AMERICAN COLEOrTERA. 75 



0. ovale, n. s]\ — Elongate oval, sides of thorax JubpTrallel behind the middle. 

 Elytra oval, finely 15 striate, punctures small rather close, interspaces flat. Head 

 above the eyes sparsely punctured, vertex shining metallic green, margin of 

 front along the suture, clypeus and labrum pale. Thorax coarsely punctured 

 over its entire surface, more densely near the base and ajiex, median line moder- 

 ately impressed; with a transverse nearly black faintly bronzed band extend- 

 ing nearly to the lateral margin and broadly along the median line to base and 

 apex; the pale spaces therefore consist of a subquadrate spot at each angle 

 united by a narrow line along the lateral margin. Elytral disc brownish 

 black with feeble lustre and scarcely at all bronzed; margin pale with three 

 processes on each side extending inwards, the first behind the humerus broadly 

 triangular extending to the 11th stria, the second behind the middle, narrower 

 and with irregular borders extending slightly obliquely forward to the 10th 

 stria, the sub-apical process is sub-quadrate, parallel with the suture and 

 emarginate at its inner and front sides; in addition a small, badly defined ob- 

 lique spot on each side near the scutellar region, a rhomboidal spot near the 

 apex of the first lateral process and an irregular feebly sinuous band near apex 

 of the second process and extending toward the suture. Scarcely any metal- 

 lic lustre is seen exr/epting at the basal region and along the anterior third of 

 the suture. Under surface ferruginous brown, apex of abdomen paler. Length 

 .26 inch; 6.5 mm. 



Kasily koowa from any other of our species by its more elongate 

 form, finely striate elytra witli flat interspaces. In one specimen be- 

 fore me the thorax is subparallel behind the middle, the other has 

 the sides distinctly divergent to the base. 



Two specimens, 9 % , Fort Crook, California. 



In glancing over our species, two forms of elytral marking are seen. 

 In one. group the dark or metallic spaces resolve themselves into three 

 transverse rows of spots, basal, submedian, and sub-apical. The njar- 

 gins are pale and the darker spots occupy much less space than the 

 pale portions. In the second group the margin alone is pale with 

 three branches extending inwards, invading for a very short distance 

 the darker color of the disc; an occasional pale spot may bo found in 

 the dark discal space. In accordance with the extent of the dark 

 iliscal .space, our species may be arranged as follows; 



1. labia fum ; 4. ohlitcratum ; 5. amcricamnn; 

 2. nif Ilium ; 3. ovale; 

 while those in which the pale colors prevail ; 



1. rohiistam ; 3. dentatum ; 



2. (jikn ; 4. tesselatum ; 



the first being the paler, while the groops approach each other 

 through aniericanum and fesseldfnm. The species all vary 

 somewhat in the extent of their markings and the preceding remarks 

 apply only to a general view of several specimens of each. 



