AMERICAN COLEOPTERA. 105 



gradually narrowed in front, sides nearly straight, disc densely punctured, some- 

 what reticulate at the sides, a slight ante-scutellar fovea, hind angles obtuse, 

 lateral margin obsolete in front, thorax beneath densely and coarsely punctured, 

 presternum at tip suddenly narrowed. Elytra moderately convex, margin finely 

 serrulate posteriorly, the apices separately rounded, disc without trace of costa? 

 granulately punctured at base, more finely and densely posteriorly and with a tend- 

 ency of the punctures to form transverse strigoe. Body beneath sparsely punctured. 

 Posterior tarsi as in gentilis. Length .30 — .40 inch ; 7.5 — 10 mm. (PL IV, fig. 5). 



The last ventral segment is oval at tip in both sexes, a little more 

 obtuse in the female. 



In this species there are no traces whatever of fine costse on the 

 elytra. Its form is a little more convex than in gentilis. The elytra! 

 spots are usually six, two in front of middle on each side of the suture, 

 two posterior to these and more external and two smaller about one-fifth 

 from the apex and closer to the suture than the first pair. These are, 

 however, variable and may be entirely absent. 



Occurs in the Middle and Northern States, extending westward to 

 California and Nevada. 



]fl. gentilis Lee. — Color variable between green and blue or darker, metallic. 

 Head densely punctured. Thorax with feebly arcuate sides, gradually narrowed 

 to front, the lateral margin entire or very nearly so, disc densely and rather 

 coarsely punctured, a slight ante-scutellar fovea, under side densely cribrately 

 punctured, presternum at tip suddenly constricted. Elytra moderately convex, 

 densely granulate punctate, lateral margin at apex finely serrulate, the tip obtuse. 

 Body beneath moderately densely punctate. Posterior tarsi with first joint not 

 longer than the next two. Length .38 — .46 inch; 9.5 — 12 mm. 



The last ventral segment of the male is slightly truncate, of the 

 female rounded. 



This species is one of those which has never any elytral spots or 

 ot her ornamen tat ion . 



Occurs in Colorado, Arizona, and the entire Pacific region. 



M. iiltrusa n. sp.— Oblong, moderately convex, dark bronze, beneath more 

 shining, surface sparsely pubescent. Head convex, front densely punctured and 

 longitudinally strigose, clypeus narrowly semicircularly emarginate. Thorax nar- 

 rowed in front, sides feebly arcuate, margin obliterated in front, hind angles 

 distinct, subacute, flattened above and smooth, disc coarsely, densely and deeply 

 punctured, beneath coarsely and densely punctured, the presternum distinctly 

 reticulate, suddenly narrowed at tip. Elytra rather coarsely and densely granulate 

 punctate, the apical margin finely serrulate, the tips separately rounded. Body 

 beneath sparsely punctate, surface with a greenish or bluish metallic lustre. 

 Posterior tarsi as in gentilis. Length .26— .30 inch; 6.5 — 7.5 mm. 



The last ventral segment is slightly truncate in the male the margin 

 reflexed, in the female the segment is a little longer and more oval at tip. 



This species represents in the western regions eeneola of the east. 

 It is similar in form, sculpture and color, but the two differ in the form 



TRANS. AM Kit. K NT. SOC. X. (27) AUGUST, I SSL'. 



