PTEROMALIDAE OF N.W. EUROPE 355 



Fore wing with a diffuse brown discal cloud which sometimes touches the 

 marginal vein, the latter about five times as long as broad 



PANDELUS Forster (p. 422) 



- Antennae with anelli more or less transverse ; clava not yellow. Pronotum 



and coxae usually dark, rarely more or less yellow. First tarsal segment 



of mid and hind tarsi almost always relatively shorter .... 8 



8 (7) Fore wing with postmarginal vein at least slightly shorter than the marginal 



vein, and at most slightly longer than the stigmal vein ; post-spiracular 

 sclerite, and dorsal surface of hind coxae, with some hairs ; notauli 

 incomplete. Clypeus mainly reticulate . METACOLUS Forster (p. 418) 



Fore wing with postmarginal vein nearly always at least slightly longer than, 

 rarely only as long as, the marginal vein ; postspiracular sclerite, and 

 dorsal surface of hind coxae, bare ; notauli complete or incomplete. 

 Clypeus, except in some Homoporus, radiately strigose . • . . . 9 



9 (8) Antennal clava acute or acuminate apically ; fore wing with a fuscous cloud 



below the marginal vein ; genae not sharp HOMOPORUS Thomson (p. 444) 

 Antennal clava not acute apically ; fore wing immaculate ; genae usually 



with a sharp edge .......... 10 



10 (9) Notauli complete, deep throughout ; gaster in dorsal view appearing clavate, 



its basal tergite narrow and nearly twice as long as broad ; speculum of 

 fore wing, on lower surface of wing, more or less effaced by scattered hairs ; 

 stigma moderately large ; anterior margin of clypeus angularly produced 



CORVNA Walker (p. 845) 

 Notauli either incomplete or, if complete, then superficial posteriorly ; 

 gaster not clavate, the basal tergite in dorsal view not longer than broad ; 

 speculum of fore wing not effaced ; stigma large or small ; clypeus often 

 otherwise ........... n 



11 (10) Mesopleuron entirely reticulate ; antennae inserted level with ventral edge 



of eyes ; pronotal collar not margined ; notauli sometimes complete. 

 Antennal formula 1 1 353 . . PACHYCREPOIDEUS Ashmead (p. 846) 



- Mesopleuron with a smooth shiny triangular area below the base of the hind- 



wing ; antennae inserted at least slightly above the level of the ventral 

 edge of the eyes ; pronotal collar nearly always margined ; notauli in- 

 complete. Antennal formula usually 11263 (11353 in some Pachyneuron) 12 



12 (11) Gaster dorsally usually more or less sunken, or flat, discally ; if somewhat 



convex, then the anterior margin of the clypeus is produced and bluntly 

 pointed medially .... PACHYNEURON Walker (p. 830) 



Gaster strongly convex dorsally. Anterior margin of clypeus emarginate 



medially, sometimes rather deeply so . . . . . . . 13 



13 (12) Apical margin of fore wing ciliate ; postmarginal vein fully 1-5 times as long 



as the stigmal vein EUNEURA Walker (p. 843) 



- Apical margin of fore wing bare ; postmarginal vein less than 1-5 times as 



long as the stigmal vein .... GYGAXIA Delucchi (p. 845) 



14 (6) Face just below level of antennal toruli with a conspicuous blunt crest on each 



side, the face below this strongly excavated ; a strong crest present be- 

 tween the toruli ; head massive, though only slightly broader than thorax, 

 with temples long ; pronotum large ; hind femora strongly swollen ; 

 antennal formula 11353 (Central Asia) NIKOLSKA YANA Boucek (p. 429) 



Face without crests below antennal toruli, at most weakly excavated. The 



other characters not all present in combination . . . . . 15 



15 (14) Notauli traceable, at least as a superficial line, as far as the hind margin of 



the mesoscutum, but often distinctly and quite deeply impressed through- 

 out 16 



