A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 83 



the apical third, but occasionally a specimen is found with the pro- 

 notum widest at the middle and the sides regularly rounded. The 

 greatest differences are found in the tips of the last visible abdominal 

 sternite and eighth abdominal tergite of the females. In some ex- 

 amples the apex of the last visible sternite is strongly biemarginate, 

 with the median tooth angularly produced, the subapical ridge 

 strongly dentate and produced into an acute, median tooth, and with 

 the apex of the eighth tergite narrowly, transversely emarginate, 

 with the lateral tooth on each side curved inward, whereas in other 

 specimens the apex of the last visible sternite is biemarginate, with 

 the median tooth obtusely rounded, the subapical ridge dentate, 

 transverse, but not produced at the middle, and the eighth tergite 

 with a small angular or semicircular emargination at the apex. No 

 differences can be found, in the males associated with the two forms 

 of females, except that the sides of the genitalia are a little more 

 strongly expanded in some specimens than in others. The length 

 is from 11 to 17 mm. 



This species is common wherever mesquite is found. The larvae 

 mine the bark and wood of dying and dead plants, and often cause 

 severe injury wherever mesquite is used for posts and firewood. 



(28) Chrysobothkis semiscxjlpta LeConte 

 (Fig. 28 ; fig. 114, E) 



Chrysobothris semisculpta LeConte, 1859, Amer. Phil. Soc. Trans, (n. s.) 11: 

 254-255; Gemminger and Harold, 1869, Cat. Coleopt., v. 5, p. 1427; Crotch, 

 1873, Acad. Nat. Sci. Phil a. Proc. [25] : CO ; Horn, 1883, Amer. Ent. Soc. Trans. 

 10: 287; Blaisdell, 1892, Insect Life 5: 33 (misindentification, probably 

 mail) ; Fall, 1901, Calif. Acad. Sci. Occas. Papers 8: 22, 117; Woodworth, 

 1913, Guide to California Insects, p. 196. 



Chrysobothris contiyua LeConte, 1859, Amer. Phil. Soc. Trans. 11: 255; Gem- 

 minger and Harold, 1869, Cat. Coleopt., v. 5, p. 1424; Crotch, 1873, Acad. 

 Nat. Sci. Phila. Proc. [25] : 90; Horn, 1883, Amer. Ent. Soc. Trans. 10: 286; 

 1886, Amer. Ent. Soc. Trans. 13 : 79-81, pi. 2, figs. 35-39 ; Woodworth, 1913, 

 Guide to California Insects, pp. 194, 196; Chamberlin, 1917, Ent. News 28: 

 135; 1925, N. Y. Ent. Soc. Jour. (1924) 32: 190 (separate, p. 189) ; 1926, 

 Cat. Buprestidae North Amer., p. 144; 1929, Pan-Pacific Ent. 5: 110-111, 

 115, fig. 4; Obenberger, 1934, in Junk (pub.), Coleopt. Cat, pt. 132, p. 616. 

 (New synonymy.) 



Chrysobothris purpurifrons Motschulsky, 1859, Soc. Imp. Nat. Moscou Bui. 32: 

 183-184 ; Gemminger and Harold, 1869, Cat. Coleopt., v. 5, p. 1427 ; Kerremans, 

 1892, Soc. Ent. de Belg. Mem. 1 : 218 ; Woodworth, 1913, Guide to California 

 Insects, p. 196 ; Lange, 1937, Pan-Pacific Ent. 13 : 173. 



Male. — Moderately elongate, rather strongly depressed above, moderately shin- 

 ing, piceous, with a distinct cupreous or k aeneous tinge, the pronotum slightly 

 more cupreous; beneath cupreous, with a distinct greenish reflection, and more 

 strongly shining than above. 



Head bronzy brown, with a faint cupreous tinge, brilliant green along anterior 

 margin of clypeus, with an obscure longitudinal carina on occiput ; front moder- 

 ately convex ; surface coarsely, densely, shallowly punctate, slightly, transversely 

 rugose behind the clypeus, sparsely clothed with long, semierect, whitish hairs, 

 the intervals vaguely granulose ; clypeus with a narrow, angular notch at middle, 

 on each side of which is a distinct, acute tooth, and transversely sinuate externally. 

 Antenna uniformly bronzy green, slightly narrowed to apex ; intermediate seg- 

 ments wider than long, subtriangular, broadly rounded at outer margins ; third seg- 

 ment subequal in length to following two segments united. 



Pronotum twice as wide as long, subequal in width at base and apex, widest 

 near apex ; sides strongly converging at apex, obliquely converging and slightly 



