436 Explanation of Plates. 
Fia. 
12. Heliconius nwmata: captured by C. B. Roberts, April 2, 1905 : 
in Coll. Kaye. 
The same specimen is represented in Fig. 14, Pl. XXVI. 
13. Hueides nigrofulua g : captured by C. B. Roberts, Nov.—Dee. 
1902 : in Coll. Kaye. 
14. Hueides nigrofulva, 2 : captured by C. B. Roberts, March 25th, 
1905 : in Coll. Kaye. 
LEMONIINA. 
15. Stalachtis calliope : captured by C. B. Roberts, March 26th, 1905 : 
in Coll. Kaye. 
PLATES XXIV (UPPER-SIDES) AND XXV (UNDER-SIDES). 
Miillerian group of Ithomiine, Lycoreane, and Heliconine butter- 
flies, showing the extreme banded forms. 
The specimens represented are the same, and their figures occupy 
corresponding positions on both plates. 
All specimens are from the Potaro River, and all, except those 
represented in 10 and 14, from 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.) Specimens 
shown in Figs. 10 and 14 are from Tumatumari, fifteen miles lower 
down the Potaro river. 
All figures are 2 of the natural size. 
ITHOMIINE. 
1. Mechanitis pannifera, g : captured by C. B. Roberts, Sept. 1903: 
in Coll. Kaye. 
2. Mechanitis polymnia, ¢ : captured by C. B. Roberts, Nov.— 
Dec. 1901 : in Coll. Kaye. 
3. Mechanitis polymnia, 2 : captured by C. B. Roberts, Sept. 8rd, 
1903 : in Coll. Kaye. 
4, Cerutinia euclea form ninonia: captured by Percival, April 3rd, 
1904: in Coll. Kaye. 
5. Melinea crameri, ¢ : captured by C. B. Roberts, Aug. 28th, 
1903 : in Hope Dep. 
6. Melinea mneme, ¢ : captured by C. B. Roberts, August 28th, 
1903: in Hope Dep. 
The same specimen is represented in Fig. 2, Pl. XXVI. 
7. Melinea mnasius: captured by C. B. Roberts, March 17th, 1905: 
in Coll. Kaye. 
