370 METAMORPHOSIS 



Ceraphron cornutus. Jurine Hymenopteres. (PI. 13.) 

 Oxyurus frontalis . Lam. Anim. sans Vertebres. IV. 129. 



Mas. — Atrum, punctatum, pubescens, parum nitens : caput thoracis 

 latitudine : oculi et ocelli picei : antennae nigrae, pubescentes : 

 abdomen thorace multo longius ; segmenta scitissime sulcata, 

 apud suturas laeviora : sexualia picea : pedes nigri ; trochanters, 

 genua et tarsi picea ; protibiae apice et subtus rufa : alae fuscse ; 

 nervi obscuriores ; squamulae piceae. 



Fern. — Laevius, nitentius ; alae obscuriores. (Corp. long. lin. Is ; 

 alar. lin. 2i.) 



Very rare in England ; abundant in the Forest of Fontain- 

 bleau ; taken also in the south of France, and at Paris, by 

 the Comte de Castelneau. 



Art. XXXIII. — Of the Double Metamorphosis in Macro- 

 podia Phalangium, or Spider-Crab, with Proofs of the 

 Larvae being Zo'ea in Gegarcinus hydrodomus, Thelphusa 

 erythropus, Eriphia carribcea,and Grapsus pelagicns. By 

 J. V. Thompson, F. L. S., Deputy Inspector-General of 

 Hospitals. 



Having, in preceding memoirs, given an account of the 

 double metamorphosis in Carcinus* and Portunus, h and 

 brought forward proofs that the larva? of Cancer, of Pinno- 

 theres, - and of Porcellana, c are also Zo'ea, I have now to 

 furnish all the other data illustrative of the same fact which my 

 journal affords. 



The above-mentioned genera include several of the more 

 distinct and familiar types of the Br achy ur a, and those which 

 I now make known, embracing the triangular division and 

 several of the land-crabs, bring to a very satisfactory conclusion 

 this interesting point. 



1 Ina paper sent to the Royal Society last April. 



i, In the Entomological Magazine, Vol. III. p. 277. 



■ Zool. Res. pi. 8. d Ent. Mag. Vol. III. p. 85. 



" Ent. Mag. Vol. III. p. 27J. 



