I.OCUSTID.E. 371 



longitudinal and with three transverse impressed lines, first transverse line 

 interrupted: second very deeply bent hinclward ; lateral keels well defined 

 hiudward, where they, like the slightly rounded hind border, are black and 

 rugose, the black hue attenuated on the middle part of the hind border ; 

 fore border very slightly excavated; sides with a conical outline. Meso- 

 sternum and metasternum whitish, the latter hindward with a slightly 

 ascending cone. Mesosternum and metasternum very deeply notched. 

 Cerci setose, lanceolate. Oviduct curved, about one-third of the length of 

 the abdomen. Legs thick ; spines stout; hind femora about half the length 

 of the fore wings ; hiud tibiae with a few spines on the two lower keels, 

 which are approximate to each other. Fore wings rather broad, minutely 

 reticulated, shorter by one line and a half than the hind wings; principal 

 veins strongly marked; large areolets irregular; anal vein black; a black 

 streak on the basal vein ; costa much rounded, nearly straight towards the 

 tip; interior border nearly straight, rounded towards the tip; greatest 

 breadth of the wing before half the length. Hind wings pellucid ; apical 

 patch testaceous or green ; veins very pale testaceous or green. Length of 

 the body 21 lines; expansion of the fore wings 80 lines. 



It is typical of a section in the genus which includes the largest 

 species and to which M. thorucicum and M. Aztecurn also belong. The 

 prothorax is considerably longer than broad, which character distinguishes 

 it from M. Aztecum and it does not agree with the description of M. Tol- 

 tecum. It is nearly allied to Steirodon thoracicum, Serv., but the descrip- 

 tion of the latter does not fully agree with it. 



a, b. Mexico. From Mr. Glennie's collection. 

 c. Oajaca. From M. Salle's collection, 

 rf, e. ? 



. 8. MlCROCENTRUM CODLONIANUM. 



Phylloptera Couloniana, Sauss. Rev. Zool. 1861, 129. 

 Cuba. 



9. MlCROCENTRUM EXCELLENS. 



Fcem. Viride ; capul antice carinula lineari sulcata ; prolhorax disco 

 piano scite ruguloso stria longitudinali sfrigague Iransversa impressa, 

 vitlis duabus luteis, lateribus conicis, mnrgine postico rotundalo ; 

 mesosternum et metasternum valde incisa; oviductus brevissimus ; 

 femora quatuor anteriora bispinosa ; alee anticce costa paliide flava ; 

 alee posticce diapharue, striya apicaii lata viridi. 



Female. Grass-green, smooth, shining. Head a little narrower than 

 the prothorax, with a furrowed keel of equal breadth on the fore part of the 

 vertex and with a conical elongation of the front between the eyes. Eyes 

 brown, mottled with black, prominent, nearly round. Antenna? tawny, 

 green at the base. Prothorax with a flat finely rugulose disk, of which the 

 fore border is one-fourth of the breadth of the hind border and which has 

 an indistinct impressed longitudinal line and in the fore part an acutely 

 angular transverse impressed line ; a luteous stripe on each of the well- 

 defined lateral keels; fore border straight; sides with a conical outline; 

 hind border rounded. Mesosternum and paetasternum deeply notched. 



