TETRIX BIPUNCTATUS. 213 



Fn. svec. 623. Gryllus elytris nullis, thorace in elytron 

 longitudinale extenso macula utrinque nigra rhombea. 

 Habitat in Europa. 



(C. Linnaeus, ' Syst. Nat.' ed. x, torn, i, p. 427. 1758.) 



864. G-RYLLUS Mpunctatns thoracis scutello abdominis longitudine. 



Giylhis elytris nullis, thorace in elytron longitudinale extenso 



macula utrinque rhombea nigra. Fn. 623. 

 Habitat in pratis siccioribus. 



DESCR. Est species e niinimis hujus generis. Manifeste 

 distinguitur scuto Thoracis producto ad longitudinem abdo- 

 minis. linea longitudinal! elevata, et punctis duobus oppositis 

 atris rhombeis, ssepe in medio longitudinis. Alx albae sub 

 hac crusta absconduiitur. Antenna breviores snnt in hac, 

 qnam in alia ulla. Elytra e thorace producto longitudine 

 abdominis. 

 (C. Linnaeus, ' Fn. Suec.' p. 235, 1761.) 



LE IMAGO.- -Colour brown, of a wide range of 

 tints, extending almost from white to black ; variously 

 marked and mottled ; surface rugose ; build stout. 

 Lem/th (including pronotum) 7 '5-11 mm. Vertex 

 produced between the eves in a broad obtuse angle ; 

 eyes rather distant. Frons having a longitudinal 

 median sulcus with raised edge, the median ocellus 

 being: at its forward end. Antennae short and slender. 



o 



Pronotum narrow in front, wider above the wings, 

 then narrowing, and ending bluntly, but reaching the 

 tip of the abdomen ; median carina raised considerably ; 

 two black spots sometimes present just behind the 

 widest part (whence the specific name) ; side flaps 

 bisinuate behind. Elytra, reduced to tiny pads, situated 

 in the more dorsal sinus of the pronotal flaps. Wrings 

 quite small and probably useless as organs of flight. 

 Prosternum produced a little in front. Hind femora 

 stout. Xo pad between the tarsal claws. 



FEMALE IMAGO (Plate XXI, fig. 1). In appearance 

 much like the male. AYings much more reduced. 

 Valves of the ovipositor rather long, rough, and 



finely toothed. 



/ 



XYMPH.- -In addition to its softer texture, the pro- 

 notum is shorter but has a more elevated median 

 carina. The lateral flaps of the pronotum are simply 

 curved behind, and not bisinuate. 



