34-4? Mr. J. Blackwairs Characters of some 



30. Ectroma, Westw. 



Encyrtum (pedibus) cum Theocolace (habitu) conjungens. Caput crassurrt 

 mandibulis 3-dentatis. Antennae inter partem inferjorem oculorum insertne, 

 fere corporis longitudine, sensim incrassatce, 9-articulatgc, articulo 3tio 

 2do minori, 9no 8vo haud majori. Thorax oblongo-quadratus collariacumi- 

 nato. Alae rudimentales. — Ectr.Julvesoens, Westw. Capite thoraceque pal* 

 lide fulvis, aeneo submicantibus, abdomine obscure testaceo metallico, 

 oculis et antennis nigris, his basi subtus, apiceque articuli terminali pallidis 

 pedibus fulvis, tarsorum apice nigro. Long. lin. §-. Coombe, Aug. 1833. 



31. Pteroptrix, Westw. 



Agonioncuro affinis. Corpus brevissimum, latum, depressum. Caput-trans- 

 versum oculis magnis pilosis. Antenn* 8-articulatae, articulis 2 et 3 aequali- 

 bus, 4to paullo minori, 5,6, 7 multo majoribus, 8vo, minutissimo. Thorax 

 fere quadratus. Scutellum magnum. Alae magnae, apice loiige pilosae, nervo 

 stigmaticali brevi angulum acutum formante. Abdomen sessile, brevissi- 

 mam, apice mucronatum. Tarsi 4-articulati. — Pier, dimidiatus, Westw. 

 Piceo-niger, scutello albido, antennis flavis, articulo 7mo obscuriori, alarum 

 dimidio basali fusco, pedibus pallidis, femoribus tibiisque basi fuscis. Long. 

 Corp. lin. ^. In quercu, Richmond Park, Aug. 1833. 



32. Coccopkagus, Westw. 



Agonioneuro affinis, differt antennis 8-articulatis, articulo 2do 3tio minori, 

 hoc et duobus sequentibus fere aequalibus, ultimis 3iis clavam, vix articulo 

 praecedenti crassiorem, formantibus. Tarsi 5-articulati ; nervus stigmaticalis 

 brevis apice conoideus. Habitat in Coccis. — Sp. 1. Entedon scutcllaris, 

 Dalm. Sw. Tr. 1 825. 365 *.— Sp. 2. Cocc. pulchellus, Westw. Pallide flavus, 

 oculis, thorace antice abdomineque nigris, antennarum flagello thoracisque 

 Jateribus obscurioribus, pedibus flavis, tarsorum apice fusco. Long. lin. §. 

 Exclusus e Cocc. aceris, Jun. 1833. — Sp. 3. Cocc. obscurus, Westw. Niger, 

 abdomine nitido, antennis fuscescentibus, pedibus sordide albidis, tarsorum 

 apice fusco, femoribus intermediis basi, posticis totis, tibiisque posticis basi 

 fuscis. Alarum nervo fusco. Long. lin. f . Habitat cum praecedenti. Sp. 4. 

 Entedon insidiator, Dalm. 1. c. 371. 



LVII. Characters of some undescribed Genera and Species of 

 Araneidae. By John Blackwall, Esq, F.L.S. tyc.f 



Tribe, Inequitel^, Latreille. 



Genus, Nerienc, 



Neriene bicolor* 



\ ™ihi. 



/^EPHALOTHORAX inversely heart-shaped, convex 

 ^-^ above, and glossy, with an indentation in the medial line 

 of the posterior region. Mandibles robust, conical, perpen- 



* Dal man observes upon this species, " Dubii facile generis, Entedoni 

 proximus, sed ad Encyrtum quoque accedere videtur," a remark which ap- 

 plies both to Coccophagi and Agonioncuri. Were, however, the latter genus 

 synonymous with Aphclinus, Dalman would doubtless, from the intimate 

 affinity of the two genera, have placed *!ttt. scutellaris with Aphclinus. The 

 number of joints in the antennae is also different in Agonioneurus and 

 Aphclinus. 



f Communicated by the Author. 



