AGEILTJS. 85 



coarsely punctured striolas. The thorax is marked with closely placed, strongly punc- 

 tured, wavy impressed lines ; the posterior ridge is not very well marked, short, rather 

 straight, directed forwards, and does not join the lateral margin anteriorly. The elytra 

 are reticulate-asperate ; the subcosta is distinct but it does not extend to the base or 

 apex, the sutural area being convex at the base and apex ; each elytron has a not very 

 distinct spot of silvery-grey pubescence at some distance from the apex (close to the 

 suture), and at the middle a still less distinct spot. The prosternum is finely rugose, 

 sparsely covered with silvery pubescence in the male, almost without pubescence in the 

 female. The metasternum and abdomen are distinctly and not very closely punctured, 

 almost without pubescence. 



Specimens from Duerlas in Guatemala, which appear to be referable to this species, 

 vary from 2^- to 2 J lines in length. 



53. Agrilus affinis. 



Olivaceo-seneus, parum nitidus ; thorace undatim striolato et punctato ; elytris crebre asperatis, pube brevi 

 pallida vestitis, macula communi pone medium calva ; abdominis segmentis secundo et tertio macula parva 

 alba ornatis. 



Long. 2l-2| lin. 



Hah. Guatemala, Duefias {Champion). 



This species is very close to A. errans, and it is only after very careful examination 

 that I venture to separate it ; both species were in some cases mounted on the same 

 card. It differs in having the elytra sparsely clothed with very short pale pubescence, 

 leaving an elongate bare spot just behind the middle, common to both elytra ; above 

 this spot and below it the pubescence is more dense, and indistinct spots are formed 

 representing those in A. errans. The abdomen has a small whitish pubescent spot at 

 the side of the second and third segments, which is not present in A. errans. The 

 character, however, which is the most important is the posterior ridge of the thorax, 

 which is well marked (though fine) and directed obliquely inwards, instead of being 

 directed forwards as in A. errans. 



54. Agrilus pectoralis. 



iEneo-cupreus, sat nitidus ; capite antice levissime convexo, subtiliter rugoso, pallide griseo-pubescente ; 

 thorace oblique striolato, disco obsolete canaliculate ; elytris reticulato-striolatis, maculis sex pallidis 

 ornatis ; metasterno lateribus albo-pubescentibus ; abdominis segmento basali supra macula laterali alba 

 notato. 



Long. l§-2 lin. 



Hab. Mexico, Northern Sonora (Morrison). 



The head is very gently convex in front and very finely and closely rugose, clothed 

 with silvery-white pubescence, which radiates from a spot situated above the middle ; 

 the top is convex, longitudinally striolate, the striolae punctured, and has a very 

 lightly marked median impressed line. The thorax is convex anteriorly, flatter 



