. The Entomologist's record and journal of variation. r, respec-tively grey or yellowish. Genital structure suggested that twospecies were involved but Lundstrom considered his materialinsufficient to establish this. Some recently collected British and Irish Pseudexechiadiffering externally from trisignata by the yellow thoracic * Weston Research Laboratories, 644 Bath Road, Taplow, Maidenhead,Berks. NOTES ON THE HOLARCTIC SPECIES OF PSEUDEXECHIA 45 ground colour, more extensive yellow abdominal markingsand shorter antennae, correspond better to Lundstromsfigures than does trisignata. These ar
. The Entomologist's record and journal of variation. r, respec-tively grey or yellowish. Genital structure suggested that twospecies were involved but Lundstrom considered his materialinsufficient to establish this. Some recently collected British and Irish Pseudexechiadiffering externally from trisignata by the yellow thoracic * Weston Research Laboratories, 644 Bath Road, Taplow, Maidenhead,Berks. NOTES ON THE HOLARCTIC SPECIES OF PSEUDEXECHIA 45 ground colour, more extensive yellow abdominal markingsand shorter antennae, correspond better to Lundstromsfigures than does trisignata. These are described here as anew species which may have a northern and western distribu-tion in the British Isles; it is the only Pseudexechia yet knownfrom Ireland, although it is probable that the two widespreadspecies also occur there. Pseudexechia aurivernica sp. n. Exechia trivittata (Staeger), pale form: Lundstrom, 1909 nee Staeger, 1840.$ 2 Body length a little over 4 mm.; wing length mm. Head dark grey; mouth-parts pale yellow. Antennae with. Figs. 1-4. Male genitalia of British Pseudexechia: fig. 1, ventral viewof male hypopygium of P. aurivernica sp. n.; figs. 2-4, internal faceof left claspers: 2, aurivernica; 3, P. trisignata (Edwards); 4, (Staeger). 46 entomologists record, vol. 90 15/11/78 scape, pedicel and more than half of first flagellar segmentpale yellow, rest of flagellum grey; flagellar segments nearlytwice as long as broad. Mesoscutum dull yellow with three dark brown stripes, themedian broadening to fore margin, faintly bifurcate in front;the laterals abbreviated to leave broad yellow shoulders,narrowed behind to enclose attenuated tip of median butnot reaching scutellum, which is yellow. Pronotum and pro-pleura yellow, pleura otherwise mainly grey dusted on a paleground. Halteres and legs entirely pale yellow. Disc of mesoscutum devoid of strong bristles but denselyclothed with golden yellow hairs. Strong black bristles conspi-cuous on fore
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