ACANTHOCERTTS. 127 



his remarks on the South-Brazilian A sesquistriatus (Col. Hefte, xii. p. 35) says that 

 Erichson's type specimen of A. humeralis has a short submarginal elytral stria like 

 A. sesquistriatus, i. e. a sharply incised stria. If this is really the case, the reference 

 of the present species to A. humeralis is wrong. But I suspect Von Harold's is a 

 mistaken observation. No mention is made of the short stria in Erichson's description, 

 which otherwise (with the exception of the punctured apex of the scutellum) agrees 

 with specimens taken by myself in the country from which his examples were derived. 



3. Acanthocerus relucens. (Tab. vii. fig. 24.) 



A. seriato (Erichs.) affinissimus ; differt vertice et scutello lsevibus elytrorumque interstitiis apicalibus alternis 

 haud alte carinatis; saturate seneus, politissimus ; clypeo antice subtiliter postice in fasciam sat grosse 

 punctate ; thorace laevi, margine basali utrinque prope scutellum depresso ; scutello laevi ; elytris disco 

 sfcriato-punctatis, striis antice et postice abbreviatis punctisque ovalibus parum impressis, apice striis 

 profundis, suturali marginalique et sex brevibus interrnediis quarum interstitiis alternis mediocriter 

 elevatis ; tibiis posticis extus punctis arcuatis separatis insculptis. 



Long. 5| millim. 



Hab. Guatemala, Las Mercedes, Cerro Zunil, San Geronimo (Champion); Nicaeagua, 

 Chontales (Belt) ; Panama, Volcan de Chiriqui (Champion). 



Var. A. mexicanus. Paullo minor (4|-5 millim.), elytrorum sulcis apicalibus vage crenato-punctatis, scutello 

 magis punctato. 



Hab. Mexico, Jalapa (Hbge) ; Beitish Hondueas, Belize (Blancaneaux). 



Sufficiently distinct from A. seriatus (Erichs.), a species of the Amazons valley, by 

 the characters above mentioned. The depression of the hind margin of the thorax on 

 each side of the scutellum is common to both species, and in some examples ( § V) has 

 a distinct tubercle on the inner side ; but the apical marginal stria is finer and nearer 

 to the margin, though variable in this respect. The scutellum has a few punctures at 

 the base on each side. The rows of shallow, oval punctures on the elytra are variable 

 in strength and number ; the sutural stria, which as usual is deeply impressed at 

 the apex, becomes a similar row before the middle, and continues as such to the base; 

 the six short sulci of the apex increase in length from the suture outwards, but the 

 longest does not reach the middle, and the smooth interstices are alternately moderately 

 elevated,- not sharply and greatly raised as in A. seriatus. The hindmost tibiae externally 

 are marked with arcuated scratches, mostly isolated, and the scratches do not form a close 

 reticulation as in A. seriatus. A Chiriqui specimen is figured. 



4. Acanthocerus vicarius. 



A. semipunctato (Germ.) proxime affinis et fcrsan ejus varietas geographica. Globularis, politus, saturate seneus, 

 cupreo-seneus vel cupreus ; thoracis stria margiuali ariteriore valida et integra, thorace et scutello 

 punctatis ; elytris sat regulariter et usque ad apicem striato-punctatis, striae submarginalibus punctis 

 prope apicem interdum conjunctis; tibiis posticis strigulis arcuatis insculptis. 



Long. 3|-4 millim. 



