from the Galapagos Islands. 31 



que rufo-plceis, 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. 2 J — 2-J lin. 



This species is smaller and proportionately rather shorter than 

 the Amm. peruvianus. The head is thickly covered with nan-ow 

 oblong punctures which run into each other, so as to leave very 

 narrow, irregularly longitudinal ridges. The thorax is moderately 

 convex 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 antennse 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-nigiis ; capite punctato ; thorace angulis anticis acuminatis, 

 posticis acutis, extrorsum productis, supra punctulatojoveis 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 in the middle, 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 prominent, are acute : the surface 

 of the thorax is rather finely punctured, and presents numerous 

 little longitudinal rugse, which are most distinct on the sides, 

 hinder part, and in the fovese described ; two grooves, more 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 



