X\ I-oBANCS. F0KR0STOMA. 43 



mesial lanceolate areolet extending from the base to a little before 

 the middle, joined to the anterior margin by a carina. Elytra a 

 little widened towards their apex ; the four costae distinct ; the 

 interstices not woolly, furnished with numerous distinct transverse 

 costae, which divide the surface into nearly square spaces. 



Xylobanus confnsus. 



(Plate XI. fig. 2.) 



Parallelus, ater, opacus; thorace septemareolato, lateribus ochra- 

 ceis ; elytris quadricostatis, interstitiis obsolete punctatis, costis 

 tenuibus numerosis transversis. £ • Long. 4 lin. 



Hab. Batchian ( Wallace). 



Thorax yellow, with a broad black mesial stripe, the anterior 

 border and the margins obscurely punctured. Elytra with the four 

 costae distinct ; the interstices have a dull woolly appearance, very 

 obscurely punctured, with very numerous fine transverse costae, 

 which are rather close together but somewhat irregular. 



This and the following species are somewhat aberrant forms, and 

 are therefore placed at the end of the genus. 



Xylobanus inixtus. 



(Plate XI. fig. 5.) 



Brevior, atro-fuscus, opacus, pubescens ; thorace septemareolato ; 

 elytris quadricostatis. Long. <3| lin. 



Hab. Waigiou ( Wallace). 



Dark fuscous, with the incrassated lateral margin of the thorax 

 rather paler. The posterior angles of the thorax are slightly 

 diverging and acute; the seven areolets are well defined. Each 

 elytron has four distinct costae, and in the first and fifth inter- 

 stices, as well as at the base of the second, third, and fourth, a fine 

 intermediate costa may be traced ; the interstices have numerous 

 transverse costae, placed somewhat close together, dividing the sur- 

 face into strongly transverse quadrangular spaces, except the first 

 and fifth interstices and the extreme base of the others, which have 

 two rows of irregular punctures, these rows being divided by the fine 

 intermediate costae above mentioned. 



This species is of particular interest, on account of its showing 

 the commencement of the intermediate costae on the elytra met with 

 in Metriorrhi/nclms. 



PORROSTOMA. 



Caste//t mi, Silbermann'a Rev. ZooL, iv. 1830, p. 20. 



Rostrum prolonged. Antennae dentate, more strongly so in tin 

 male than in thr female. Thorax with seven areolets. Elytra sub- 



