AMERICAN COLEOPTERA. 23 



A. qiiadrivittata, Horn,— (PI. I, fig. 37.) Form cylindrical, convex, 

 surface faiutly bronzed, with sparsely placed short erect setre, elytra with 

 a marginal and median yellow stripe on each. Head densely and coarsely 

 punctured, front flat, vertex carinate. Thorax convex, unicolored, apex trun- 

 cate, sides gradually arcuate to base, margin very narrow, not visible from 

 above, inferior at base; disc with median line feebly impressed in front, a 

 faint impression at middle of base, one more distinct on each side; surface 

 moderately densely punctured, intervals shining. Elytra as wide as thorax, 

 sides feebly narrowing to apex and very finely serrulate, umbone feebly 

 prominent; disc convex with distinct and regular striae of moderately coarse 

 punctures, intervals flat, uniseriately punctulate. Body beneath bronzed, 

 sparsely pubescent. Presternum truncate. Abdomen finely alutaceous, moder- 

 ately densely punctate, last ventral without apical carina. Length .20 inch; 

 5 mm. 



I have seen numerous specimens of this species and find the mark- 

 inj^s of the elytra invariable. In size it varies a very little above and 

 below that given above. 



Specimens occur from Fort Mojave, California, and St. George, 

 Utah, Dr. Palmer. 



A. gemilia, n. sp.— (PI. I, fig. 37.) Form cylindrical, surface opaque. 

 Thorax with yellow spot at sides, sides moderately arcuate and narrower 

 at base than at middle, margin entirely obliterated except at basal third; 

 disc opaque convex, punctures variolate and very densely placed. Body be- 

 neath bronzed, subopaque, sj)arsely pubescent. Prosternum truncate, abdomen 

 coarsely and moderately densely i)unclured, last three segments decidedly 

 rugulose, last ventral in great part yellow and without trace of subapical 

 carina. Length .22 inch; 5.5 mm. 



In all other respects this species resembles the preceding, the elytra 

 being similarly vittate. The most striking character is found in the 

 form of the antennse. These become gradually broader from the third 

 joint instead of (as in the other species) having the fifth joint sud- 

 denly broader than the fourth. This character with the almost entire 

 obliteration of the thoracic margin, mark it as a peculiar species. 



One specimen in my cabinet from California, San Bernardino 

 Valley. Mr. Ulke has another also from California, without specjial 

 locality. 



AcM.^ODERiE LOBAT.E. 



The prosternum in front is furnished with a broad lobe, emarginate 

 at middle; the angles prominent, on each side of the lobe is a slight 

 notch beyond which the margin is straight to the angles. The humeral 

 angles of the elytra are prolonged and the sides of the elytra sc deeply 

 sinuate opposite the metasternum that the end of the coxal plate is 

 distinctly visible from above. 



One species constitutes this group. 



