192 I.J Iv. Chopard : Cavernicolous Orthoptera. 517 



genital plate triaiijjular with convex borders, apex 



subacute, ovipositor rather long, acute al apex ... D. niiinitn, Chop. 



— Medium size (18 — 20 mm.); posterior fem- 

 ora spined beneath; anterior tibiae with 3, inter- 

 mediate ones with 2 inferior spines : legs, cerci 

 and face whitish : subgenital plate of 9 triangular. 

 \ery narrow, subtruncate .It apex /). ripiralis. Hv. 



3. Posterior femora unarmed beneath ; gen- 

 eral colour rufous without brown markings on 

 the disk of pronotuni ; size rather small ("12 — id 

 mm.) ... ... ... 4- 



— Posterior femora armed beneath with small 

 spines on one edge at least ; body and legs very 

 often marbled with fuscous ; size medium or large 

 1 1 6 — 35 mm. I .. ... 6. 



4. Frontal rostrum divided into two acute 

 tubercles, very widely se])arated ; epiphallus of (^ 

 cylindrical with its apex free, crescent shaped: 

 subgenital pl.ite of 9 triangular, ovipositor short 

 with superior valves weaklv excivated near the 



apex .... D.feai, Chop. 



— Frontal rostrum very short or truncated at 

 apex; epiphallus of r*' rather large, depressed, 

 trapezoidal or Y-shaped; subgenital plate of 9 

 rounded, ovipositor longer tlian the ccrci with 

 superior valves regularly incurved 5. 



5. Frontal rostrum short, truncated and feeb- 

 ly divided at apex ; intermediate tibiae unarmed 

 beneath ; large internal spur of posterior tibiae 

 shorter than the metatarsus which is spined be- 

 neath on .all its length ; subgenital pl;ite of r' 

 truncated at apex, epiphallus trapezoidal with 

 rounded angles ; inferior valves of ovipositor .irmed 



with 12 teeth towards the apex .. ... D. by^vifrons. Chop. 



— Frontal rostrum very short, divided into two 

 small triangular tubercles, almost crushed ; inter- 

 mediate tibiae armed beneath with 2 spines on each 

 border ; large internal spur of posterior tibiaeequal- 

 ing the metatarsus which is carinatedand unarmed 

 in its aoical half; subgenital plate of c? rounded, 

 epiphallus Y-shaped (pi. xxii, figs. 21 and 22) ; infe- 

 rior valves of ovipositor armed with 6 large denti- 



culations towards thi- apex... ... D. vitiilisi. Chop. 



6. Medium sized species (16 — 20 mm.) ; /tli 

 tergite of males without process. General colotir 

 rufous with fuscous markings ... ... 7. 



— Large sized species (25 — 35 mm.); 7th 

 tergite of males usually with a long process extend- 

 ing to the apex of abdomen ; tegument very thick, 

 general colour brown or fuscous or rather bright, 

 mixed with yellow and whitish ' ... ... 0. 



7. Posterior feinora armed beneath with 7 — S 

 small spines on the internal margin. Coloration 

 yellowish rufous, marbled v/ith fuscous markings ; 



' The Diestnimmeiia of this group are large insects, none of which seem to 

 inhabit caves exclusiveh'. .'\ccordingly their tegument is more resisting than that 

 of the species of the preceding group. The long process of the 7th abdomin.il 

 tergite of the males is ver\- remarkable and I thought it characteristic of the 

 group ■ yet it seems absent in several species, as Karny does not speak of it in .1 

 recent description (D. ingens. Karny, iyi8,) and the male of D. marinorata, Haan, 

 of the Brunner collection does not appear to possess such a process, but its posterior 

 end being very much dam.aged does not permit of being quite certain. 



