148 Memoirs on the Coleoptera 



addition to the evidently Nebriid genera Pelophila and Leistus, as 

 well as Nebria, the genera Opisthius Kirby and Notiophilus Dum. 

 In my opinion Notiophilus should form a group by itself, the sub- 

 apically emarginate anterior tibiae, as well as the general habitus 

 of the body, being radically different from that of the associated 

 genera, and Opisthius might much better be placed with Elaphrus, 

 as a member of the Elaphrini, in spite of the fact that the anterior 

 tibiae of Elaphrus are emarginate internally near tip, while in 

 Opisthius they are simple and merely coarsely grooved beneath 

 apically as in Leistus, Nebria and Pelophila. The general habitus 

 and peculiar scheme of sculpture in Elaphrus and Opisthius* are 

 identical, and these general features outweigh modifications of 

 special organs or appendages. The following is a hitherto unde- 

 scribed species of Leistus, recently discovered in northern California 

 by Mr. Nunenmacher: 



Leistus longipennis n. sp.— Body very narrow, elongate and sub- 

 parallel, with relatively large head and prothorax, shining, evenly some- 

 what dark rufous in color throughout, the legs concolorous; head as 

 long as wide, more than three-fourths as wide as the prothorax, with 

 moderately large and very prominent eyes; transverse nuchal depression 

 deep; surface smooth, with some close fine strigilation near the anterior 

 angles; mandibles broadly inflated externally, the very wide external 

 depression with a small setigerous puncture anteriorly, the apices abruptly 

 narrowed and finely aciculate; antennae long, fully half as long as the 

 body and extremely slender, pale, the first four joints glabrous, the 

 fourth only two-thirds as long as the third joint and three-fifths as long 

 as the fifth; prothorax strongly inflated, one-half wider than long, 

 widest at the middle, at which point the margin is somewhat more 

 widely reflexed than anteriorly or posteriorly; sides subevenly and 

 strongly rounded, becoming abruptly parallel for a short distance at 

 base, the angles sharp and right; base transverse, four-sevenths the 

 maximum width and equal in width to the apex, which is bisinuate; 

 surface convex and very smooth, the anterior transverse impression 

 very broad, deep and sparsely punctate, the posterior deep, narrower and 

 broadly angulate, the surface sparsely punctate thence to the base; 



* The species Opisthius indicus, of Chaudoir, evidently represents a genus different 

 from the subarctic American Opisthius, which may take the name Paropisthius (n. 

 gen.), if not already named. The body is less ventricose, nearly as in Elaphrus, hut 

 with the sides of the prothorax very prominently lobed; the maxillary palpi are trun- 

 cate and not bluntly pointed at tip, the epistomal suture transverse and not sinuate, 

 and the large elytral foveae are not finely umbonate at the centre as in Elaphrus and 

 Opisthius, but have perfectly flat floors, with a minute central puncture and also with 

 about four fine longitudinal striiform series of minute punctures. The femora and 

 tibia? are pubescent in Opisthius and glabrous in Paropislhiui,. 



