AMERICAN COLEOPTERA. ^41 



in the two tables which precede, as it may happen that some cabinet 

 will contain a male or a female not in the appropriate table, but which 

 may be already known only in the opposite sex. 



Front rather deeply impressed above the frontal suture densicoUiS. 



Front not impressed. 



Metasternum rather densely punctured and with long dense pubescence. 



Thorax very densely and coarsely punctured jmberulns. 



Thorax rather sparsely punctured obtusus. 



Metasternum sparsely punctured at least at middle, pubescence sparse. 



Thorax unevenly punctured, dense along the apex, pyg.dium coarsely 



, timiuns. 



punctured 



Thorax with large punctures very unequally placed, pygidium nearly 



,, senex. 



smooth 



Of the above species the males only are known of puberulus and 

 obfusus, and the females only of densico/lis, timidus and senex. 



L disnarilis n. sp.-Subcylindrical. moderately robust, brownish, moder- 

 ately shining, very faintly pruinose, surface sparsely clothed with very short 

 pubescence. Head densely and coarsely punctured, frontal suture not im- 

 pressed, clypeus transverse, subtruncate in front with broadly rounded angles 

 and narrowly reflexed margin. Thorax more than a half wider than long, 

 narrower in front than at base, sides anteriorly moderately arcuate, posteriorly 

 distinctly sinuate, hind angles rectangular, margin coarsely crenulate and 

 sparsely fimbriate with yellowish hairs; disc moderately convex, rather coarse y 

 and irregularly but not densely punctured. Elytra coarsely but not deeply 

 punctured, sutural costa moderately distinct, disc faintly subcostate, the inner 

 more distinct, margin fimbriate. Body beneath moderately densely clothed 

 with long yellowish hair. Abdomen sparsely punctate and with very short 

 hair. Length .72 inch; 18 mm. ,. , „ ^ ., a 



Male -Club of antennae longer than the funicle. Abdomen slightly flattened 

 at middle, last two segments with an impressed line at middle, last ventral 

 very slightly notched at middle. Pygidium convex, coarsely and very sparsely 

 punctured near the tip, more closely and more finely at base. Anterior claws 

 similar, each pectinate along a double margin and with one of the pectinations 

 at middle somewhat longer and stouter than the others. Middle claws simi- 

 larly pectinate but without any larger pectination. Posterior claws pect.na e 

 in the same manner as the anterior claws. Spurs of hind tibiae slender, acute 

 and similar, the outer one-third longer. Inner side of posterior t.bi^ with a 



few stiff hairs. 



Femah.-G\nh of antenna longer than half the funicle. Abdomen convex at 

 middle, last ventral more coarsely punctured. Pygidium sparsely punctate, 

 broadly transversely impressed near the tip, apical margin slightly prolonged. 

 Anterior claws similar, each serrulate and with a stron. acute tooth at middle. 

 Middle and posterior claws similarly formed. Spurs of posterior tibiae rather 

 broader than in the male, slightly arcuate, and with a distinct pellucid margin. 

 The claws of the female are also distinctly pectinate along a double margin, 

 the tooth arising from that margin most distant from the other claw. 



This species has entirely the facias of a Lachuosterna of the fasca 



