from the Galapagos Islands. 31 
que rufo-piceis, vel piceis; capite thoraceque crebre punctatis, 
punctis oblongis, prope latera plerumque confluentibus, interstitiis 
angustissimis longitudinaliter parum elevatis ; thorace angulis an- 
ticis acutis, posticis subacutis ; elytris sulcatis, sulcis catenato- 
punctatis, interstitiis costatis; corpore subtus profunde punctato. 
—Long. corp. 24—23 lin. 
This species is smaller and proportionately rather shorter than 
the Amm. peruvianus. The head is thickly covered with narrow 
oblong punctures which run into each other, so as to leave very 
narrow, regularly longitudinal ridges. The thorax is moderately 
conyex above, rather broader than long, moderately rounded at the 
sides, and but slightly sinuated near the posterior angles, which 
are nearly right angles, but slightly acute; the anterior angles 
are prominent, project forwards, and are somewhat acute. The 
elytra are rather broader than the thorax and of an oblong form, 
rounded at the apex, and moderately convex ; the humeral angles 
are produced laterally into an acute angle (more prominent and 
distinct than in Amm. peruvianus) ; each elytron presents eight 
sulci, in each of which are a series of impressions or largeish 
shallow punctures ; the interstices form narrow ridges, on which 
a few very minute punctures are scattered. The mentum is ru- 
gose and has two oblong depressions ; the thoracic segments pre- 
sent a few large, irregular punctures beneath ; the abdominal 
segments are very coarsely punctured, if we except the last two; 
the penultimate has a transverse groove, and like the terminal 
segment is rather finely punctured. The palpi are red ; the legs 
and antenne pitchy-red, and sometimes pitchy. 
. Found by Mr. Darwin under stones upon a hill in Chatham 
Island. 
Ammophorus bifoveatus. Amm. ater, nitidus ; antennis pedibusque 
piceo-nigris ; capite punctato ; thorace angulis anticis acuminatis, 
posticis acutis, extrorsum productis, supra punctulato, foveis duabus 
et rugis tenuibus impressis ; elytris crenato-striatis, interstitiis an- 
gustis elevatis.—Long. corp. 3 lin. 
The Amm. bifoveatus is so named from its having two largeish 
but shallow depressions, situated, one on each side, about the 
middle of each lateral half of the thorax : the thorax is moderately 
convex, broader than long, broadest im the middie, and about 
equally contracted before and behind; the sides are contracted 
rather suddenly near the angles, which are prominent; the 
hinder angles, which are most promiment, are acute : the surface 
of the thorax is rather finely punctured, and presents numerous 
little longitudinal rug, which are most distinct on the sides, 
hinder part, and in the foveze described ; two grooves, move distinct 
and longer than the rest, are observed on the middle of the thorax, 
where they are separated by a narrow ridge. The elytra are 
broader than the thorax, oblong, and have the humeral angles 
