334 NY Fa OF O. Waterhouse on 
part between the coxze moderately broad and nearly flat. 
Abdominal process between the cox moderately broad, 
truncate in front. The rest as in Chitoniscus. 
The structure of the sterna in this genus most nearly 
approaches that of Helops striatus, but the mesosternum 
is shelving in front and not concave. The apical joint of 
the maxillary palpi is not securiform, &e. 
Parahelops pubescens, sp. nov. 
Klongatus, piceo-niger, nitidus, parce breviter griseo- 
pubescens. Capite crebre distincte punctato ; oculis pro- 
minentibus. Thorace [pler umque | convexiusculo, sat 
crebre distincte punctato, capite paulo latiori, latitudine 
haud longiori, antice posticeque paulo angustatis, lateribus 
leviter arcuatis, ante angulis (anticis posticisque ) leviter 
incisis. Scutello triangulari, brevi. Elytris basi thorace 
paululo latioribus, medio paulo ampliatis, convexis, sat 
fortiter striato-punctatis ; interstitiis haud convexis, sub- 
seriatim subtiliter punctulatis. Corpore subtus ecrebre 
distincte punctato. 
Long. 33 lin.; lat. 14 lin. 
This species varies in a most remarkable manner both 
in sculpture and form. The thorax is thickly puncutes 
sometimes moderately strongly, sometimes very delicately 
it is sometimes broadest in front, gradually awe 
behind, the sides being nearly straight ; sometimes the 
sides are much rounded, and the thorax. 4 is SO narrow in 
front that only the neck of the head can be withdrawn, 
whereas in other examples the head and eyes can be with- 
drawn into the thorax; the posterior angles are at times 
slightly acute, sometimes obliquely truncate. The elytra 
vary in length, sometimes bluntly rounded at the apex, at 
others somewhat attenuated; the striz are sometimes im- 
pressed and strongly punctured, at others not impressed 
and delicately punctured. These differences are certainly 
not specific, as the two sides of the same specimen are not 
always quite alike. 
Hab.—Tierra del Fuego. Brit. Mus. 
Parahelops Darwinii, sp. nov. 
Nigro-piceus, nitidus, sat latus, depressiusculus. Capite 
crebre fortiter punctato; oculis prominentibus; antennis 
piceis. Thorace capite duplo latiori, longitudine } latiori, 
convexiusculo, crebre fortiter punctato, antice omnino ro- 
