BLATTID^ PRESEllVED IN AMBER, FROM PRUSfSlA. 341 



vennlpe. Anal field rather elongate and narrow, anal vein near its apex 

 curved sharply inwards to the sutnral margin. Front femora on anterior 

 margin beneath with 4-5 stout spines, succeeded distally by numerous closer 

 set and smaller spines; two spines on the posterior margin near the apex. 

 Mid- and hind-femora with 4-5 long spines on both margins beneath. 



-ITT 



Genicular spines long. Formula o£ apical spines r, j j. Sub-genital lamina 



almost symmetrica], posterior margin bisinuate ; the styles short, situated in 

 the sinuations. Cerci moderate, with 9 visible joints. 



? . Similar to c? , but shorter and rather more robust ; sub-genital lamina 

 semi-orbicular, ample. Total length (^^ & ? ) 18 mm. 



One example (6722) is a mere fragment, only the pronotum, tegmina, wings, 

 and one leg remaining, the rest having probably been devoured by some 

 predaceous insect. 



ISCHXOPTERA KLEBSI, Sp. n. (PI. 47. fig. 4.) 



c? c?- ^os. o^oo, 5481, 6701. 



cJ . Allied to /. gedanensis, Germ. & Ber. Antennge considerably longer 

 than the body and tegmina. Eyes rather wide apart. Pronotum trapezoidal, 

 anteriorly subtruncate, freely exposing the vertex of the head, posteriorly 

 most obtusely angled, sides deflexed, disc with two oblique and shallow 

 impressions. Tegmina and wings exceeding the apex of the abdomen. 

 Venation of tegmina and armature of femora as in I. gedanensis. Sub-genital 

 lamina hirsute, almost symmetrical, and wilh a pair of stout, short hirsute 

 styles, placed close together near the middle, the right style a little stouter 

 than the left and with some strong short setas near its apex. Cerci 10-jointed, 

 sub-fusiform, not surpassing the apex of the tegmina. 



Total length 18 mm. 



This species is undoubtedly very close to /. gedanensis, but the different 

 form of the sub-genital lamina and styles serves to distinguish it. 



ISCHNOPTERA PERPLEXA, Sp. n. (PI. 47. fig. 5.) 



<$ S ' Nos. 0^75, 5491. ?. No. 0.J.77. 



^ . Closely allied to the two preceding species, but smaller than either. 

 Sub-genital lamina as in 7. Mebsi, but more hirsute, and the styles shorter, 

 their dorsal surface furnished with very stout setae. 



? . Similar to ^ ; sub-genital lamina ample, semi-orbicular ; cerci stouter : 

 tegmina shorter. 



Total length (J) 14-5-15-8 mm. ; ( ? ) 13-15-^ mm. 



It is very difficult to separate these three closely allied species from one 

 another from an examination of the teoniinal venation and ventral surface 



