50 Mr. F. Walker on the Mymaridse. 



Generum Characteres. 



Ooctonus. Tarsi pentameri, antennas mari 13-, fern. 1 I-articulatas : 

 abdomen petiolatum : alas anticas vena trientali. 



Lymcenon (Ooctonus, sect. ii. olim). Tarsi pentameri : antenna? 

 mari 13-, fern. 11-articulatas : abdomen subsessile : alas anticas vena 

 tenuissima dimidiante. 



Arescon (Litus, sp. olim). Tarsi pentameri : antennas mari 13-, 

 fem. 8-articulatas : abdomen subsessile : alas anticas vena tenuissima 

 dimidiante. 



Litus. Tarsi pentameri : antennas fem. 9-articulatas : abdomen 

 sessile, segmento fere unico amplissimo : alas angustissimas longissimas. 



Alaptus. Tarsi pentameri : antennas fem. 8-, mari 10- articulatas: 

 abdomen sessile segmentis subasqualibus : alas angustissimas lon- 

 gissimas. 



Anagrus. Tarsi tetrameri : antennas mari 13-, fem. 9-articulatas : 

 abdomen sessile, fem. acuminatum : alas angustas. 



Anaphes. Tarsi tetrameri: antennas mari 12-, fem. 9-articulatas : 

 abdomen subsessile ovatum. 



Panthus. Tarsi tetrameri : antennas mari 13-, fem. 9-articulatas : 

 abdomen subsessile*. 



Caraphractus . Tarsi tetrameri : antennas fem. 9-articulatas scapo 

 fusiformi : abdomen petiolatum segmento 2° amplissimo : alas anticas 

 ulna lineari. 



Polynema. Tarsi tetrameri: antennas fem. 9-articulatas, mari 13- 

 articulatas scapo dilatato compresso : abdomen petiolatum : alas 

 anticas vena brevissima capitata. 



Mymar. Tarsi tetrameri: antennas mari 13-, fem. 9-articulatas 

 scapo gracili caput exsuperante : abdomen petiolatum : alas anticas 

 petiolatas, posticas setaceas abortivas. 



Eustochus. Tarsi tetrameri : antennas fem. 10-articulatas capitulo 

 biarticulato : abdomen petiolatum : alas anticas ulna lineari. 



Ooctonus. 



1. insignis. Fem. antennarum capitulo oblongo : J lin. 



2. vulgatus. Fem. antennarum capitulo ovato : alis completis, 

 abdomine nigro : \ lin. 



3. notatus. Fem. ut antea: abdomine rufo-piceo apice nigro: i lin. 



4. hemipterus. Fem. ut antea : alis abbreviatis : \ lin. 



All these species are found in England and Ireland : 0. notatus and 

 0. hemipterus are perhaps only varieties of 0. vulgatus. 



There are two other genera which are connected with the Myma- 

 ridce, but Mr. Haliday thinks that they are more nearly allied to the 

 Chalcidites. These genera, Dipara and Thysanus, are described, the 

 one in the ' Ent. Magazine' (i. 373, ii. 126), the other in the 

 ■ Annals of Nat. Hist.' (iv. 234). I am indebted to Mr. Haliday for 

 the following remarks on Dipara, which has filiform palpi. It " differs 

 from Sphecomicrus by the more oblate head, with two impressions 

 above the antennas, but not with the characteristic transverse line 



* Species sub hoc genus congestas vix satis congruunt, charactere arti- 

 ficial i. 



