PTEROMALIDAE OF N.W. EUROPE 247 



MICRADELINI 

 MICRADELUS Walker 

 Micradelus Walker, 1834 : 170. Type-species : M. rolundus Walker, by monotypy. 



Micradelus Walker 

 Micradelus Walker 

 Micradelus Walker 

 Micradelus Walker 

 Micradelus Walker 

 Micradelus Walker 

 Micradelus Walker 

 Micradelus Walker 



Forster, 1856 : 60, 61. 

 Thomson, 1878 : 6-7. 

 Ashmead, 1904 : 283, 284. 

 Schmiedeknecht, 1909 : 155, 156, 159-160. 

 Nikol'skaya, 1952 : 209-210. 

 Kerrich & Graham, 1957 : 271-275. 

 Ferriere & Kerrich, 1958 : 22, 25. 

 Boucek, 1 96 1 : 62-63. 



This genus was recognized and redescribed by Thomson (1878) as a Cleonymid, but 

 hardly noticed subsequently until its characters were re-assessed by Kerrich & 

 Graham (1957), who objectively defined the type-species. In the latter paper 

 Graham (pp. 271-272) followed Thomson's suggestion that it might be related to 

 the Tridymine group and proposed to form for it a subfamily Micradelinae. In the 

 present work the above placing is retained but the group is considered to have only 

 tribal status. 



Two European species were recognized by Kerrich & Graham (1957). One of 

 these (obscurus Thomson) is now regarded as a probable synonym of rotundus ; but 

 a new species is described in the present work. 



Key to European Species 

 (Females) 

 1 Gaster short-oval or subcircular, i-i to 1-5 times as long as broad, apically, not 

 counting the ovipositor sheaths, subobtuse ; last tergite subtrapeziform, its hind 

 margin truncate or slightly emarginate. Antenna (Text-fig. 187) with two anelli 

 and five funicular segments. Length 1-2 to i-6 mm. Head in dorsal view 2-05 to 

 2-2 times as broad as long ; temples one quarter as long as eyes or slightly more 



rotundus Walker (p. 247) 



- Gaster long-ovate, 1 -7 to 2-1 times as long as broad, apically acute or slightly acumin- 



ate ; last tergite triangular. Antenna (Text-fig. 188) with three anelli and four 

 funicular segments. Length 0-9 to 1-2 mm. Head in dorsal view 1-95 to 2 times 

 as broad as long ; temples about one third as long as eyes . acutus sp. n. (p. 249) 



(Males) 

 1 Length 1-2 to i*8 mm. Head in dorsal view rather more transverse (as in female). 



Antennae with two anelli and five funicular segments . rotundus Walker (p. 247) 



- Length 0-9 to i-i mm. Head in dorsal view rather less transverse (as in female). 



Antennae usually with three anelli and four funicular segments, occasionally with 



two anelli and five funicular segments ..... acutus sp. n. (p. 249) 



Micradelus rotundus Walker 



Micradelus rotundus Walker, 1834 : 170, <$ $. 



? Micradelus obscurus Thomson, 1878 : 6-7, o* <j>. 



Micradelus rotundus Walker ; Kerrich & Graham, 1957 : 273-275, pi. 1, $ $. 



Micradelus rotundus Walker ; Ferriere & Kerrich, 1958 : 25. 



Micradelus rotundus Walker ; Boucek, 1961 : 62-63, [ex parte]. 



Type material. Micradelus rotundus Walker. Lectotype <$ in Hope Dept., 



