THE OIL AND 1U 1STER BEETLES. 



1357 



2518 ( -). /OMTIS ,si U'icou.is sp. iniv. 



ISlongate-obldiig. Antenna-, occiput. tibia 1 , tarsi ;ind meso- jind meta- 

 sterna brown ; thorax, front of head, femora, prosternum and abdomen yel- 

 low ; elytra as mentioned in key. Head coarsely and rather closely punc- 

 tate, the middle of occiput snnother. Thorax slightly wider than long; 

 sides and all the angles strongly rounded; disk uneven, sparsely and coarse- 

 ly punctate and with a deep median impressed line. Elytra scabrous or 

 rugose without distinct punctures. Abdomen finely and densely punctate, 

 the apex of fifth ventral broadly and deeply concave. Length X mm. 



Lake County ; rare. July 21). Taken from blossoms of the yel- 

 low flowered thistle, Cuit-ux pitcha-i Torr. Very distinct from 

 bilineata in color, difference in sculpture of elytra and in having 

 thoracic impressed line. 



Z. longicoruis Horn, head nearly black, thorax darker at middle, 

 legs and antenna 3 pale, length 10 mm., was described from Central 

 Illinois. 



Tribe III. SITARINI. 



To this tribe belongs a single North American species, Hornia 

 mifiutipennis Riley, which is parasitic upon a, ground-bee (Antho- 

 pora sp.), which builds its nests in perpendicular clay banks. The 

 abdomen of the beetle is very large, as in Mcloc; elytra very small 

 and wings wanting. The head is triangular, thorax elongate, tarsal 

 claws cleft ; male with a double row of horny 

 plates on abdomen. It was described from 

 near St. Louis, doubtless occurs wherever its 

 host lives, and should be looked for in early 

 spring. 



Tribe IV. CANTI1ARIXI. 



Elongate, rather slender, subcylindrieal 

 beetles, having the front marked with a dis- 

 tinct transverse suture prolonged beyond the 

 insertion of the antenna 3 ; tarsal claws cleft to 

 base, the upper part not serrate, the two parts 

 in our genera snbe.iual. (Fig. 589.) Four of Fig. 589 



X 1J. (After Forbes.) 



the twelve genera are represented in the col- 

 lections, while members of two others perhaps occur. 



KEY TO INDIANA CKMOKA OF CANTHARIM. 



(i. Second joint of autenme at least one-half as long as third. 



V. MACUORASIS. 

 aa. Second joint of antenme much less than half the length of third. 



1). Next to last joint of tarsi hildbed. TKTKAONYX. 



?>b. Next to last joint cylindrical. 



