8 



9. O. laevis, Horn, (tab. 1, fig. 10.) — Differs from all the others of the genus 

 in being almost entirely smooth and sub-opaque; the elytra are regularly oval, ex- 

 hibiting a few almost obsolete punctures irregularly placed like the foveas in Dejeanii. 

 The whole surface is very finely alutaceous, causing the sub- opaque appearance. 

 Length 17 mm. 



Habitat. — High Sierras near the head waters of King's and 

 Tule Rivers. June. 



Horn, Proc. Ac. Nat. Soc, 1S66, p. 394. 



TETRACHA, Hope. 

 (Quadrifariam.) 



Large, metallic green species which are winged but do not fly. 



Head large, eyes circular, large; labial palpi longer than maxillary, with the 

 first joint elongated; third joint of maxillary longer than the fourth; mandibles with 

 four teeth; labrum without tooth; thorax broader than long; elvtra subparallel, 

 slightly convex, broader than the base of the thorax, deeply punctulate ; scutellum 

 not visible ; a large triangular impression at the middle of the thorax. 



S . — Anterior tarsi dilated as in Omus ; last ventral segment triangularly emar- 

 •ginate ; tip of elytra subtruncate ; sutural angle rectangular. 



$ . — Last ventral segment broadly oval at tip; tip of each elytron rounded; sut- 

 ural angle obliterated. 



The larva, table I, fig. 15, also described by Dr. Horn, 1. c, p. 34, is yellowish- 

 white ; head and thorax corneous with metallic surface ; the margin of the latter 

 testaceous ; has the eyes as in Omus. Antennas with second joint longer than the 

 first and equal to the two following together. Maxillary palpi with the second and 

 third joints nearly equal, each slightly longer than the first. Length IT mm. 



This genus is represented in the United States by two species, 

 which are also nocturnal in their habits. They hide during day- 

 time under chips, and are found from Philadelphia southward in 

 every Atlantic and Gulf State. 



Tetracha Carolina, Lin., table 1, fig. 11. — Light gold-green, tip of ab- 

 domen, apical luaule of the elytra, legs and antennas luteous; thorax smooth ; elytra 

 coarsely punctured, at the middle purple and at the margin bright green. Length 

 20 mm. 



Habitat. — Georgia, Louisiana, Florida, Texas and Lower Cali- 

 fornia. 



Lin., Syst. nat., ii, 1735, p. 657; Dej., Spec, i, p. 8; Thomson, 1. c. p. 30; Horn, Trans. Am. 

 Ent. Soc, v, p. 234, (sex. char.) About a dozen varieties of this species are described from 

 Mexico, Cuba, Brazil, Chili, Peru. 



Tetraclia virginica, Lin., table 1, fig. 12. — Dark gold-green; last ven- 

 tral segment and antennas ferugineous ; thorax smooth; elytra much coarser punc- 

 tured than T. Carolina; broad lateral margin of thorax and elytra metallic-green, 

 middle black: without lunule. Leugth 20 — 24 mm. 



Habitat. — With the preceding, Texas, Louisiana, Florida, Ne- 

 braska, Pennsylvania. 



Lin., Syst. T. ii, 1735, p. 657; Thorns., 1. c, p. 41, tab. 7, fig. 7; Syn. virginata, Lin. Syst., 

 (Gmelin) T. iv, p. 1922; Horn, Trans. Am. Ent. Soc, v, p. 234, (sexual characters). 



