PTEROMALIDAE OF N.W. EUROPE 749 



(European species, not definitely known to occur in North America) . . 42 



42 (41) Lower edge of antennal toruli about at level of ventral edge of eyes. Head 

 in dorsal view (Text-fig. 627) with temples about one third as long as the 

 eyes. Malar space from three fifths to two thirds the length of an eye. 

 Head and thorax bronze- or bluish black ; legs very dark, the femora 

 mainly, the tibiae usually more or less, infuscate. Species associated with 

 Fucus on the sea-shore ..... fucicola (Walker) (p. 753) 



Lower edge of antennal toruli distinctly above the level of ventral edge of 

 eyes. Head in dorsal view (Text-fig. 628) with temples one fifth to one 

 quarter as long as the eyes. Malar space 0-35-0-4 the length of an eye. 

 Head and thorax green to blue or greenish bronze ; legs apart from coxae 

 often wholly testaceous, the femora sometimes infuscate. Species not 

 associated with Fucus ..... hemipterus (Walker) (p. 771) 



Key to most European Males 



Note. The unknown male of pompilicola sp. n. may be expected to differ from those of all 

 the other European species in having an extensively pilose basal cell in the fore wing, combined 

 with quadridentate mandibles. 



1 Brachypterous forms .......... 2 



Macropterous forms .......... 4 



2 (1) Species associated with seaweed (Fucus). Lower edge of antennal toruli 



hardly above level of ventral edge of eyes. Head and thorax bronze- or 

 bluish black ; legs reddish with the femora often, the tibiae sometimes, 

 infuscate medially. Both mandibles with 4 teeth . fucicola (Walker) (p. 753) 

 Species not associated with Fucus. Lower edge of antennal toruli distinctly 

 above level of ventral edge of eye. Head and thorax bronze-green, green, 

 or blue ; legs, not counting coxae, testaceous to yellowish, sometimes with 

 the femora slightly infuscate. Left mandible with 3 teeth, right mandible 

 with 4 ........... . 3 



3 (2) Head in dorsal view (Text-fig. 641) 1-9-2 times as broad as long 



hemipterus (Walker) (p. 771) 

 Head in dorsal view (Text-fig. 642) 2-05-2-1 times as broad as long 



micropterus (Lindeman) (p. 766) 



4 (1) Fore wing with marginal vein twice as long as the stigmal vein ... 5 

 - Fore wing with marginal vein at most 1-7 times as long as the stigmal vein . 7 



5 (4) Thorax twice as long as broad. Antenna (Text-fig. 638) with combined 



length of pedicellus and fiagellum about 125 times the breadth of the head ; 

 scape as long as an eye and reaching slightly above the vertex. Head and 

 thorax green ; legs except coxae yellowish . . scaposus sp. n. (p. 774) 



Thorax somewhat less than twice as long as broad. Combined length of 

 pedicellus and fiagellum not or hardly greater than breadth of head. 

 Either the head and thorax are bronze- to bluish black ; or the antennal 

 scape is slightly shorter than an eye ....... 6 



6 (5) Head and thorax bright green ; legs except coxae testaceous. Left mandible 



with 3 teeth, right mandible with 4. Species not associated with seaweed 



sp. indet. G (p. 774) 

 Head and thorax bronze- or bluish black ; legs reddish with the femora often, 

 the tibiae sometimes, partly infuscate. Both mandibles with 4 teeth. 

 Species associated with seaweed (Fucus) . . fucicola (Walker) (p. 753) 



