MALACODERMATA. 343 
part, as are also the claws, the undersides of the tarsi, and the middle of the tibie. 
This species is near H. scabra, Lec. 
Two specimens. 
23 (a). Hydnocera cylindricollis. (Tab. XIII. fig. 16.) - 
Hydnocera bituberculata, ante, p. 176, pars. (Nec Chevr.) 
Nigra, subcerulescens, pilosa, fere glabra; prothorace longiore, lateribus sinuatis; elytris parce, obsolete 
punctatis, humeris alte carinatis, carina acuta, pone medium producta, scutello pube argentea dense vestito ; 
antennis testaceis, ad apicem fuscis. Long. 43-5 millim. 
Hab. Nicaraaua, Chontales (Janson) ; Panama, Bugaba, David, Volcan de Chiriqui 
below 4000 feet (Champion). 
This is the insect referred to under ZH. bituderculata as having the carina more 
produced, &c., and the localities repeated here are therefore to be removed from 
that species. The remark, “The shining pubescence is almost confined to a spot,” 
applies solely to H. bituberculata. In H. cylindricollis the thorax is longer and more 
shining, and not so much dilated laterally below the anterior constriction ; the elytra 
are not so coarsely punctured near the base, and the carina is sharply defined, whereas 
in H. bituberculata it is interfered with by the punctuation, and is frequently quite 
indistinct. In the present species the scutellum is clothed with bright silvery scales or 
hairs, but only distinct in fine specimens; the bright spot on the elytra is absent, but 
the apex is pruinose and with shining silvery hairs. 
About a dozen examples. 
23 (s). Hydnocera vitrina. (Tab. XIII. fig. 15.) 
Nigro-cerulea, grosse punctata, nitida; humeris longe carinatis; elytris macula laterali parum distincta, 
" apiceque albidis, margine laterali pone medium reflexo et crenulato. Long. 53 millim. 
Hab. Mexico, Tuxtla (Sallé); Panama, Bugaba, Volcan de Chiriqui (Champion). 
H. vitrina is so much like H. bituberculata and H. cylindricollis that it will suffice to 
point out in what respects it differs from those species. The general form is more 
nearly that of H. cryptocerina, but the upper surface is more shining and less roughly 
punctured than in that species. There are, however, numerous scattered large punctures 
~ all over the disc of the elytra, but becoming rarer near the apex. The thorax is not so 
long, and more widened at the sides than in H. cylindricollis, and is uneven and 
punctured, and has a central smooth space faintly raised. The elytra have numerous 
large deep punctures, which sometimes (in the specimens from the Volcan de Chiriqui 
alt. 4000 to 6000 feet) interfere with the carina, but usually leave it intact. In the 
typical example, viz. that from Bugaba, the apex of the elytra, their fold. below the 
middle, and a spot on the side are yellowish, as well as the legs on their inner sides ; 
but in the other specimens the legs are black, pale only at the extreme base, and in 
one the front legs are partly pale. These I think are only varieties. The example from 
