106 HEMIPTERA-HOMOPTERA. 
There is a large series of this species in our collection; they vary considerably in 
size, width between tips of the horns, length and concavity of the metoptdium, &c., 
but I can see no reason for separating them. Besides the names above mentioned as 
synonymous, I believe that C. cavicornis, Stal, C. fastidiosa, Fairm., and perhaps 
C. alta, Walk., belong to the same species, if the specimens in the British Museum 
are correctly named ; these insects, however, have not hitherto been recorded from 
Central America. The specimens above referred to as from Temax, Yucatan, are 
intermediate between C. alta and the form C. patruelis; C. alta, moreover, which is 
described by Walker with no locality, appears to be closely allied to the North- 
American C. taurina and C. constans, Walk. I have Signoret’s types before me, on 
which Fairmaire described C. testacea, and they vary considerably in the points above 
mentioned. 
8. Ceresa vacca, sp.n. (Tab. VII. figg. 14, 14a.) 
Brunnea, indistincte nigro-maculata; pronoto parum nitido, fortiter dense subrugosius punctato, a latere viso 
dorso elevato et rotundato, utrinque, sed magis antice, abrupte declivi, processu apicali fere recto, acuto ; 
fronte maxime excavaté ; metopidio linea media testaced a capife usque ad apicem pronoti continuata ; 
cornibus magnis, robustis, porrectis, recurvatis; tegminibus subrugosis, hyalinis, testaceo- vel flavo- 
maculatis ; pedibus fusco-testaceis. 
Of a brown colour, indistinctly marked with black; the pronotum comparatively dull, thickly, strongly, and 
in part rugosely punctured (if viewed from the side narrow, but with the highest part strongly elevated 
and rounded, and abruptly sloping on both sides, but especially in front), the apical process almost 
straight ; forehead very strongly excavate; metopidium with a very narrow testaceous raised line which 
extends to the apex of the pronotum; horns very large, robust, porrect if viewed from the front, strongly 
recurved ; tegmina with yellowish opaque spots on some of the areas ; legs fusco-testaceous. 
Long. cum tegm. 11, cum tegm. et corn. 12 millim.; lat. int. corn. 7 millim. 
Hab. Mexico, Omilteme in Guerrero 8000 feet (H. H. Smith). 
One female specimen. This species appears to be very distinct; there is, however, 
one specimen in our collection, and another in the Stockholm Museum, which in some 
points resemble it as regards the horns, but they may be abnormal forms of C. testacea, 
although they might with reason be described as a separate species. Apart from the 
horns, however, the general shape of the pronotum in C. vacca, if viewed from the side, 
is different from that of any other Ceresa that I have come across. ‘There is an 
ordinary female specimen of C. testacea in the collection from the same locality. 
9. Ceresa concinna, sp.n. (Tab. VII. figg. 15, 15 a.) 
Viridescenti-testacea, capite metopidioque supra caput flavis, cornibus pronoti, carind dorsali et linea mediali 
metopidii lete rufis; corpore toto supra punctis quibusdam dilutioribus asperso; pronoto distincte punc- 
tato, impressione laterali semicirculari conspicud; cornibus robustis, haud acutis vel recurvis; abdomine 
pedibusque dilute testaceis. 
Of a greenish-testaceous colour, with the head and parts just above it orange-yellow, and with the horns of the 
pronotum, dorsal carina, and a central line continued from the apex of the dorsal line towards the head 
red, the whole being flecked with small light testaceous spots; pronotum distinctly punctured, with the 
