HYDRANA. 93 
HYDRANA. 
Hydrena, Kugelann, Schneid. Mag. v. p. 578; Kiesenwetter, Linn. Ent. iv. p. 156. 
This is a very distinct genus of about thirty species of minute beetles. Those 
described are chiefly from the Mediterranean region; but three are known from North 
America, and one from Australia. The species are of very retiring habits; and although 
none are known from South America, Mr. Champion’s discovery of several species from 
Guatemala renders it probable that the genus will be found to be represented in South 
America when the brooks and smaller watercourses of the mountainous regions there 
are investigated. 
1. Hydrena longicollis. (Tab. III. fig. 5.) 
Nigra; antennis, palpis, pedibus prothoraceque ad angulos anteriores testaceis, elytris fusco-testaceis; pro- 
thorace subquadrato lateribus tantum leviter curvatis, equaliter crebre sat fortiter punctato, nitido ; 
elytris nitidis, haud fortiter seriatim punctatis. 
Long. 3, lat. 3 lin. 
Hab. GuateMata, San Gerdénimo, Duefias, Paso Antonio 400 feet (Champion) ; 
NicaraGua, Chontales (Janson). 
A small unattractive insect of feeble structure. Palpi very elongate and slender. 
Head black, the vertex closely and rather coarsely punctured. Prothorax nearly as 
long as broad, slightly curved at the sides, of a shining black colour, with a yellow spot 
at each front angle, and the front margin, as well as the sides, more or less yellowish. 
Elytra with numerous rather irregular rows of punctures; these are not large, and the 
interstices are shining. Beneath the prosternum is greatly shorter than the sides of | 
the thorax, and is finely carinate all along the middle; metasternum depressed in the 
middle, but without lines or elevations. In this species the great abbreviation of the 
prosternum in comparison with the free sides of the prothorax is remarkable. 
The small series of individuals before me show a good deal of variation ; the yellow 
colour at the angles of the thorax sometimes extends all across, and the margins may 
be broadly yellow, leaving a quadrate mark of dark colour on the middle: the punc- 
tuation of the thorax and even its length appear to varya little; but I find no evidence 
of specific distinction among the specimens. 
2. Hydrena puncticollis. 
Nigra, supra testacea, prothorace disco fusco, capite nigro; antennis, palpis pedibusque testaceis ; prothorace 
subquadrato, lateribus tantum leviter curvatis, crebrius fortiter punctato; elytris nitidis, sat fortiter 
seriatim punctatis. 
Long. 2, lat. 2 lin. 
Hab. Guatemata, Paso Autonio, 400 feet (Champion). 
This species is very closely allied to H. longicollis, but the punctuation of the pro- 
thorax is so much coarser and closer that I cannot unite the two; the colour of the 
