Explanation of Plates. 435 
EXPLANATION OF PLATES. 
PLATE XXIII. 
Miillerian group of Ithomiine, Lycoreane, Heliconine, and Lemon- 
iine butterflies, showing the darkest forms. The upper- and under- 
sides of every specimen is shown. 
All specimens are from the Potaro River, thirty miles above its 
confluence with the Essequibo, British Guiana. (Between the eighth 
and tenth mile from the Potaro, on the road to the gold mines.) 
All figures are about 3 of the natural size. 
Fie. ITHOMIINE. 
1. Mechanitis pannifera, ¢ : captured by C. B. Roberts, Aug. 28th, 
1903 : in Hope Dep. 
2. Mechanitis pannifera, 2 : captured by C. B. Roberts, about Aug 
—Oct. 1901 : in Coll. Kaye. 
3. Mechanitis polymnia, 2: captured by C, B. Roberts, March 14th, 
1905: in Coll. Kaye. 
4. Ceratinia philidas: captured by W. J. Kaye, May 17th, 1901: 
in Coll. Kaye. 
5. Melinxa egina : captured by C. B. Roberts, Aug. 28th, 1903: in 
Hope Dep. 
6. Melinxa crameri: captured by C. B. Roberts, no date : in Coll. 
Kaye. 
7. Melinxa mneme: captured by C. B. Roberts, Aug. 28th, 1903 : 
in Hope Dep. 
The same specimen is represented in Fig. 7, Pl. XXVI. 
LYCOREANA, 
8. Lycorea ceres: captured by C. B. Roberts, Nov.—Dec. 1901 : in 
Coll. Kaye. 
9. Lycorea pasinuntia: captured by C. B. Roberts, no date: in 
Coll. Kaye. 
HELICONINA. 
10. Heliconius silvana : captured by C. B. Roberts, March 5th, 1905: 
in Coll. Kaye. 
11. Heliconius vetustus: captured by C. B. Roberts, March 18th, 
| 1905 : in Coll. Kaye. 
TRANS. ENT. SOC. LOND. 1906.—PART II. (JAN. 1907) 29 
