970 FAMILY L. SCAKAB.iaD^'E. 



1819 (10.238). Laciinosterna arcuata Smith, Insect Life, I, ISSS, 183. 

 Resembles fitsca in form, size and color. The males can be easily scp- 



ai-atwl by tlie ventral characters, the ridge of the fifth segment being very 

 mucli curved, very much overhanging, tlie ends reaching the apical margin 

 of the segment, wliile tlie arch, combined with the depression of the last 

 segment, forms a perfect oval. The space included by the arch of the ridge 

 is smooth, in duhia it is punctured. The females are distinguished from 

 those of fusca by having the last ventral segment emarginate. From th(jse 

 of dtiNa they can be known only by the genital structure, the "superior 

 plates" being large and qnndi-ate. wliile those of diihui are narrow and 

 linear. (Tl. III. fig. .380.) 



Porter, IMonroe and Posey eoiintios; scarce. ^lay 13-June 29. 



1820 (10,240). Lachnosterna dubia Smith, loe. cit., p. 183. 

 Resembles fusca in all outward ajipearance. the ventral characters of 



the male alone separating that sex. The ventral ridge is decidedly less 

 curved than in (trcuiita and more curved and in every way more distinctly 

 marked than in fusca. overhanging or projecting like a ledge behind for its 

 full length. Female with the luibic process broad, stout and forked at apex, 

 as in arcuata. but twice as long as there, the branches broad, somewhat 

 flattened and obli(piely truncate; the superior plates narrow and linear. 

 Length 17.5-23 nun. (PI. Ill, fig. 390.) 



Lake, Kosciusko, Vieo and Crawford counties; frequent. INIay 

 ]0-June 19. Prohal)ly tliroughout the State. The clypeus is more 

 distinctly emarginate tlian in fi(.^ca. 



1821 (10.241). Lachnosterna grandis Smith, loc. cit., p. 181. 

 Resembles fusca. but usually larger and more robust. Sides of thorax 



more subangulate before the middle and upjier surface much smoother, the 

 carinse of elytra being less distinct and the punctures finer, so that it has a 

 glossy or satiny appearance. Male with ventral ridge without a perceptible 

 curve, not overhanging; last ventral granulate-punctate. Female with last 

 segment emarginate and the middle of abdomen, especially toward the base, 

 distinctly punctate; iiubic process deeply forked, the branches much more 

 slender than in the two preceding species. Length 21-23 mm. (PI. V, 

 fig. 400.) 



Steuben, Putnam and Vigo coutities: scarce. A]>ril 18-June IB. 



1822 (5771). Lachnosterna jiarginalis Lee. Journ. Phil. Acad. Nat. Sci.. 



VII, 1856, 250. 

 Oblong, rather slender, slightly broader behind. Reddisli- or chestnut- 

 luMwn to piceous, shining. Clypeus moderately emarginate, its surface 

 deeply and rather coarsely, the front more coarsely punctured. Thorax 

 lu-oadest at base, sides curved from middle to apex, margin slightly irregu- 

 lar, with short cilijie; surface very coarsely, sparsely and irregularly punc- 

 tured, with large smooth places on each side slightly in front of middle. 

 F]yli-;ii i)unctures rather fine and moderately close, tla^ costa' distinct, but 

 n!iri-(]\v aud feebly eicv.-ilcd. .Male with aiiteunal cluli :i little longer than 



