DUBLIN UNIVERSITY ZOOLOGICAL AND BOTANICAL ASSOCIATION. 171 



Subgenus 2. Diapeia Latr. 



Antennae maris articulis 14, quarto tuberculato; feminae articulis 

 12. Alae vena simplici capitata. Abdominis segmentum secundum 

 laeve. Metathorax subtruncatus. 



Sectio 1. Abdominis segmentum secundum basi incisum. 

 Biapria cornea Fb., femina, — mas, B. rufipes Latr., — B. spectabilis 

 Nees, — D.filicornis H.-Schaeffer. 



Sectio 2. Abdominis segmentum secundum basi integerrima. 

 Biapria verticillata Latr., — Psilus elegans Jurine ; B. nigra Wees, — 

 conica Spinola ; B. fucicola Walker, — parvula Nees ; B. picipes Nees ; 

 B. perelegans Curtis, — suspecta Nees, etc. ; in all about a dozen British 

 species of this section. 



Subgenus 3. Basalts Wwd., — Rhacodia Herrich-Schaeffer. 



Antennae maris articulis 14, quarto inaequali; feminae 12, capitatae. 

 Vena quasi unica exiens in punctum stigmaticale appendiculatum, 

 venulae recurrentis vestigio ante apicem aucta. Abdominis segmentum 

 secundum basi aequatum. Metathorax postice excavatus. 



Six British species, including Basalys fumipennis "Wwd., — Biapria 

 striolata Nees, — Rhacodia id. H.-Schaeffer; B. dispar~Nee&, femina tan- 

 tum, Psilus antennatus Jurine ? — mas, Rhacodia picipes H.-Schaeffer; 

 Biapria rufiscapa Nees, — Rhacodia id. H.-Schaeffer. 



Subgenus 4. Spilomiceus Wwd., — Chlidonia spp. H.-Schaeffer. 

 Antennae 13-articulatae ; maris articulo tertio secundum plus duplo 

 superante. Vena subcostalis concurrens cum costali in punctum stig- 

 maticale appendiculatum. Abdominis segmentum secundum laeve, su- 

 perne retroproductum, petioli apicem imbricatim obtegens. 



Spilomicrus stigmaticalis Wwd., — femina, Chlidonia varipes H.- 

 Schaeffer ; in this species and B. proeera, the costal vein is tolerably 

 distinct ; but fainter in the remaining four or five British species, as 

 Chlidonia radialis and obtusa H.-Schaeffer. 



Subgenus 5. Paramesius Wwd., — Chlidonia spp. H.-Schaeffer. 

 Antennae 13-articulatae; maris articulis secundo et tertio minutis. 

 Vena subcostalis cum costali concurrens in lineolam stigmaticalem cum 

 ramulo radiali brevissimo. Abdominis segmentum secundum laeve, basi 

 supera et infera contermina. 



Antennae feminae subclavatae, articulo ultimo penultimum superante. Mesonoti scu- 

 tum bisulcum ; scutelli fovea in fundo crenata. Abdomen feminae apice acuminatum. 



Paramesius rufipes Wwd., — Biapria nervosa Nees, — mas, Chlidonia 

 id., — femina, CM. acuminata H.-Schaeffer, a species that varies greatly in 

 size and in the colour of the limbs. 



