370 METAMORPHOSIS 



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

 Oxyurus frontalis . Lam, Anhn. sans Vertebres. IV. 129. 



Bias. — 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 ; trochanteres, 

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

 nervi obscuriores ; squamulae piceae. 



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

 alar. lin. 2^.) 



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 MetamorpJiosis in Macro- 

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

 LarvcB being Zoea in Gegarcinus hydrodomus, Thelphusa 

 erythropus, Eriphia carribaa,and Grajysus pelagicus. By 

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

 Hospitals. 



Having, in preceding memoirs, given an account of the 

 double metamorphosis in Carcinus^ and Portunus^ and 

 brought forward proofs that the larvae of Cancer,'^ of Pinno- 

 theres,'^ and of Porcellana," are also Zota, I have now to 

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

 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. 



a In a paper sent to the Royal Society last April. 



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



" Zool. Res. pi. 8. ^ Ent. Mag. Vol. III. p. 85. 



• Ent. Mag. Vol. III. p. 275. 



