PTEROMALIDAE OF N.W. EUROPE 405 



spiracular sclerite (Text-fig. 335) broader, relatively uniformly reticulate. 

 Marginal vein 1-65 to 1-85 times as long as the stigmal vein 



CHLOROCYTUS Graham (p. 611) 



- In exact dorsal view of thorax, the pronotal neck appears shorter than, or 



at most as long as, the collar, the latter often long medially, sometimes as 

 much as one fifth the length of the mesoscutum. Postspiracular sclerite 

 (Text-fig. 336) narrower, more weakly and irregularly reticulate. Mar- 

 ginal vein 1-35 to 1-7, but usually not more than 1-5 times as long as the 



stigmal vein HABROCYTUS Thomson (p. 494) 



x 37 (J34) Antennal scape as long as an eye . . . . . . . .138 



- Antennal scape somewhat, often much, shorter than an eye . . .139 

 I 3& (137) Antennal pedicellus, in dorsal view, about 1-5 times as long as broad. Head 



slightly protuberant immediately below antennal toruli, the face forming 

 an angle of about 45° with the frons. Spiracular sulci of- propodeum 

 shallow, not or hardly sculptured . DIRHICNUS Thomson (p. 787) 



- Antennal pedicellus in dorsal view appearing hardly longer than broad. 



Head not protuberant at level of toruli. Spiracular sulci of propodeum 

 distinctly impressed, more or less punctate or with transverse costulae 



HABROCYTUS Thomson (p. 494) 

 x 39 ( I 37) Marginal vein of fore wing 1 -i to 12 times as long as the stigmal vein ; body 

 bronze-black, legs mainly dark, antennae blackish ; both mandibles with 

 four teeth. First funicular segment at most slightly longer than the 

 pedicellus PEGOPVS Forster (p. 684) 



- Either the marginal vein is at least 1 -5 times as long as the stigmal vein ; 



or else the head and thorax are mainly green to blue-green, the tibiae and 

 tarsi are at least mainly yellowish, and the antennal flagellum is yellowish 

 beneath. Left mandible, or both mandibles, with three teeth . . 140 



140 (139) Marginal vein 1-2 to 1-3 times as long as the stigmal vein ; mesoscutum with 



several shallow piliferous punctures in addition to the reticulation, much 

 as in Text-fig. 316 ; pronotal neck sloping vertically with respect to the 

 surface of the collar, so that in an exact dorsal view of the thorax the neck 



is invisible CECIDOSTIBA Thomson (p. 564) 



Marginal vein 1-5 to 2 times as long as the stigmal vein. Mesoscutum 

 usually without piliferous punctures, if with a few then the pronotal neck 

 slopes less steeply and is visible in a dorsal view of the thorax . . 141 



141 (140) Propodeum (cf. Text-figs. 371-381) with plicae distinct throughout ; spiracu- 



lar sulci distinctly impressed, even just behind the spiracles, and with some 

 transverse costulae or punctures. Base of scutellum nearly as broad as 

 base of axilla. 



Mesosternal mesolcus subobsolete. Left mandible with three teeth, right 

 mandible with four .... HABROCYTUS Thomson (p. 494) 



Propodeal plicae usually absent, or subobsolete anteriorly (Text-figs. 492, 

 493) ; if distinct throughout, then the base of the scutellum is at most 

 half as broad as the base of an axilla. Spiracular sulci of propodeum 

 usually shallow, and without costulae or punctures . . . .142 



142 (141) Both mandibles with three teeth. Vertex usually (Text-figs. 437, 438, 440) 



with a transverse ridge behind the ocelli ; if lacking a ridge, then the 

 mesosternal mesolcus is a sharply-impressd line, and the head and thorax 

 are usually dark blue .... HOLCAEUS Thomson (p. 584) 



Left mandible with three teeth, right mandible with four. Vertex without a 

 transverse ridge. Head and thorax at least mainly bright green to blue. 

 Mesosternal mesolcus at most weakly impressed, sometimes obsolete 

 anteriorly ........... 143 



