GRYLLID^B. 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 subcarinatum, nigro bivittatum et nni- 

 maculatum ; protkorax nigro birittatus, lateribus subrectis ; cerci 

 oviducfu paullo breviores ; oviductus rectus ; pedes pubescentes, 

 fusco conspersi, tibiis posticis utrinque setosis subserratis et quadri- 

 spinosis; alee anticee inordinatim reticulata>^ abdomen longe super- 

 antes, punctis quatuor subcoslalibus albidis ; al< posticce 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 ridge 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 minutely serrated and with four spines on each side ; 

 spines on one side alternate with those on the other. Fore wings 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 tibia? are shorter than in most species of this genus and it 

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



Siam. In Mr. Saunders* collection. 



Ceylon. 



18. PLATYDACTYLUS PRJECIPUUS. 



Fcem. Testaceus, tomentosus ; caput antice subcarinatum ; palporum, 

 articulus 3us oblique truncatus; prothorax carinis indeterminatiSj 

 Lateribus subreflexis ; cerci corpore vix breviores ; oviductus abdomine 

 multo longior ; tibiae posticce utrinque serratce et quadrispinosce, spinis 

 interioribus arcuatis ; alee anticee abdomen paullo super antes ; 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. Antennae piceous 

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



