1876.] 5 [Austin. 



shaped areas, in the centre of each of which is a minute raised spot 

 or tubercle, giving a peculiar appearance to the insect; while in the 

 spurious Sunii there is no trace of this sculpture, the upper surface 

 being simply punctate. This group, which should no doubt consti- 

 tute a distinct genus, is represented in the United States by only the 

 single species . . . . . . .1. monstrosus Lee. 



The genuine Sunii may be separated as follows: 



Head black 1 . 



Head pale 4. 



1. Thorax and abdomen dark; elytra black, scarcely wider than the 



thorax, with the suture and apex more or less pale ; form nar- 

 row, slender ...... 2. linearis Er. 



Thorax and abdomen dark; elytra pale, broader than the tho- 

 rax; form broad 3. californicus sp. n. 



Thorax and three or four segments of abdomen pale . .2. 



2. Large species 0.18 in. Elytra varying from almost entirely 



black to pale, with only a dusky cloud . 4. prolixus Er. 

 Smaller species .11 to .15 in 3. 



3. Elytra longer than the thorax, with a marginal black spot on 



each, which sometimes increases so as to nearly cover 

 it ........ 5. binotalus Say. 



Elytra not longer than the thorax, pale, or sometimes with a 

 trace of a black spot .... 6. brevipennis sp. n. 



4. Antennae slender, as long as the head and thorax, last joint but 



little thickened ; elytra pale, one and one-half times longer 



than the thorax 7. longiusculus Mann. 



Antennae slender, but shorter than the head and thorax; elytra 

 longer than the thorax, each with a dark spot 



8. centralis Zimm. 

 Antennae stouter, thickened externally, joints_8-10 transverse 



9. similis sp. n. 

 10. tr (signal us Boh. 



1. Sunius monstrosus Lee. New Sp., Am. Col., 48. La. and 

 Fla. 



2. Sunius linearis Er. Staph., 639. 



Among the specimens which I have put under this species there is 

 considerable difference in the form of the elytra, which in some speci- 

 mens are linear, in others considerably inflated behind the humeri, so 

 as to be almost oval in outline, but I am unwilling to separate them 



