1880.] 



MR. A. G. BUTLER ON A NEW ORTHOPTERON, 



153 



inclined downwards, rugulose beyond the eyes, otherwise smooth ; 

 swollen at the sides, with a distinct marginal ridge ; a nearly 

 Y-shaped ridge between the eyes connecting the three ocelli, which are 

 smooth and of an amber-brown colour, the two posterior ocelli placed 

 on the outer margins of the furca of the ridge facing the insertion 

 of the antennae ; front of head crossed by a broad shining swollen 

 crest, in front of which the face is distinctly transversely striated. 



Eyes large, oval and prominent, placed in a slight depression on 

 each side of the head. 



Atitennce multiarticulate, consisting apparently of about 150 joints, 

 but, owing to the dense pubescence of the terminal articulations, only 

 about 100 can be counted ; the basal joints up to about the twenty- 

 fourth smooth and without hairs, but from this point there is a very 

 gradual increase in pubescence to the extremity : first joint large 

 and cylindrical, covered sparsely with fine shallow impressions ; 

 second joint of about a third the length of the first, cylindrical and 

 slightly depressed ; third joint elongate-cylindrical and slightly 

 rugulose, nearly twice the length of the second ; remaining joints 



A. Anostostoma aXatum ; B. Front of head ; C. Mouth-organs from below ; 

 D. Forked ridge, with ocelli. 



considerably shorter, but similar in character to the third, excepting 

 in the pubescent clothing of most of them. 



Mandibles powerful, incurved, cylindrical towards the base, de- 

 pressed from the middle, with flattened cutting-edge armed with 

 seven unequal teeth, the last of these being the acuminated extremity 

 of the mandible : unlike the mandibles of A. cuniculator, they are 

 perfectly symmetrical ; their surface is distinctly uneven. 



Labrum elongated, extending to the commencement of the cutting- 

 edge of the mandibles ; bottle-shaped, slightly flattened, transversely 

 striated, with central longitudinal carina diverging in the middle to 



