412 SUPPLEMENT. 



When fresh this fine species is of a beautiful bluish-green colour, which is soon lost 

 after death. The Misantla specimens were cut out of tree-trunks by Mr. Flohr. 



HETEROSTERNUS (p. 287). 



Heterosterxms buprestoides (p. 288). 



The type specimen of this rare species, Mr. Flohr informs me, on the authority of 

 M. Blanchard, was taken near Zongolica ; a second example, he says, has been taken 

 on an Aguacatillo tree between Huatusco and Mirador ; and a third, now in the 

 Philadelphia Museum, was obtained from Sumichrast, but in what locality it was 

 found is not known. 



PARISOLEA (p. 288). 



Parisolea alba (p. 288). 



Parisolea fulva, antea p. 288, Tab. XVII. fig. 1. 



The locality of this species is Jalapa, where it was cut out of old or felled Liquid- 

 ambar trunks (Flohr). 



P. fulva was founded on examples found in the manner above-mentioned, but curiously 

 discoloured by being kept in a damp locality ; it must therefore be withdrawn. 



METAPACHYLUS (to precede the genus Aspidolea, p. 296). 



Gen. Pachylo affinis, sed valde differt mandibulis longe exsertis reeurvis acuminatis : Gen. Ruteliscce quoque 

 affinis a quo differt inter alia labro lato corneo. Oblongo-quadratus, convexus. Caput inerme, fronte 

 paullo declive ; clypeo semiovato, marginibus praecipue antico reflexis. Labrum latum, conspicuum, ab 

 epistomatis basi exstans. Handibulae sicut in Ancognatha etc. recurvse, acutse. Mentum parte ligulari 

 parva, triangulari. Antennae 10-articulatae, clava caeteris articulis conjunctis S longiore, $ paullo breviore. 

 Mesostemum inter coxas paullulum incrassatum. Pedes sat breves ; tibiae subcompressae, setosae, 4 

 posticse margine apicali setuloso et extus late unidentato. Tarsi setosi ; ungues graciles, aequales, exteriore 

 in 5 omnibus pedibus basin versus longe unidentato, in $ in pedibus 4 posterioribus validius unidentato, 

 pedibus anticis ungue anteriore incrassato, a basi valde inflexo et apice valde inaequaliter fisso. 



The interesting form on which this genus is founded partakes of the characters of 

 Pachylus, Oryctomorphus, and Parastasia, with the allied Indian forms Didrephano- 

 plwrus, Peperonota, &c, genera widely separated in the received classification. It has 

 much also in common with the genus Butelisca, which would be better placed in its 

 vicinity than in the group Rutelina, the tarsal claws not being really unequal in length, 

 their different curvature only making them appear so. The North-American genus 

 Polymoechus apparently belongs to the same hitherto unindicated group of genera. 



l. Metapachylus sulcatus. (Tab. XXIV. figg. 19 <j , 20 ? .) 



Niger, politus, elytris macula utrinque juxta scutelli basin et interdum thoracis lateribus, femoribus apice 

 maculaque frontali, flavo-testaceis, antennis et palpis piceo-rufis ; clypeus et frons minute scabrosa ; 

 thorax transversus, sparsim punctulatus, linea dorsali lata impressa a basi ad apicem mediocriter rotundato- 

 angustatus, tenuiter marginatus, linea impressa marginali basi medio late interrupta, angulis posticis 



