ANCHASTUS. — ANCHASTOMOBPHITS. 399 



16. AnchastllS tenuistriatllS. (Tab. XVIII. figg. 1, 1 a, antenna.) 



Oblong-oval, rather broad, convex, shining, thickly pubescent ; pitchy-brown, the head in front, and the 

 prothorax with the anterior margin and the base obscure testaceous, the elytra with the base on either 

 side of the scutellum and the dilated anterior portion of the epipleurae testaceous ; the antennae brown, 

 the legs testaceous. Head closely and rugulosely punctured, convex, sharply margined in front ; antennae 

 slender, extending considerably beyond the base of the elytra, joints 2 and 3 short, equal, the two 

 together scarcely so long as 4. Prothorax broader than long, almost parallel behind, the sides rounded 

 and converging from the basal third forwards ; the hind angles acute, narrow, greatly produced, bicari- 

 nate, the inner carina short and oblique, the outer one long and near the margin ; the surface thickly 

 and shallowly punctured, more sparsely so on the middle of the disc behind. Elytra moderately long, 

 slightly widening to about one-fourth from the base and then arcuately narrowing to the apex, the apices 

 conjointly rounded ; very finely and distinctly striate, the striae towards the sides and apex only with fine 

 punctures, the interstices convex and finely, sparsely punctate. Beneath rather sparsely punctured ; pro- 

 sternal sutures deeply channelled to near the middle ; posterior coxal plates exceedingly broadly dilated 

 inwards, and becoming very narrow outwards. 



Length 5|, breadth 2 millim. 



Hab. Mexico, Oaxaca (H'oge). 



One specimen, probably a female. This peculiar species differs in many respects from 

 all others of the genus here described. It has the thorax short, with the hind angles 

 bicarinate ; the antennae slender, with the third joint very short ; the elytra with very 

 fine, sharply defined striae, which are punctured towards the base and sides only ; the 

 posterior coxal plates exceedingly broadly dilated inwards (almost as wide as in 

 Physorhinus) ; the prosternal sutures channelled to near the middle. The insect is 

 unknown to Dr. Candeze. 



ANCHASTOMORPH US. 



Prosternum moderately wide, subparallel ; prosternal sutures double, widely separated for the greater part of 

 their length, obliquely and rather abruptly converging behind, and with a deep channel between them ; 

 posterior coxal plates broadly quadrangularly dilated inwards ; head deeply sunk into the prothorax, 

 declivous, convex, arcuately margined in front, the front separated from the anterior margin ; third 

 tarsal joint with a long, narrow lobe beneath, the fourth joint very small ; the other characters as in 

 Anchastus. 



This genus is proposed for numerous small Tropical- American species included in 

 Anchastus by Dr. Candeze ; A. hilaris, A. phedrus, and A. suturalis, Cand., may be 

 taken as the types. It includes also A. trisignatus, A. apicalis, and A. niger, Steinh. ; 

 A. grouvellei and A. longipennis, Fleut. ; and, probably, A. ornatus, A. seminalis, 

 A. pygmceus, A. posticus, and A. fasciatus, Cand. In the species enumerated below 

 the thorax has a long supra-marginal carina only, and the third joint of the antennae is 

 a little longer than the second ; these characters, however, are to be found in some of 

 the true Anchastus. The prosternal sutures are formed as in the genus Physorhinus. 

 Our four species may be separated thus : — 



Rufo-testaceous, the elytra with a triangular scutellar patch (in some specimens 

 extending to the humeri) and a median fascia, these markings connected 

 at the suture, and sometimes an ante-apical mark, black phedrus. 



