MESOMPHALIA.—CHELYMORPHA. 147 
outer part of the disc (in a line with the end of the humeral mark and sometimes extending to about one- 
third from the apex), black; antenne black, the five basal joints pale testaceous, 2-5 more or less stained 
with piceous above ; the under surface and legs pale testaceous, the tibice on their outer edge and the 
tarsi black. Head, antenne, prothorax, scutellum, and elytra as in M. nigrolineata, the prothorax with 
very minute scattered punctures at the sides, the apex as viewed from above truncate. 
Length, 3, 83-9, breadth 7 3-83 millim.; 2, length 93-103, breadth 8-82 millim. 
Hab. Costa Rica, Caché (Rogers). 
Three males and two females. Closely allied to, and probably only a variety of, 
M. nigrolineata, from which it differs in having the suture black for a short distance 
below the scutellum only (the black not quite reaching the base), the fine black streak 
on the outer part of the disc of each elytron abbreviated and interrupted, and the 
elytral margins not bordered with black. 
CHELYMORPHA. 
Chelymorpha (Chevrolat), Dej. Cat. 3rd edit. p. 393 (1837); Boheman, Monogr. Cassid. ii. p. 1 
(1854) (partim). 
Cyphomorpha, Hope, Col. Man. iii. p. 160 (1840). 
This genus is readily recognizable by the base of the prothorax being so deeply 
emarginate on either side externally as to make the hind angles, which are acute or 
sharp, appear as if they were produced behind, the prothorax being also emarginate to 
a greater or less extent in front. Amongst other characters given by Boheman are 
“the prosternum deeply, longitudinally canaliculate,” and “the claws unidentate at 
the base beneath.” ‘Three of his species, C. punctipennis, C. apiata, and C. obducta, 
all from §. America, do not possess these peculiarities, nor have they the prothorax 
emarginate in front; and I propose to separate them under the name Cistudinella, 
including in the same genus an allied species from the State of Panama, which is dealt 
with below. Upwards of one hundred species of Chelymorpha have been described, 
all American, ranging from the United States to Patagonia and occurring also in the 
Antilles ; twenty-four are here recorded from within our limits as against two from the 
United States. The genus is one of the most characteristic of the Central-American 
Cassidide ; C. yuvenca and its allies bear a remarkable resemblance to some of the 
species of Epilachna of the family Coccinellide inhabiting the same region. The 
following Table is added to assist in the identification of the Central-American species, 
but it must be remembered that some of them are very variable in colour. 
Elytra strongly gibbous anteriorly, the suture usually more or less raised below 
the base, so as to form a hump; upper surface thickly pubescent. 
_ Species large, very coarsely punctured above. . . . . . . . . . . Aépfneri, Boh. 
Species smaller, more finely punctured above. 
Elytra with several distinct spots, including a common sutural one. . . v pubescens, Boh., 
. . _[gressoria, Boh. 
Elytra immaculate or nearlyso . . . . . . . . . . . ).)  «Sericea, Boh. 
duel > wit iw DS NM G7 
Donn, Chempion oe G05 
bis Chewy: & Tee i 
