Doctrine of Affinity and Analogy. 99 
Character Naturalis. 
CORPUS depressum, oblongum, alatum. 
CaPvuT transversum, subrhomboidale, leviter inclinatum, 
thoracis sinu receptum, sessile. Labrum transversum, 
apice rotundatum*.  Mandibule forcipatæ, breves, sub- 
triquetro-trigonæ, apice edentulæ acute, basi intus in 
lobum rotundatum dilatatæ*. Maxille breves: lobo in- 
teriori incurvo unguiformi acutissimo, intus setis ciliato; 
exteriori palpiformi biarticulato lobo interiori arctissime 
incumbentil. Palpi maaillares maxilla vix longiores, in- 
crassati, cylindrici, quadriarticulati: articulis brevibus ; 
primo reliquis minori obconico, sequentibus duobus cy- 
lindricis æqualibus, extimo paulo longiori apice trun- 
cato$. Labium minutum, brevissimum, apice tridenta- 
tum vel subtrilobum : lobis rotundatis ; intermedio setis 
duabus instructo|. Palpi labiales securiformes triarticu- 
lati: articulo primo brevissimo ; secundo paulo majori 
subtriangulari; extimo maximo fere trapeziformi{. Men- 
tum trilobum: lobis subæqualibus, acutis **. Antenne 
capite longiores, undecim-articulatz, filiformes: articulo 
primo incrassato arcuato; secundo sequentibus breviori 
apice incrassato; reliquis longitudine fere æqualibus, 
oblongiusculis, extimo acutott. Oculi laterales, minus 
prominentes, subrotundi. Nasus declivis, apice trans- 
versus. 
Truncus. Thorax transversus, antice angustior, sinu lato 
_ pro receptione capitis exciso; lateribus rotundatis mar- 
! ginatis: margine explanato recurvo; angulis anticis et 
posticis rotundatis. Prosternum et mesosternum linea- 
ria. Metasternum antice et postice mucronatum. Scu- 
* TAB. III. Fig. 3. a. + Ibid. c. t Ibid. d, ba. § Ibid. c. 
l Ibid. b. bbc. q Ibid. b. a a. ** Ibid. e. ++ Ibid. f. 
o 2 tellum 
