AMERICAN COLEOrTERA. 73 



third are two spots similar to the last, the first between striaj 3 — 6 the 

 second between striaj 9 — 13, these are united by a narrow band arching 

 forwards. The under surface is pale brownish with the sides and apes 

 of abdomen paler. Leneth .28 inch; 7 mm. 

 From the margins of the Gila River, Arizona. 



0. robustum, n. sp. 



Similar in form to the preceding species but rather more convex, 

 robust and shining. The length of the elytra as compared with the 

 breadth is shorter than any other of our species. The thorax is com- 

 paratively shorter than in gilx, the punctures coarse but with the 

 marginal and the dark discal space almost free from punctures. Head 

 with but few punctures, front pale yellowish, vertical and post ocular 

 regions and a narrow line above the eyes brownish ; clypeus pale ; 

 labrum silvery-white. The thorax has a narrow transverse band of 

 metallic green color slightly extending forwards and backwards on the 

 median impressed line and an oval brownish spot on each side between 

 the metallic band and the margin. The elytral sculpture consists of 

 striae of rather coarse punctures distantly placed, the striae themselves 

 very feebly imprcs.sed. The ornamentation is similar to that seen in 

 gilse, but the narrow black basal line is absent as also the dark sutural 

 line between the scutellar region and the position of the second row. 

 and also that posterior to the third row of spots. The color of the un- 

 der surface is similar to gilse. The specimen is perfectly mature. 

 Length .26 inch ; 6.5 mm. 



A single specimen in the Cabinet of Dr. Leeonte from the Nuva 

 Scotia region. 



This species at first glance might be mistaken for (csselatum but the 

 latter has fifteen rather deeply impressed, closely and rather fiii.'lv 

 punctured striae. 



0. obliteratum, n. sp. 



This species also has but fourteen elytral stria), but with a close 

 resemblance to amerkanum. The thorax is longer and rather more 

 narrow in front. Head similar in color and sculpture. Thorax with 

 the entire surface, even to the margins coarsely and sparsely punctured, 

 less densely on the disc, median line feebly impressed ; pale margins 

 narrow and extending inwards by a rather broad bond, a short distance 

 along the apical margin. The elytral coloration is almost identical 

 with anicrit atium, but the punctures of the striiv; which extent! very 

 distinctly to near the apex in the latter species are almost entirely ob- 

 literated in this and the stria) are also much fainter. Under surface 



