PTEROMALIDAE OF N.W. EUROPE 443 



MERISUS Walker 



Merisus Walker, 1835 : 166. Type-species : M. splendidus Walker, by monotypy. 



Merisus Walker ; Forster, 1856 : 53, 58. 



Merisus Walker ; Thomson, 1878 : 6o, 62. 



Merisus Walker ; Ashmead, 1904 : 324. 



Merisus Walker ; Schmiedeknecht, 1909 : 362, 364 [ex parte]. 



Merisus Forster [sic] ; Kurdjumov, 191 3 : 3. 



Merisus Walker ; Delucchi, 1956a : 229-233. 



Merisus Walker ; Peck et al., 1964 : 47. 



Merisus Walker ; Boucek, 19655 : 22-23. 



Key to European Species 



(Females) 



1 Malar space one quarter length of an eye or hardly more. Antennae with combined 

 length of pedicellus and flagellum distinctly less than breadth of head ; funicular 

 segments relatively short, the first subquadrate, fourth to sixth slightly transverse ; 

 clava slightly longer than funicular segments five plus six, acuminate apically, its 

 sutures indistinct. Ocelli large, the hind ones distinctly less than twice their own 

 major diameter from the eyes ..... splendidus Walker (p. 443) 



- Malar space about one third length of an eye. Antennae with combined length of 



pedicellus and flagellum hardly less than breadth of head ; funicular segments 

 relatively longer, the first slightly longer than broad, sixth quadrate ; clava about as 

 long as funicular segments five plus six, blunter apically, its sutures more distinct. 

 Ocelli smaller, the hind ones more than twice their own major diameter from the 

 eyes .......... flagellatus BouCek (p. 444) 



(Males) 



1 Antennae with combined length of pedicellus and flagellum about 1-3 times breadth 

 of head ; scape much longer than first funicular segment, the latter slightly less than 

 twice as long as broad ; remaining funicular segments less than twice as long as 

 broad, the sixth quadrate or only slightly longer than broad splendidus Walker (p. 443) 



- Antennae with combined length of pedicellus and flagellum about twice breadth of 



head ; scape about as long as first funicular segment ; the latter nearly 2 -5 times as 

 long as broad ; remaining funicular segments about twice as long as broad 



flagellatus Boudek (p. 444) 



Merisus splendidus Walker 

 (Text-fig. 300) 



Merisus splendidus Walker, 1835 : 167, $. 



Merisus splendidus Walker ; Haliday, 1841-1842 : v, pi. A, fig. 1, $. 



Merisus acutangulus Thomson, 1878 : 64, $. 



Merisus splendidus Walker ; Delucchi, 1956a : 231-233, o" ?• 



Type material. Merisus splendidus Walker. Type not yet found. Delucchi 

 (1956a : 233) erected a neotype from Varinella, Val Scrivia, Italy, collected between 

 July and September, 1927 (Mancini). Probably the type was loaned to Haliday 

 for the purpose of his figure (1842) and might not have been returned to Walker. 



Merisus acutangulus Thomson. Syntypes, 2 $. LECTOTYPE labelled " Hg " 

 [Halsingborg] on a pale green label. Thomson's acutangulus was treated as a 



