276 [November, 



3rd joint (or 1st joint of the flagellum) emarginate ; characters which, 

 at once refer the insects to the group of Belyta rather than that of 

 Diapria. On comparing them with Forster's tables and observations 

 in the Hjm. Stud., Hft. ii, which remain to this day the best authority 

 upon the subject, but contain only European forms, I cannot assign 

 them to any established genus, and it is necessary to invent a new one. 

 This I have named Tanyzonus, in allusion to the attenuated form of 

 the female thorax ; I believe this compound word, however obvious, 

 has not been used before. The genus being founded upon both sexes, 

 and accompanied by a biological notice from Mr. Hudson, tl;e dis- 

 coverer, which gives a glimpse of the unknown habits of an- entire 

 group, possesses a degree of completeness and ^stability far from 

 common amongst insects of this kind. 



TANYZONUS, n. g. 



? . Oculi pilosi. Ocelli ohsoleti. Antennce clavatcB, l6-articulatcs. 

 Thorax angnstissimus, compressus, ubique in eadem planitie situs qua et caput 

 et petiolus,ccetero ahdomine midto minus elevatus ; protJiorax in colli speciem 

 hreviter productus ; mesonotum spina ohtusa utrinque armatum ; scutellum 

 nullum ; metatJiorax horizontalis, apice quadrispinulosus . Alee omnino nulla. 

 JPedes graciles, subelongati, femorihus tibiisque clavatis. Abdomen capite 

 cum thorace paulo longius ; segmentum 1^'"^ metathoracis fere longitudine, cy- 

 lindricum, angustum, 3-canaliculatum ; pars posterior maxima, elliptico- 

 globosa, thorace fere quintuplo latior, e segmentis 5 (ut videtur) superne 

 confiata, quarum tria apicalia brevissi^na, anmdiformia, suturis cegerrime 

 distingtiendis . Terebra occulta. 



<? . Longe alius. Oculi vix pubescentes. Ocelli conspicui. Antennae 

 longiores, filiformes, \4.-articulat(E, articulo '6^ extus exciso. Thorax omnibus 

 numeris absolutus, elevatus, capite multo latior ; mesonotum bisulcatum, ad 

 paraptera spinula utrinque armatum; scutellum optime determinatum,fossula 

 antecedente instructum ; metathorax declivis, petiolo plus duplo latior, apice 

 bispinulosus. Alee amplce, nervis sicut in Belyta instructce, sed cellula radialis 

 longissima, apice aperta. Abdomen quale in ? , sed nusquam thorace latius ; 

 pars posterior minus inflata ; segmenta apicalia in conspectu 6 hrevissima, 

 annuliformia. 



T. BOLITOPHIL^, n. Sp. 



$ . Rufo-testaeea, oculis nigris ; paulo obscuriores sunt antennarum 

 radiculcB, prothorax, metathoracis Umbus undique, petioli basis cum segmenti 

 2^^^ margiite antico. Corpus totum IcBve, pills pallidis plus minus obsitum. 



S . Niger, antennis, mesothorace, pedibusque rufis ; abdomen infra et 

 apicem versus rufo-piceum. Alee subhyalince, nervis et puncto stigmatico 

 sordiderufo-testaceis; prcesto sunt in ala anteriore nervus subcostalis ; radialis 

 costcB parallelus, ante alee apicem abruptus ; inter cubitalis 1'^^^ curvatus, im- 



