PTEROMALIDAE OF N.W. EUROPE 49 



With his kind permission I include here a transcript (very slightly altered) of his 

 key. The rest of my account is mainly a condensed version of the information 

 already given in Dr. Boucek's paper, the only original contributions being a few- 

 remarks on some of the synonymy. 



A detailed redescription of the genus is given by Boucek (1963 : 433), who also 

 synonymized Prospalangia Brethes with it. 



Key to Holarctic Species 



1 Pronotum with an isolated transverse line, composed of closely-set piliferous 



punctures, near its hind margin ; disc of collar more or less smooth and 

 impunctate at least down the middle ....... 2 



- Pronotum without any distinct isolated transverse line of piliferous punctures, 



though sometimes with a transverse impression in which the punctures are 

 deeper and denser than elsewhere . . . . . ' . . 7 



2 (1) Front edge of pronotal collar with a fine margin or ridge, best seen with the 



light coming from behind ......... 3 



- Front edge of pronotal collar rounded off ...... . 4 



3 (2) Surface of pronotal collar nearly flat between its front edge and the posterior 



transverse line of punctures. Females with all funicular segments of an- 

 tennae usually longer than broad, the distal segments rarely quadrate ; head 

 in frontal view about 1 -25 times as high as broad . nigroaenea Curtis (p. 52) 



- Surface of pronotal collar distinctly arched. Females with distal segments 



of antennal funicle subquadrate ; head in frontal view hardly i-i times as 



high as broad ....... slovaka Boucek (p. 52) 



4 (2) Antero-lateral parts of pronotal collar rugulose, or densely rugulosely punctate ; 



a discal triangle on the collar smooth, sometimes with a shallow longitudinal 

 groove ....... cameroni Perkins (p. 53) 



- Antero-lateral parts of pronotal collar punctate, with wide or narrow smooth 



interspaces between the punctures ....... 5 



5 (4) Pronotal collar very convex, its piliferous punctures sparse, separated by much 



more than their own diameter, and rather regularly distributed ; posterior 



transverse line of punctures often slightly angulate forwards in the middle. 



Distal funicular segments of female slightly transverse, of male quadrate 



enclius Walker (p. 53) 

 Pronotal collar less convex, its piliferous punctures closer together, at least 

 some of them separated by their own diameter or less, tending to be more 

 irregularly distributed ; posterior transverse line of punctures curved, not 

 angulate ............ 6 



6 (5) Head and pronotum with very dense puncturation, except sometimes a small 



triangular area on the disc of the pronotal collar; pronotum subpentagonal ; 

 body and wings very hairy ...... [see nigra, couplet 9] 



- Head and pronotum with less dense puncturation, some of the interspaces 



wider than the punctures ; pronotal collar appearing almost semicircular 

 in dorsal view, its sides strongly curved ; body and wings less hairy 



[see slovaka, couplet 3] 



7 (1) Pronotum, and head, very densely punctate or rugose-punctate, the inter- 



spaces much narrower than the punctures themselves, sometimes virtually 

 absent ............ 8 



- Pronotum sparsely punctate, with at least most of the interspaces as wide as 



or wider than the punctures themselves . . . . . . 10 



