PTEROMALIDAE OF N.W. EUROPE 411 



Dinotus clypealis Thomson. Syntypes examined by the writer, but no lectotype 

 has yet been selected. 



Britain, Sweden, Germany, Central Europe. 



Biology. Parasitic on several species of Scolytidae, e.g., Polygraphia sp., Phthoro- 

 phloeus spintdosus Rey, Cryphalus spp., Pityophthorus spp., Pityogenes sp., Dryo- 

 coetes autographus Ratz. (see Hedqvist, 1963 : 92-93). Stewart's record of the 

 rearing of Etroxys dimidiatus Walker from Pityogenes bidentatus Herbst in Scotland 

 (1923 : 138) probably refers to Dinotiscus eupterus (Walker). Imagines most often 

 in June and Aug.-Sept. (apparently 2 generations in some areas). 



Dinotiscus aponius (Walker) 



Hetroxys Aponius Walker, 1848 : 127, 215, $ $. 



Pteromalus capitatus Ratzeburg, 1848 : 196, pi. 3, fig. 7, 6* 9 [? riec Forster, 1841]. 



Dinotus bidentulus Thomson, 1878 : 39, o* 9- 



Dinotus capitatus (Ratzeburg) Kurdjumov, 1913 : 10. 



Dinotiscus bidentulus (Thomson) Ferriere, 1948 : 525-526, 0* 9- 



Dinotiscus aponius (Walker) Hedqvist, 1963 : 84, 85-87, 0" $. 



Type material. Hetroxys aponius Walker. Syntypes, 1^,1$. LECTOTYPE, 

 the male specimen, bearing a Waterhouse label. 



Pteromalus capitatus Ratzeburg. Types presumed destroyed. Ratzeburg's 

 figure of the fore wing (1848, pi. 3, fig. 7) agrees best with that of aponius (Walker). 

 The species was transferred to Dinotus by Kurdjumov (1913 : 10). 



Dinotus bidentulus Thomson. Syntypes examined by the writer, but no lectotype 

 yet selected. 



North-west (including Britain) and Central Europe. 



Biology. Parasite of Scolytus rugulosus Ratz., S. multistriatus Marsh., 5. ratzeburgi 

 Jans., Hylesinus fraxini Pz. (see Hedqvist, 1963 : 86-87). Imagines May- 

 September (possibly more than one brood). 



The species varies considerably in size. 



Dinotiscus colon (Linnaeus) comb. n. 



Sphex colon Linnaeus, 1758 : 571. 



Sphex colon Linnaeus, 1761 : 413. 



Dinotus calcaratus Thomson, 1878 : 40, $, syn. n. 



Dinotiscus calcaratus (Thomson) Ferriere, 1948 : 525, 526, $ 9- 



Dinotiscus calcaratus (Thomson) ; Hedqvist, 1963 : 84, 87-90, q" 9- 



Type material. Sphex colon Linnaeus. In the Linnean collection (The Linnean 

 Society, London) there is a pinned specimen labelled " colon ". It agrees well 

 enough with the original description (and also with the rather more detailed one by 

 Linnaeus, 1761) and is designated LECTOTYPE. Contrary to all expectation, it 

 is a ^ of Dinotiscus calcaratus (Thomson). Walker (1848 : 127) incorrectly 

 synonymized Diplolepis [= Cheiropachus] quadrum Fabricius with Sphex colon, 



