PTEROMALIDAE OF N.W. EUROPE 395 



57 (56) Occiput finely to very strongly margined, at least medially. Notauli usually 



quite sharply impressed to about halfway across the mesoscutum . . 58 



Occiput not margined. Notauli usually less sharply impressed ... 61 



58 (57) Transverse ridge separating occiput from vertex situated only slightly 



behind the ocelli, separated from them by hardly their own diameter. 

 Propodeal nucha not developed, but represented merely by a ridge or 

 narrow, weakly-sculptured transverse strip . HOLCAEUS Thomson (p. 584) 



- Transverse carina separating occiput from vertex situated farther back, and 



separated from the posterior ocelli by more than their own diameter. 

 Propodeum with a reticulate nucha which occupies at least about a third of 

 the median length of the sclerite ....... 59 



59 (58) Fore wing almost wholly pilose, the speculum absent or very small 



UROLEPIS Walker (p. 780) 



- Fore wing with a large speculum ; basal cell at least partly bare . . 60 



60 (59) Hind coxae hairy dorsally in their basal half 



GYRINOPHAGUS Ruschka (p. 777) 



- Hind coxae bare dorsally, at least in their basal half 



EUPTEROMALUS Kurdjumov (p. 737) 



61 (57) Hind coxae hairy dorsally in their proximal half or more .... 62 



- Hind coxae bare dorsally in their proximal half at least .... 69 



62 (61) Clypeus mainly to entirely reticulate, its anterior margin usually incised. 



Propodeal nucha not developed. Pronotal collar often immarginate . 63 



Clypeus mainly to entirely strigose, its anterior margin at most moderately 

 deeply emarginate. Propodeal nucha usually developed, sometimes large. 

 Pronotal collar usually margined ....... 66 



63 (62) Hind tibia with two distinct spurs. Pronotal collar rounded off in front. 



Fore wing with marginal vein usually shorter than, sometimes as long as, 

 the stigmal vein, no fuscous cloud around the latter. Anterior margin of 

 clypeus with two rounded lobes separated by a moderately deep incision 



CAENOCREPIS Thomson (p. 429) 

 Hind tibia with only one spur. Pronotal collar sometimes margined. Fore 

 wing with marginal vein sometimes longer than the stigmal vein, some- 

 times with a fuscous cloud around the latter. Anterior margin of clypeus 

 either with two pointed teeth, or subtruncate ..... 64 



64 (63) Face below level of antennal toruli, and clypeus with several conspicuous 



piliferous punctures amongst the reticulation. Anterior margin of 

 clypeus not, or only very shallowly, emarginate. Pronotal collar rounded 

 off in front ROPTROCERUS Ratzeburg (p. 423) 



- Face and clypeus often without obvious piliferous punctures ; if with 



some, then either the anterior margin of the clypeus is incised medially, or 



the pronotal collar is margined ........ 65 



65 (64) Pronotal collar margined. Fore wing usually with a speculum 



DINOTISCUS Ghesquiere (p. 409) 

 Pronotal collar not margined. Speculum of fore wing sometimes absent or 



rudimentary RHOPALICUS Forster (p. 412) 



66 (62) Scutello-axillar sutures curving anteriorly and meeting ; the scutellum there- 



fore touches the mesoscutum only at a point, or has only a very narrow 

 base. Propodeal callus not densely hairy ; sides of basal tergite of 

 gaster nearly bare. Left mandible with three teeth, right mandible with 

 four. Funicular segments of antenna all longer than broad, the first much 

 longer than the pedicellus .... APELIOMA Delucchi (p. 582) 



- Scutello-axillar sutures converging less strongly in front ; the base of the 



scutellum at least slightly more than half the maximum breadth of an 



