510 NOTES ON LACHNOSTERNA. 



The claspers of the male genitalia are very lightly and gracefully 

 built, and very strongly dissimilar. The female characters, on the con- 

 trary, are small, and not at all well developed. The figures must be 

 referred to for details. 



46. L. hornii Smith. 



Oblong oval, not broader behind, convex, very deep brown or piceous, 

 shining; clypeus moderately deeply emargiuate, rather more acutely in 

 the female ; margin narrowly reflexed, rather coarsely, densely punct- 

 ured, front scarcely less densely punctured. Thorax distinctly nar- 

 rower in front; sides very obtusely angulate, widest behind the middle, 

 narrowed to base, more obliquely narrowed in front; margin feebly 

 crenate, sparsely ciliate, disc convex, the punctures moderately coarse, 

 variably placed, sometimes closely and equally, sometimes sparsely and 

 irregularly on the disc, leaving smooth spaces, but no smooth median 

 line, a distinct depression of the basal margin externally. Elytral 

 punctures finer, much more dense, somewhat rugulose, costai evident. 

 Pygidium moderately and somewhat irregularly punctured, less densely 

 so in the female. Metasternum densely punctured, the hair long and 

 dense in the male, short and sparse in the female. Abdomen finely 

 punctate, more dense at the sides, the last two segments much, more 

 coarsely and densely. Last joint of maxillary palpi fusiform, not im- 

 pressed. 



Length .75-.85inch; 19-2l mm . 



Habitat— Washington, D. C, Tennessee, Virginia, Ohio. 



Male. — Antennal club slightly longer than the funiculus. Penulti- 

 mate segment with a very strongly elevated, overhanging arcuated 

 crest, occupying nearly the entire length of the segment, behind which 

 there is a deep, transverse punctured impression. In some specimens 

 the crest is divided at the middle, and a longitudinal impression extends 

 forward to the middle of the preceding segment. Last ventral with a 

 quadrate punctured impression, the hind margin with a small deep 

 emargination. Claws arcuate, tooth rather extra median, shorter than 

 the female. The fixed spur is quite short, less than half the length of 

 the outer, and proportionately less stout. 



Female. — Antennal club shorter than the funiculus. Pygidium more 

 elongate, the punctures smaller and more sparse. Posterior femora 

 stouter, spurs of hind tibitc short and stout. Penultimate ventral seg- 

 ment with a strongly impressed line near the hind margin, behind 

 which the segment is depressed. Last ventral segment sinuate at 

 apex, scarcely emargiuate. Tarsi not shorter than in the male. 



Variations. — In a series of nine specimens no variations are observed. 

 The species is remarkably constant in form and color. 



About a dozen specimens of this interesting form were takeu at 

 Washington during the present season (1888). None of the local col- 

 lectors had ever taken it before. As will be seen by the record of capt- 

 ures heading this paper, the specimens were rarely taken. . T picked 





