118 
NOTICE OF A NEW ORDER OF HEXAPOD INSECTS. 
BY PROPESSOE J. O. WESTWOOD, M.A.^ F.L.S. 
In the course of last year, Mr. H. Deuny placed in my hands 
examination a parasitic insect, found upon the beaver, which seem 
first sight half-way between a flattened flea and a diminutive cockro; 
and which has proved to belong to none of the recognized Orders 
hexapod Annuhsa. I read a description of this insect, under the m 
of FlatyTpsyUus castorinus, before the Ashmolean Society of Oxf, 
during Michaelmas Term, 1868 ; but, as that Society is very dilator 
publishing its Proceedings, I send a short notice of the character 
the insect for publication in ' The Entomologist's Monthly Magazi 
Order, ACHREIOPTEEA, Westwood. 
Corpus ovale, valde depressum, coriaceum, setigerum. 
Os {mandihulis?) maxillis, labia palpisque quatuor instructum. 
AntenncB laterales, postice reflexce, tri-articulatw, articulo ultimo («, 
Pulice) annulato. 
Prothorax magnus, scutiformis, margine postico sinuate. 
Mesothoracis scutellum triangular e. 
Ales anticcE coriace<B, plancB, venis carentes, hrcves, coalites, basin abdom, 
attingentes ; sutura recta. 
Al(s jJosticcd obsoletce. 
Pedes cursorii {saltatorii ?) , tibiis calcaratis, tarsis quinquc-articula 
bi-unguiculatis. 
Metamorphoses ignotee. 
Victus parasiticus in Castorem, more Pulicis. 
PLATYPSTLLUS, nov. gen. 
Caput horizontale, semi-circulare, angulis posticis sub-truncatis, anteui 
truncatura insertis. 
Antenna longitudine dimidium prothoracis ^quantes, articulo bas 
elongato, cylindrico, secundo eyathiformi, extus longe setoi 
tertio ovali, ex annulis octo (ut in Pulice) formato. 
Maxill(B motu transverso, lobis duobus apicalibus instruct*, exter; 
majori, semi-ovali, piano, apice spinuloso, extusque dense setigei 
interno tenuissimo, membranaceo, margine sub-spinuloso. Pal 
maxillares quadri-articulati, articulo ultimo conieo. 
Mentum oblongum, corneum, jugulo transverso antice insidens. 
Labium transversum, lateribus in augulum productis, margine auti( 
