THE OIL AND BLISTER BEETLES. 1357 



2518 ( ). ZoNiTis srLcicoLLis sp. nov. 



Eloiigute-iiblons. Auteuna', oceipul, tibia.', tarsi and meso- and uietii- 

 stenia bruwu ; thorax, front of bead, ffiuora, prosleruum and abdomen yel- 

 low, elytra as mentioned in l<cy. Head coarsely and rather closely luiiic- 

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

 sides and all the angles strongl.\- 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. I.,ength S mm. 



Lake County; rare. July 29. Taken from blossoms of the yel- 

 low flowered thistle, Cnicus pitchvri Torr. Very distinct from 

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

 thoracic impressed line. 



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

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

 Illinois. 



Tribe III. SITARINI. 



To this tribe belongs a single North American species, Hornia 

 minuti'peiMm Riley, which is parasitic upon a ground-bee (Anflio- 

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

 abdomen of the beetle is very large, as in Meloc : elytra very small 

 and Avings 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 lY. CAXTIIAltlXI. 



Elongate, rather slender, subeylindrical 

 beetles, having the front marked with a dis- 

 tinct transverse suture prolonged beyond the 

 insertion of the antennse; tarsal claws cleft to 

 base, the upper part not serrate, the two parts 

 in our genera subequal. (Fig. 580.) Four of ^'s-sm.^^^ CaMans^MS^y. 

 the twelve genera are represented in the col- 

 lections, while members of two others perhaps occur. 



KEY TO INIilAXA (iE^ER.A. OF CA^JTHARIKI. 



a. Second .ioiut of .nntennie at least one-half as long as third. 



\'. Macrobasis. 

 aa. Second .i"int of antennre much less than half the length of third. 



h. Next to last .ioint of tarsi bilobed. Tetraonyx. 



1)1}. Next to last joint cylindrical. 



