HOLOTROCHUS. 683 
1. Holotrochus rufopygus. (Tab. XVIII. fig. 5.) 
Subcylindricus, nitidissimus, niger; abdominis segmentis duobus ultimis rufis; antennis pedibusque piceis ; 
prothorace parce subtilissimeque punctulato, utrinque prope angulum posteriorem longius impresso ; elytris 
vage subtiliter punctatis. 
Long. 64 millim. 
Hab. Guatemata, Purula 4000 feet (Champion). 
Antenne rather short ; joints 4-6 each about as long as broad, 7-10 slightly trans- 
verse, the terminal joint obtuse and rather longer. Head very feebly and sparingly 
punctured. Thorax transversely subquadrate, straight at the sides, the hind angles a 
little rounded ; near each side is a rather large impression extending more than one third 
of its length. Elytra longer than the thorax, the shoulders sharply defined and a little 
prominent ; with a deep sutural stria and very obsolete punctuation. ‘Terminal ventral 
segments feebly punctulate, dull; an elongate deep depression on the middle of the 
last segment, and a slight impression with four minute tubercles on the penultimate 
one in the male. 
One pair. 
2. Holotrochus simplex. 
Nitidissimus, niger ; antennis pedibusque rufis; subtilissime punctulatus ; prothorace fere inimpresso. 
Long. 6 millim. 
Hab. GuateMata, Las Mercedes 2500 feet (Champion). 
In this species there is only a feeble impression, bearing three or four rather larger 
punctures, on each side of the thorax, and the terminal segments of the hind body 
are not red; in other respects the unique female greatly resembles the same sex of 
H. rufopyqus. 
3. Holotrochus picescens. 
Subcylindricus, nitidissimus, nigro-piceus ; antennis pedibusque rufis; subtilius punctatus; prothorace fere 
inimpresso. 
Long. vix 5 millim. 
Hab. GuateMaa, Rio Naranjo 450 feet (Champion). 
Closely allied to the two preceding species, but the thorax is without conspicuous 
depression, and the surface is a little less obsoletely though more closely punctate ; 
such depression as there is on the thorax is very vague and small, though replaced by a 
more conspicuous one at the extreme base of the wing-case. ‘The male has an elongate, 
deep, elliptical impression, with a slightly incrassate margin, on the middle of the last 
ventral plate. Unique. 
4. Holotrochus politus. 
Subcylindricus, nigro-piceus, nitidissimus; antennis pedibusque rufis; fere impunctatus; elytris prothoracis 
longitudine, 
Long. 42 millim. 
ene 4 S82 
