152 MR. A. G. BUTLKR ON A NEW ORTHOPTERON. [Mat. 2, 



different in colour : primaries snow-white with black dotted costa ; 

 a black reniform spot intersected by the lower discocellular veinlet, 

 which is white ; apical area dark olive-green spotted with white, as 

 in JE. simplonia : secondaries dul] olive-green, with pale buff veins 

 and silvery-white spots, and abbreviated irregular bands similar to 

 those of ^. simplonia. Expanse of wings 1 inch 10 lines. 



5 . Differs from the male above in the darker apex of the prima- 

 ries and the more distinctly visible under-surface markings upon the 

 secondaries : below in the bright sap-green apical area of primaries 

 and ground-colour of secondaries, and the bright orange colouring of 

 the veins on the latter wings. Expanse of wings 1 inch 10 lines. 



Western Thibet. 



Hesperiid^. 



17. AnTIGONUS VASAVA. 



Achlyodes vasava, Moore, Proc. Zool. Soc. 1865, p. 786. 

 Upper Assam, 19th March, 1877. 



EXPLANATION OP PLATE XV. 



Fig. 1. Ixias watti, p. 151. 



2. Charaxes watti, p. 148, 



3. Ypihina ordinata, p. 148. 



4. Teracolus iripunctatus, p. 149. 



Fig. 5. Euchloe venom, p. 1.51. 

 6, 7, Ixias frcquens, p. 151. 

 8, 9. Ixias dharmsala, p. 150. 



3. Description of a new Species of Orthopteron of the 

 Genus Anostostoma from Madagascar. By Arthur 

 Gardiner Butler, F.L.S., F.Z.S. 



[Received February 20, 1880.] 



The following remarkable Orthopteron was obtained last year from 

 a collection of insects made at Antananarivo by Mr. Kiugdon, 



Being a winged species, I should have supposed this insect to 

 be referable to a genus distinct from Anostostoma, had not the 

 experienced Orthopterist Herr Brunner von Wattenwyl kindly ex- 

 amined it for me and assured me that, although an aberrant form, 

 it undoubtedly belonged to that group. 



The species is readily distinguishable from the other described 

 forms, not only by the possession of elytra and wings, but by many 

 other particulars of structure, notably by the well-marked transverse 

 crest upon the front of the face and just above the insertion of the 

 mandibles. 



Anostostoma alatum, n. sp. 



Length from vertex of head to extremity of abdomen 29 millims. ; 

 from vertex to extremity of labrum 16 millims. 



Male. Greenish brown, becoming darker when dry ; face, 

 mandibles, margins of prothorax, and knees blackish piceous. 



Head large (but apparently not so much so as in A. cunicvlaior), 



