COLEOPTERA OF BAJA CALIFORNIA. 369 



Anterior angles not obliquely truncate; sides slightly arcuate; elytral 

 bands interrupted. 

 Surface somewhat dull. socialis. 



Surface shining. irisigjicUa. 



Elytra without darker fascif©. 



Body bright green; anterior angles of thorax not obliquely truncate. 



prasma. 

 Body bicolored above; anterior angles of thorax obliqiiely truncate. 



bicolor. 



From specimens examined by me socialis and trisignata 

 seem not to be distinct specifically. 



AcM^ODERA scAPULARis n. sp. Plate viii, fig. 6. 



Similar in form to JJavomargmata , but rather more at- 

 tenuate posteriorly, piceous black with faint bronze 

 tinge. Head coarsely closel}^ punctate, front sparsely 

 hairy and longitudinally impressed. Thorax more than 

 twice as wide as long, wider slightly behind the mid- 

 dle, sides obliquely arcuate in front, behind the middle 

 sHghtly sinuate, the hind angles rectangular, lateral 

 margin acute and slightly reflexed, concealed near the 

 hind angles, disc with a moderately deep triangular de- 

 pression at middle and a deep oblique impression each 

 side, surface coarsely and moderately closely punctate, 

 very sparsely hairy, a yellow spot near the angulation. 

 Elytra as wide as the thorax at base, gradually narrowed 

 with but slight arcuation to apex, the margin from middle 

 to apex serrate, disc slightly depressed, fifth interval finely 

 costiform nearly to apex, punctures coarse and close, 

 larger and closer exterior to the costa, the intervals smooth 

 with a single row of punctures each bearing a short hair, 

 the intervals near apex exterior to the costa muricate, sur- 

 face muculate with yellow — beginning behind the humeri 

 the marginal interval is 3^ellow nearly to apex with an in- 

 terruption opposite the last ventral suture, near the mid- 

 dle on each side the marginal line expands in an oblique 



