INSECTA MADERENSIA. 587 



depression, albeit to answer another purpose, which is more or less traceable 

 throughout the subcortical tribes). 



458. Achenimn Hartimgii. 

 A. nigrum nitidum, capite prothoraceque parcius (hoc per plagas) punctatis, elytris rufis, regioue 



scutellari leviter nigrescente, antennis pedibusque rufo-ferrugineis. 

 Long. Corp. lin. vix 4. 



AcJienium Hartungii, Heer. 



Habitat Maderam australem, rarissime : sub lapidibus super promontorium Cabo Gerajao d. 25 Feb. 

 A.D. 1850 detexit el. Os'''^ Heer, qui in bouorem Dom. G. Hartung, insectorum plantarumque 

 Maderensium scrutatoris, in hoc opusculo speciem citare voluit. 



A. exceedingly depressed, and deep black. Head and prothorax highly polished ; the former large, 

 subquadrate-cordate, and rather remotely punctured ; the latter with its punctui-es (which are 

 nowhere dense) more abundant about its anterior angles and sides than elsewhere, and with a 

 few distributed along a narrow longitudinal space on either side of its disk, — which is itself 

 (together with a considerable portion of the surface, alongside it, behind) perfectly impunctate. 

 Elytra very lightly and irregularly punctulated ; rufous, with their extreme basal region (about 

 the scuteUum) more or less darkened. Antennce, palpi and legs rufo-ferruginous ; the last 

 (especially the femora) being at times more or less picescent. 



Closely allied to the A. depressum, Grav., of which I doubt whether it is more 

 than a geographical variety ; nevertheless, since Professor Heer (to whom we are 

 indebted for its admission into our present fauna) considers it to be distinct, I have 

 retained it as such. After comparing it carefully however with a large series of 

 that insect, collected on the southern coast of England, the only differences which 

 I can detect are the deeper punctures of its head and prothorax (the former of 

 which is a trifle larger, and has its hinder angles just perceptibly more rounded and 

 obtuse), its aknost entirely rufous elytra (the large triangular darker basal patch 

 which is there so conspicuous being here but slightly indicated, and occasionally 

 nearly evanescent), and the somewhat obscurer colom* of its legs. It was 

 discovered by Professor Heer, on the 25th of February 1851, beneath stones on the 

 Cabo Gerajao, or Brazen Head, 



Genus 202. LATHEOBIUM. 



Gravenliorst, Col. Micropt. 179 (1802). 



Corpus mediocre, elongato-lineare, subcylindricum : capite subquadrato-rotundato porrecto exserto ; 

 omlis sat parvis rotundatis subdemissis : prothorace suboblongo, angulis omnibus rotundatis : 

 alis plerumque amplis : abdomine hneari marginato ; segmento sexto in maiibus subtus triangu- 

 lariter emarginato, in fceminis vel integro vel apice producto. Antenna sub frontis margine 

 insertse, rectse, filiformes, articulo primo longiusculo robusto, ultimo acuminato-ovato. Instru- 



4f 2 



