INSECTA MADERENSIA. 



457 



Head and prothorax rather coarsely punctured and subrugulose, more or less clouded or infus- 

 cate ; the latter short, transverse, and rather waved behind. Elytra deeply crenate-striated ; 

 with the small, thickened callosity within the shoulder of each slightly dusky. 



A most distinct little Cryptocephalus ; and, although related, in size and general 

 aspect, to the C. mimdm and signatlcoUls of higher latitudes, yet with abundant 

 characters of its own which altogether separate it, specifically, from either of those 

 insects. In its regularly cre?^«^e-striated elytra, indeed, it recedes from every 

 Cryptocephalus with which I am acquainted ; whilst its almost opake surface, its 

 deeply pimctured, comparatively short prothorax, and its suhdepressed form, 

 entirely remove it from any of the small European species of which the common C. 

 mlmitus may be regarded as the type. It is apparently extremely rare. During my 

 constant researches in Madeira, I have met mth only a single example,— captm^ed, 

 towards the end of May 1849, at the extreme head of the Ribeiro de Santa Luzia, 

 by brushing the rank vegetation at the foot of the perpendicular rocks on the steep 

 bank immediately to the left of the great Waterfall. Two more specimens hoAv- 

 ever have been subsequently communicated to me by the Rev. E. T. Lowe, by 

 whom they were taken ia the north of the island (during the summer of 1851), at 

 Sao Vincente. 



Genus 151. CHRYSOMELA. (Tab. IX. fig 7.) 



Linnaeus, Syst. Nat. edit. i. (1735). 



CV/jus mediocre, plus rainusve rotundato-ovatum, convexura, sjepius splendore superbiens : capite sub- 

 porrecto ; oculis ellipticis (intus hand emarginatis) : prolhorace transverso, postice lato (sed ely- 

 trorum vix latitudine), ad latera saepius marginato ; prosterno postice in lobum deplanatum plus 

 uiinusvc elongatuni (in mesosternum receptum) producto : eli/tris ad apicem rotundatis, pygi- 

 dium omnino tegentibus (in specie nostra laterahter compressis et marginem versus utrumque 

 valde coiTUgato-rugosis, unde nomeu subgenericum Rhyssohma proposui) : alis plerumque amplis. 

 Antennce apicem versus leviter incrassatjE, in typicis minus elongate, inter oculos insertse sed basi 

 baud approximate, articulo primo robusto, secundo brevi, tertio, quarto quintoque subgracilibus 

 (tertio longiuseulo, quarto quintoque sequalibus), reliquis paulo crassioribus suba;qualibus. 

 Labruin (IX. 7 a) submembranaceum transversum, antice leviter bilobum. Mandibula fere ut in 

 Cryptocephalo. Maxilla (IX. 71) bilobfe : hbo externa lato obtuso subcylindrico setoso, vix 

 palpiforrai : interno vix breviore, angusto, submembranaceo, longe setoso. Palpi (articulo 

 mnxillarium ultimo incrassato plus minusve subsecuriformi excepto) fere ut in Crji^tocephalo. 

 Mentwn (IX. 7 c) subcoriaceum transversum, apice plerumque leviter emarginatum. Ligula 

 ampla subcoriacea, apice truncata et in medio minute bifida. Pedes sat robusti subretractiles : 

 tibiis vel simpHcibus, vel apicem versus externum dente instructis. 



The Clmjsomel(B, as ah-eady stated, may be recognised from the Cnjptocephali 

 by their' more rovmded, or ovate, outline, convexer bodies and more exposed 

 heads, by then- elytra not being abbreviated posteriorly (but entirely covering 

 the abdomen), by their more transverse, less globose and frequently margined 



3n 



