26 Memoirs on the Coleoptera 



different form, fully as wide as long, the well reflexed sides obtusely 

 angulate at the middle, thence oblique and nearly straight anteriorly 

 to the rounded and subprominent apical angles, and posteriorly for a 

 shorter distance to the rather abruptly formed sinus, at base becom- 

 ing parallel for some distance before the angles, which are slightly 

 more than right though very sharply defined; impressions similar, 

 the anterior deep, the posterior feeble, the stria distinct; elytra 

 two-thirds longer than wide and fully three-fourths wider than the 

 prothorax, the long oblique sinus very feeble; striae fine, not coarse 

 at tip; intervals flat; anterior puncture at or near basal two-fifths; 

 met-episterna distinctly elongate, fully one-half longer than wide; 

 tarsi nearly similar. Length (9 ) 9.2 mm.; width 3.5 mm. Mexico 

 (Tres Marias, Morelos), — Wickham *infidus n. sp. 



Despite a few inconsistencies, such as the tarsal sculpture, 

 swollen tempora and four dorsal punctures of districtus, the three 

 punctures, broader tarsi and posteriorly inflated elytra of logicus, 

 the shorter head and smaller eyes of haroni and the narrower head 

 and differently placed dorsal punctures of morelosensis and infidus; 

 these five species and probably some others already described, un- 

 doubtedly form a rather homogeneous group, especially in the 

 general habitus of the body, and I cannot avoid the conviction 

 that they have but little close affiliation with typical forms of the 

 Batesian Colpodes. 



Group II (curtipennis) 

 Subgenus Plantyus nov. 



In this apparently very restricted subgenus the body is notably 

 abbreviated, moderately convex, with the outer joints of the 

 rather thick antennae moderately compressed and with a fine 

 longitudinal groove above and beneath, the triangular mentum 

 tooth short and broad, the prothorax equally and feebly reflexed 

 at the sides, the sinuate basal line and sides of the elytra forming 

 an obtuse blunt angle at the humeri, and the met-episterna are 

 very short, not quite as long as wide. The elytral apices and 

 general structure otherwise are almost as in normal Anchomenus. 

 The tarsi are smooth above and the fourth joint is simply sinuate 

 at tip and bilaterally symmetric, without trace of the bilobation of 

 the Batesian Colpodes. The type may be defined as follows: 



Form short and stout, deep black throughout the body, legs and an- 

 tennae, the palpi black, with feebly diaphanous tip; surface shining, 

 the elytra opaque; head but little longer than wide, three-fourths as 



