32 Mr. G. R. Waterhouse on Coleopterous Insects 



produced laterally into small acute processes j the ordinary inter- 

 stices of the striae of the elytra are very narrow and elevated ; the 

 punctures of the striae are large, transverse, and separated from 

 each other by narrow spaces. A few large punctures are seen on 

 the under surface of each of the thoracic segments ; the abdominal 

 segments are more thickly punctured ; the penultimate however 

 is nearly smooth, and the last is very delicately punctured. The 

 abdomen is depressed in the middle. 



Two specimens from James^ Island present the above charac- 

 ters ; some other specimens in the collection which cannot other- 

 wise be separated, display the thoracic fovea rather less distinctly, 

 and the double ridge on the disc is sometimes wanting. 



Ammophorus ohscurus. Amm. ater, obscurus ; antennis pedibusque 

 piceis ; capite thoraceque rugoso-punctatis ; angulis thoracis acutis 

 extrorsum productis ; elytris crenato-striatis, interstitiis angustis 

 elevatis. — Long. corp. 2|^lin. 



This species has the thorax narrower than in either of the pre- 

 ceding, from which it may moreover be distinguished by its dull 

 colour, the thorax being rugosely punctured : the sculpture of the 

 elytra is rather more decided, and the suture is not raised as in 

 the other species. In Amm. galapagoensis the suture is fully as 

 much raised as the ridged interspaces of the striae ; in Amm. bi- 

 foveatus the suture is also distinctly raised, but not quite so much 

 as the ridges between the striae ; in the present species the suture 

 is flat. Like Amm. bifoveatus, the angles of the thorax are pro- 

 duced, and as in both the preceding species ; the humeral angle of 

 the elytra is produced and acute. The ordinary interstices of the 

 elytra form very narrow and considerably elevated ridges, in the 

 grooves between which are large transverse impressions, and si- 

 milar impressions are observed on each side of the suture ; not 

 extending quite to the suture, they give that part the appearance 

 of being slightly raised, and indeed it is so on the hinder part 

 of the elytra. 



The three species of Ammophorus here described have the third 

 joint of the antennae shorter in proportion than in Amm. peru- 

 vianus, but they agree in this respect with Amm. costatus and 

 Amm. rubripes of Sober, with which they also agree in size ; they 

 all have the interstices of all the striae of the elytra elevated, 

 whilst in one only of the Chilian species [A. costatus) are any of 

 these interstices distinctly ridged, and here it is only the alter- 

 nate spaces between the striae which present that condition. 



Family PEDiNiDiE. 

 Pedonoeces^, no v. gen. 

 Clypeus distinctly emarginated. 

 Labrum small, transverse. 



* From -TTihou, the ground, and uiKia, to inhabit. 



