84 GEO. H. HORN, M. D. 



Varieties : — 



Var. puncticollis, typical form. — " Dull yellowish brown ; thorax coufluently 

 punctured, unequal ; antennae and two tillets on each elytron black." 



" Body with minute hairs; head, above confluently punctured; clypeus and 

 labrum glabrous; anteniife black; thorax rough, with excavated confluent punc- 

 tures, immaculate, iuequal ; elytra with minute punctures, fillets obsolete, often 

 wanting or hardly visible; thighs with a black spot, tibiae and tarsi black." 



The above is Say's description reproduced to bring before the 

 student the evidence that the present species is really what Say had 

 before him. The vittate forms seem to be much less common than 

 the others. Tlie elytral vittee, two on each side, are placed — one 

 arising from-the side of the scutellum runs parallel with the suture 

 extending three-fourths to apex, the second begins at the umboue, 

 runs j)arallel with the side margin, curving inward at apex, but not 

 reaching the suture. These vittse may be more or less indistinct, or 

 the lateral one may alone remain. 



Specimens illustrative of this form have been examined from Col- 

 orado, Texas, Utah and Florida. 



Var. . — Beneath piceous, head and thorax pale, elytra black with the 



suture, side margin and apex pale. 



Specimens have been seen from California and the Atlantic coast. 



Var. . — Totally black, including legs and antennae. 



Specimens have occurred with the preceding variety. 



Var. . — Entirely dull yellow, the outer portion of the antennae and the 



tarsi brownish. 



This is the most abundant form, and is known from the Atlantic 

 coast from Massachusetts to Florida ; Colorado, Utah, New Mexico, 

 Texas and California. 



The legs vary in color with the body. As a general rule the pale 

 bodies have pale legs, those entirely black have black legs, while the 

 vittate, or the partially black forms, have the tibia? externally, the 

 tarsi and a space on the femora piceous. 



It is probable that some objection may be urged to my identifica- 

 tion of Say's species from the fact that he states its length as " three- 

 twentieths of an inch," while the species is never that small, and is 

 usually twice that size. It is probable that Say made a slip of the 

 pen in this case, as is well known in several other instances in his 

 works. 



With the above identification it is readily seen why Say saw a 

 resemblance to baccharidis, as he must doubtless have known Trir- 



