GRYLLID^. 83 



16. Platydactylus helvolus. 



Platydactylus helvolvus, Serv. Orth. 366 — Gryllus dorsalis, Burm. Handb. 

 Ent. ii. 733 — Gryllus (Phalangopsis) helvolus, Haan, Verh. Nat, 

 Gesch. Ned. Ind. Bez. Ins. 235. 



Java. Borneo. Japan. 



17. Platydactylus indecorus. 



Fcem. Fulvus, tomentosus ; caput subcarinalum, nigra bivittatum et uni- 

 tnacnlalum ; prothorax nigro biiittatus, lateribus subrectis ; cerci 

 oviductu pauUo breviores ; oviductus rectus ; pedes pubescentes^ 

 fusco conspersi, tibiis poslicis utrinque setosis subserratis et quadri- 

 spinosis; ala anticcB inordinaiim reticulalw, abdomen longe super- 

 antes, punctis quaiuor subcoslaiibus albidis ; alee poslicce valde 

 longiores. 



Female. Tawny, tomentose, slender. Head with two black stripes on 

 the vertex ; these stripes join a large black spot in front, where there is a 

 prominent rido;e between the eyes ; sides testaceous. Eyes small, not pro- 

 minent. Palpi testaceous; third joint obliquely truncated. Prothorax 

 transverse, a little narrower in front, with two black stripes; in a line with 

 the stripes on the head ; space testaceous between the stripes and the sides, 

 which are nearly straight. Dorsum of the abdomen mostly piceous. Cerci 

 a little shorter than the oviduct, which is straight and as long as the abdo- 

 men and has a black tip. Legs stout, pubescent, speckled with brown ; 

 hind tibiae setose, very miuutely serrated and with four spines on each side ; 

 spines on one side alternate with thdse on the other. Fore winfis irregularly 

 reticulated, extending much beyond the abdomen, with four whitish points 

 along the scapular vein ; space between the keels and the costa pellucid, 

 with seven very oblique branches of the mediastinal vein (of which the 

 seventh is forked) and with regular transverse sectors. Hind wings 

 extending much beyond the fore wings. Length of the body 7 lines. 



The hind tibiae are shorter than in most species of this genus and it 

 approaches P. continuvs, which differs still more from the typical form. 



Siam. In Mr. Saunders' collection. 



Ceylon. 



18. Platydactylus pr^ecipuus. 



Foem. Testaceus, tomentosus ; caput antice subcarinatum ; palporum 

 articulus 3us oblique truncalus; prothorax carinis indeterminatiSy 

 lateribus subrejlexis ; cerci corpore vix breviores ; oviductus abdomine 

 mullo longior ; libice poslicce utrinque serralee et quadrispinosce, spinis 

 inlerioribus arcuatis ; alee anticce abdomen paullo superanles ; alee 

 posticcE valde longiores. 



Female. Testaceous, tomentose. Head as broad as the prothorax,^ 

 prominent between the sockets of the antennae. Eyes prominent, slightly 

 and transversely elongated, narrowest in front. Third joint of the palpi 

 clavate, obliquely truncated, longer than the second. Antennas piceous 

 testaceous towards the base, very much longer than the body ; first joint 



