XANTHOPYGUS. 345 
X. viridipennis is readily distinguished from X. solskyi by the male characters, by 
the less dilated anterior tarsi, and the few but coarser punctures on the anterior part of 
the head. 
4, Xanthopygus flohri. 
Niger; elytris lete ceruleis, vel cyaneis, vel viridibus, antennis testaceis, palpis piceis, abdominis segmentis 
duobus ultimis totis rufo-testaceis, plantis anterioribus fuscis; capite fortiter punctato, medio levigato, 
clypei membrana pallida, discreta. 
Long. 12-18 millim. 
Hab. Mexico (Flohr), Mirador, Oaxaca (Hoge), Cordova, Tuxtla (Sailé) ; GuaTEMALA, 
Zapote (Champion). 
Closely allied to X. solskyt and X. viridipennis, but readily distinguished by the 
picescent palpi. The clypeal membrane is pallid and very definite though short. 
The male has on the middle of the under surface of the penultimate segment a trans- 
verse series of elongate concolorous set, and the hind margin of the following segment 
has a rather broad notch in the middle, about as deep as it is broad, and quite cleanly 
cut out, not at all membranous at the base, and differing in this way much from the 
emargination of this sex in X. solskyi. The front tarsi are only moderately broad. 
I have before me three or four dozen examples from various sources of this species ; 
it varies much in size and the smaller examples have the head and thorax less closely 
punctate, and the palpi not so darkly piceous; but the male characters are the same 
in all, and I cannot distinguish more than one species. From Guatemala only two 
examples have been received. In Sallé’s and other collections this insect was labelled 
X. sapphirinus, Er., and I have also seen it called X. calidus, Er. 
5. Xanthopygus puncticollis. (Tab. VIII. fig. 15.) 
Niger; capite thoraceque violaceis, elytris cyaneis vel viridibus, abdominis segmentis duobus ultimis, palpis 
antennisque testaceis, his extrorsum fuscescentibus ; capite parvo ; thorace fortiter punctato, linea angusta 
mediali impunctata. 
Long. 15 millim. 
_ Hab. Panama, Bugaba, Volcan de Chiriqui 2000 to 3000 feet (Champion). 
This is readily distinguished from the other Central-American species by the violet 
tint of the head and thorax; it is very closely allied to the Amazonian X. violaceus, 
but that species has the penultimate segment of the hind body in larger part black, 
while in X. puncticollis it is entirely yellow-red, the rufescent colour invading indeed 
the hind margin of the antepenultimate segment. 
The male has an elongate transverse series of sete on the middle of the lower plate 
of the penultimate segment of the hind body, and the terminal segment has a deep 
notch in the middle; these characters are the same as those of the corresponding sex 
of X. violaceus, except that the hind margin of the sixth segment is apparently quite 
BIOL. CENTR.-AMER., Coleopt., Vol. I. Pt. 2, Apri 1884. 2VYV 
