■127 — 



D. — Vittal spots nearer the vitta, 

 diverging, almost connected. Hum- 

 eral line angulated. In these speci- 

 mens A, B, C & D the markings are 

 pure bronze. 



E. — Vittal spots joining subsut- 

 ural vitta, making the latter dent- 

 ate. Humeral lunule pipe shaped 

 Interior spots combined forming a 

 single heavy dot. Sutural and sub- 

 sutural vittas uniting near lower 

 margin of elytra. 



F. — Vittal spots free, vitta sut 

 ural. Markings greenish bronze. 



G. — .Sutural vitta strongly den- 

 tate. Lower vittal spot free. Mark- 

 ings green. Margins of prothora.x 

 light yellow. 



H. — Vitta broader and denta- 

 tions more obtuse. 



I. — Dentations still more obtuse. 

 All markings heavier. This is the 

 common form o'i scalaris , 



J. & K. — In these specimens the 

 series reverts somewhat to the p/ii7a- 

 delphica type. The sutural vitta 

 and humeral lunule are like scalaris 

 but the fine lateral spots and red- 

 dish bronze color of the markings xqc?\\ philadelphica. This series shows 

 a nearly complete gradual gradation from the finely maculate form of 

 philadelphica (H) to the strongly marked scalaris type (I). A still more 

 extended series will, I expect, completely demonstrate the truth of the 

 opinion here advanced. Should further investigation bear me out, the 

 wzxiiQ philadelphica \awi\. must stand for both insects, as it has decided 

 priority. Scalaris is however a well marked race, in some localities very 

 constant. Hundreds collected at Cambridge last summer show scarcely 

 any variation, while specimens from New Jersey, Cape Cod and prin- 

 cipally Canada are decidedly inconstant and variable. 



Figure L represents an insect which has long been considered a 

 variety of jfa/a/'/j. In many collections it bears Dr. Leconte's cabinet 

 name labyrinthica, but it has lately been determined by Dr. Horn as 

 identical with C. pnirsa Stal. Its elytral markings are certainly peculiar 



