlariter dilat ipice eraarginatse - - Sp. I. 



!'.. Mandibulse apice compressa-, non I 



1. Antenna; articulis 2 et 8, l 'i niuncti eeqnalibua 8p. '-' 



_'. Antennae articnlia _ el - ; . I" jingnlia fix brevioribus. 



* Laminae ooxarum into rii j, (thoraois margine plus minus ol 



]ef. : , Sp. I 



** Laminae m iotas rabito panlo dilatatse, (thoracis i in 



tcgro:) -....- . Sp. I- I 



1. 1». manens, craseiusculus, I piceus, pubi 



VOL. X .— -i ■' 



