PAEADOMOEPHTTS. — AGEILTTS. 57 



face. The thorax has in the middle two shallow impressions, which in some lights 

 appear united ; the punctures are generally separated from each other vertically, but 

 are frequently united transversely or obliquely ; the posterior ridge is well marked, 

 shining, turned down to the margin in front beyond the middle, and then running 

 parallel to the margin to the front angle. The elytra are evenly and rather coarsely 

 asperate ; the subcosta is only slightly marked. The prosternal chin-piece is very 

 slightly emarginate. The prosternum is closely and coarsely punctured, longitudinally 

 impressed in the middle ; the intercoxal process is curved down at the apex, and obliquely 

 narrowed. The episterna are rather closely and moderately strongly punctured, with 

 a little pubescence on the outer edge. The abdomen has a transverse impression at a 

 short distance from the side of the basal segment, indicating the division between the 

 true first and second segments ; the lateral carina is very slightly angular just behind 

 the middle of the basal segment. 



A specimen just received from Panzos, Vera Paz (Conradt), differs from the one from 

 which I have taken the above description in being rather narrower, more brassy in 

 colour, and in having the thorax slightly rugulose. I am unable to say whether these 

 differences are sexual or specific. 



AGRILUS. 



Agrilus, Stephens, Illustr. Brit. Ent., Mandib. iii. p. 239 (1830). 



The members of this genus are very numerous, and are represented in all quarters 

 of the globe ; no less than 406 species are enumerated in Gemminger and Harold's 

 Catalogue (1869), and many have been since described. The number here recorded 

 from Central America is 141, and of these 52 are described from single specimens only. 

 Besides these there are several obscure species which I have not ventured to characterize 

 from unique examples. 



As is commonly the case in large genera, a linear arrangement of the species is 

 difficult and I have been unable to find characters by which Agrilus can satisfactorily 

 be divided into sections. 



The antennae vary somewhat in length in the different species, but not in any very 

 marked degree. They are, however, very long in A. manatus, A. femoralis, A. anten- 

 natus, and A. sohrinus ; and in A. planatus and its allies they are long and broad. 



The head, when viewed from above, has its anterior outline sometimes arched, as in 

 A. vittulus (Tab. IV. fig. 18 a) ; emarginate, as in A. divaricatus (Tab. IV. fig. 16 a) ; or 

 incised, as in A. exustus (Tab. IV. fig. 13a), &c. A. gracilipes and its allies have the 

 head flattened and vertical in front ; but every gradation between this and the inclined 

 head of A. furcillatus may be met with. The males frequently have the front of the 

 head of a brighter colour than in the females, and the sculpture is often finer. 



The thorax has in the larger number of species a more or less clearly-defined ridge 

 near the posterior angles ("posterior ridge"); and I have divided the genus into two 



biol. centr.-amee., Coleopt., Vol. III. Pt. 1, February 1889. I 



