On Butterflies from Northern Nigeria. 57 
Mexico representative of R. Last’, to which R. magna is not 
nearly related. The following measurements in mw are from 
the new lot of R. Cockerelle :— 
Middle leg: femur+ trochanter 174; tibia 129; tarsus 63. 
Antenne: (1) 30, (2) 30, (3) 18, (4) 33, (5) 21, (6) 27, 
(7) 63. 6-jointed phase: (1) ?, (2) 380, (8) 42, (4) 21, 
(5) 28, (6) 66. 
I take this opportunity to describe the following species of 
the allied genus Phenacoccus :— : 
Phenacoccus Wilmatic, sp. n. 
?.—Brownish olivaceous; without lateral tassels; no 
ovisac observed; surface sparsely mealy; length when 
mounted 23 millim.; body pinkish after boiling in potash ; 
legs and antenne pale brown; legs very sparsely hairy; 
middle leg with femur-+ trochanter 213 w (width of femur 87), 
tibia 150, tarsus 89; claw with a small denticle on inner side 
near tip; hind tibia 180 long, 42 broad; hind tarsus 75 long,. 
21 broad ; body not hairy; bristles of anal ring about 90 uw 
long ; caudal lobes not at all produced; rostral loop short, 
not nearly reaching to middle legs; second joint of antenns 
conspicuously broader than third, and always longer. 
Antenne: 9-jointed phase, formula 29315 (467 8); 
segments, (1) 39, (2) 54, (8) 45, (4) 30, (5) 36, (6) 30, 
(7) 380, (8) 30, (9) 48. 8-jointed phase: formula 8 2 (1 3) 
(5 7) (4 6); segments, (1) 42, (2) 54-60, (3) 42, (4) 27, 
(5) 80-33, (6) 27, (7) 30-33, (8) 81-87. 
Hab. Beulah, N. M., 8000 feet, on Viola aff. pedatifida, 
May 11 (Wilmatte P. Cockerell). 
Allied to P. americane. Tasily known by the remarkably 
thick hind tibia, which is much broader than its tarsus. The 
four other legs are quite ordinary. 
XI1.—On a Collection of Butterflies made by George Migeod, 
Esq., in Northern Nigeria between September 1899 and 
January 1900. By ArtHur G. Buruer, Ph.D. 
THE collection of which this is an account is chiefly inter- 
esting owing to the strong North-eastern character of the 
species, tending to contirm the evidence in favour of a complete 
connexion between Western and Hastern types above the 
Equator. It was obtained at Yelva Lake, Borgu. 
