On the Rhynchotal Family Lygneida?. 257 



character was readied, 7?. halecina, L., is there to show us, 

 for within the limits of this highly variable species, the vocal 

 sacs may be said to be still in process of evolution ; situated 

 behind the commissure of the jaws, as in R. esculenta, R. monte- 

 gumee, R. areolata, B. & G., and R. capito, Leconte, but unlike 

 those of all other frogs, they are either internal or external, 

 showing every degree of development, and when external 

 they form folds which, in certain individuals, have a tendency 

 towards the invagination characteristic of the sacs in 

 R. esculenta. We may well assume the direct ancestors 

 of R. esculenta to have passed through such stages in the 

 course of parallel evolution. 



XXVIII. — Contributions to a further Knowledge of the 

 Rhynchotal Family Lygaeidee. By W. L. Distant. 



[Continued from p. 179.] 



Lygceus degeni, sp. n. 



Head, pronotuni, scutellum, corium, and body beneath 

 griseo-fuscous, two small central spots on pronotura, two 

 larger spots on clavus, and two still larger spots on corium — 

 one on each side of claval apex — black ; basal third of 

 lateral margin to corium, connexivum beneath, and legs pale 

 testaceous or ochraceous ; membrane pale fuscous, narrow 

 base, lateral margins, and an irregular discal, transverse, 

 angulated spot greyish white; antenna? ochraceous, the 

 apical joint fuscous, second joint a little longest, third and 

 fourth joints subequal in length; pronotum and scutellum 

 centmlly longitudinally carinate ; the upper surface is more 

 or less finely and obscurely very shortly pilose. 



Long. 8 nui). 



Hah. Abyssinia ; Taddecha, Mullka (Degen). 



Exopamera, gen. nov. 



Head robust, about as long as broad ; eyes projecting 

 beyond the anterior angle of pronotum but not reaching its 

 anterior margin ; antenna? with the basal joint stoutest and 

 considerably passing apex of bead, second joint longest; 

 rostrum with the basal joint not quite reaching base of 

 head, its apex scarcely passing the anterior coxse; pronotum 



Ann. & Mag. N. Hist. Ser. i>. Vol. ii. 20 



