970 



FAMILY L. SOAEABJ5ID2E. 



1819 (10,238). Lachnosterna arcuata Smith, Insect Life, I, 1888, 183. 

 Resembles fusca in form, size and color. The males can be easily sep- 

 arated by the ventral characters, the ridge of the fifth segment being very 

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

 of the segment, while the 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 dulria it is punctured. The females are distinguished from 

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

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

 plates" being large and quadrate, while those of duMa are narrow and 

 linear. (PI. Ill, fig. 389.) 



Porter, Monroe and Posey counties; scarce. May 13-June 29. 



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

 Resembles fusca in all outward appearance, the ventral characters of 



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

 curved than in arcuata 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 pubic process broad, stout and forked at apex, 

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

 flattened and obliquely truncate; the superior plates narrow and linear. 

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



Lake, Kosciusko, Vigo and Crawford counties; frequent. May 

 10-June 19. Probably throughout the State. The clypeus is more 

 distinctly emarginate than in fusca. 



1821 (10,241). Lachnosterna gkandis Smith, loc. cit, p. 181. 

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



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

 carina? 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; pubic 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 counties ; scarce. April 18-June 16. 



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



VII, 1856, 250. 



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

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

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

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

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

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

 Elytral punctures rather fine and moderately close, the costae distinct, but 

 narrow and feebly elevated. Male with antenna! club a little longer than 



