NORTH AMERICAN COLEOPTERA. 257 



Variations. — The few specimens seen show no variation. 



The form of this species is more elongate than usual in this part 

 of the sei-ies recalling ignava, but not so cylindrical. In the female 

 the punctures of the thorax are filled with clay, so that the trans- 

 verse strigosity becomes evident ; in the male the thorax has rather 

 a velvety appearance. 



Occurs in Texas. 



42. li. Knocliii Gyll.— Elongate oval, very little broader behind, ferru- 

 ginous brown to piceous, feebly shining. Clypeus rather broadly and moderately 

 deeply emarginate, the border scarcely reflexed, densely rather coarsely punctate, 

 front nearly cribrate. Thorax widest at middle, subangulate, distinctly narrowed 

 to base, more obliquely narrowed in front, margin crenate, sparsely ciliate, disc 

 densely, coarsely, and at times subcoufluently punctate, a distinctly elevated 

 smooth median line, basal margin hardly depressed. Elytral punctures compara- 

 tively small and rather closely placed, except pear the apex, the sutural and first 

 discal costffi well developed, the others indistinct, the submarginal very feeble. 

 Pygidium moderately coarsely not closely punctate. Metasternura closely punc- 

 tate, the hair rather short and .sparse, in female shorter. Abdomen at sides mod- 

 erately closely punctate, the last two segments more coarsely. Claws curved, 

 the tooth strong and median, a little longer in female. Last joint of maxillary 

 palpus fusiform not impressed. Length .85— .92 inch ; 21. 5 — 23.5 mm. 



Male. — Antennal club a little shorter than the stem. Abdomen 

 slightly flattened at middle, penultimate segment flattened at middle 

 and slightly granulate, on each side a feeble oblique tuberosity. 

 Last segment feebly concave, slightly granular each side, the apex 

 acutely emarginate. Inner spur of hind tibia elongate triangular, 

 the outer longer and more slender. 



Female. — Antennal club shorter than the funiculus. Pygidium 

 more elongate, pubescent at apex. Posterior tarsi as long as the 

 male. Femora stouter than the male, especially the posterioi-. 



Variations.— The usual color is reddish-brown, with the liead 

 and thorax a little darker, in these the legs are more reddish in color, 

 and the abdomen paler than the upper surface. One specimen before 

 me is entirely piceous. 



This species is one of the largest of the central series of Lachnos- 

 terna ; this with the very closely punctate thorax with median carina 

 make it easily known. 



Occurs from Massachusetts to Georgia, but seems rare. 



43. L,. proliiiMla Blanch.— OI)long. slightly broader behind, moderately 

 robust, shining, castaneous. Cly])eus broadly, moderately deeply emarginate, 

 margin narrowly reflexed, moderately coarsely densely punctured, front more 

 coarsely punctured. Thorax widest at middle, obtusely angulate, slightly uar- 



TRANS. AMER. ENT. SOC. XIV. (.33) DECEMBER, 1887. 



