434 REVISION OF THE ELATERID .V. 



21. L. agon us, elongatus, picco-reneus, densius cinereo-pubescens, clypeo truncato, vix pronii- 

 nulo, thorace latitudine longiore, lateribus late rotundatis, densius punctato, postice canaliculato, an- 



gulis posticis vix obsolete carinatis brcvibus fere obtusis, elytris fusco-testaceis, striis punctatis, inter- 

 stitiis punctatis, antennis pedibusque rufo-testaceis, illis articulis 2 et 3 coniunctis 4'" vix longioribus. 

 Long. -38. 



Mater agonus Say, Trans. Am. Phil. Soc. G, 171. 



A typical specimen in Dr. Harris' collection: locality not marked. Tins species is 

 very similar to L. ectypus, but the posterior angles of the thorax are not at all produced, 

 and their apex is not acute: the ordinary carina is very small, and hardly visible. 



22. L. defin it us, cylindricus piceus, tenuiter pubescens, thorace confertissime punctato, angii- 

 tis posticis rectis non carinatis subtestaceis, elytris striis profundis punctatis, interstitiis vage punc- 

 tatis, antennis basi pallidioribus. Long. *19 — -23. 



Zicgler, Proc. Acad. Nat. Sc. 2, 2G8. 



Middle and Southern States, rare. In one specimen the elytra are brownish. 



23. L. in f emus, cylindricus, piceus, tenuiter pubescens, thorace dense grossius punctato, mar- 

 gine omni testaceo, angulis posticis rectis, non carinatis, elytris striis profundis punctatis, interstitiis 

 parce punctatis, pectoribus, pedibus antennisque basi testaceis, abdomine nigricante. Long. -15 — - 17. 



Pennsylvania and New York, not rare. The under surface of the thorax is usually tes- 

 taceous; sometimes it is fuscous, with the sutures paler. The pale margin of the thorax 

 is dilated at each angle, so as to appear like four small yellow spots: the disc of the tho- 

 rax is slightly channelled posteriorly. 



24. L. vagus, piceus, subseneus, tenuiter cinereo-pubescens, clypeo medio non marginato, thorace 

 latitudine brcviore antrorsum modice angustato, lateribus antice paulo rotundatis, angulis posticis 

 subcarinatis, acutis, divaricatis, subtilius punctato, linea dorsali pone medium lsevi, elytris confertim 

 punctatis stria suturali sola vix conspicua, basi margineque plus minusvc testaceis, apice obtuse ro- 

 tundatis, pedibus testaceis femoribus infuscatis, antennis nigris articulis 2 ct 3 tequalibus 4 to coniunctis 

 longioribus. Long. "29 — -35. 



Lake Superior, on the northern shore. This species and the next differ considerably 

 from all the others in appearance, as well as by the absence of the elytral stria?. 

 Nevertheless, on close comparison, nothing of a generic value can be found to separate 

 them. The front is indeed not margined anteriorly, but the lateral margins are slightly 

 advanced, so that it presents, in certain directions, the same truncate appearance seen in 

 other species of the genus. The body beneath is* black, slightly bronzed. The elytra of 

 the female are gradually dilated posteriorly, so as to be about one-third wider than the 

 thorax; in the male they arc parallel on the sides; in both sexes obtusely rounded at the 

 apex; the sides of the thorax, arc more rounded anteriorly in the female than in the male. 



25. L. estriatus, piceus, subseneus, cinereo-pubescens, clypeo medio non marginato, thorace la- 

 titudine fere sesqui breviore, antrorsum angustato, ct lateribus rotundato, angulis posticis subcarinatis 

 divaricatis, acutis, subtilius punctato, linea dorsali postice sublaevi, elytris subtilius punctatis, striis 

 obsoletis, basi margineque testaceis, apice obtusis, antennis basi testaceis, articulo 3'° 2 ml " longiore ct 

 4 to ;>equali. Long. "26. 



Eagle Harbor, Lake Superior. Smaller than the preceding, which it resembles very 



