28 ORIENTAL CICADID.^. 



aual organs might prove of diagnostic value, but too much value may be placed on the 

 constancy of such characters.* 



T. melanoptera, however, is only found on the mainland, whilst T. fasciata is as rigidly 

 confined to the Malayan Islands — the distribution and close affinity of the two species ? being 

 exactly parallelled in Ehopalocera by Papilios agenor and memnon, of which the first (as I have 

 previously pointed outf) is the continental and the second the insular species. 



4. Tosena montivaga, n. sp. (Tab. XIII., fig. 6, a, h.) 



<? . Head and thorax above black ; head with the eyes and the lateral margins and anterior angles 

 of vertex, and two small spots on anterior margin of pronotum ochraceous ; lateral and posterior margins 

 of pronotum, lateral margins and a large basal patch to mesonotum pale greenish inclining to ochraceous, 

 the basal patch contains two small black spots ; abdomen above black, its apical area covered with greyish 

 pile. Body beneath and legs black; face, eyes, a spot connecting face and eyes, lateral margins of 

 prosternum, apices of femora, and a spot on coxre, ochraceous. 



Tegmina black, the costal membrane and venation pale greenish, and with a narrow oblique whitish 

 fascia crossing tegmina beyond radial area. Wings black. 



2 . Differing from the male in having the transverse fascia to tegmina broader, the basal patch 

 to mesonotum ochraceous (this is probably only varietal, or the result of discoloration), and the abdomen 

 uniformly black, not greyish, at apex. 



In this species the lateral margins of the pronotum are not distinctly toothed, the rostrum passes the 

 inner angles of the opercula, which are short and transverse, with their posterior margins oblique. 



Long. excl. tegm. <y , 51 milhm. ; 2,41 millim. Exp. tegm. <? , 130 millim. ; ? , 128 millim. 



Hab.— Continental India: Naga Hills (coll. Dist.). 



This handsome and distinct species is allied to T. fasciata and T. melanoptera, from both of 

 which it differs by the black abdomen, the pale basal patch to the mesonotum, the green 

 costal membrane to the tegmina, and the narrow oblique pale fascia to same. The opercula 

 are also different in shape, being shorter, broader, more nearly meeting at inner angles, and 

 with their posterior margins obliquely straight. 



5. Tosena depicta. (Tab. III., fig. 11, a, h.) 



Tosma dcpkta, Distant, Ann. & Mag. Nat. Hist. ser. 6, vol. ii. p. 323 (1888). 



Head and thorax above black ; head with a spot at apex of front and a spot at each anterior angle 

 of vertex, two central spots on anterior margin of pronotum, the posterior margin of pronotum, four spots 

 in transverse series on mesonotum, and the posterior margin of mesonotum ochraceous ; the centre of basal 

 cruciform elevation black. Abdomen above reddish ochraceous, with a central, longitudinal, narrow, 

 dorsal, fuscous fascia. Head beneath, sternum, a lateral fascia to opercula, and legs black ; a spot at 

 base and one on each side of base of face ; coxas, apices of femora and tibia, tarsi (excluding base) and 

 rostrum (excluding apex) ochraceous. Body beneath ochraceous, the basal segment blackish. 



Tegmma dark olivaceous, the costal membrane and the venation reddish ochraceous, and with a trans- 

 verse and slightly oblique greyish-white fascia near centre, not extending above the base of the second ulnar 

 area ; posterior basal margin narrowly reddish ochraceous. Wings black, the basal area reddish ochraceous, 

 with its posterior margin black. 



* See Mr. Beddard's account of some remaikable variations in the internal organs of a species of earthworm iPeriomix 

 excavatus), as quoted in Wallace's ' Darwinism,' ji. 60. •- ^ j 



i ' Khop. Malayana,' p. 342, note. 



