Key to the British Drilidae & Lampyridae
For more information on LAMPYRIDAE click HERE.
1.
Head prognathous and visible beyond the pronotum. Without luminous organs. [Female pronotum transverse and only slightly narrower than the mesonotum.] Male 7-8mm. Female 20-25mm.
Head concealed beneath expanded anterior pronotal margin.
2.
Elytra entire, covering the abdomen.
Elytra reduced or absent.
Form narrower. Pronotum only obscurely, if at all, translucent. 10-12 mm.
Form broader. Pronotum with 2 distinct translucent windows from near the anterior margin. 8-10mm.
3.
4.
Elytra reduced.
Elytra absent.
5.
Pronotum with 2 distinct translucent windows. Antennae narrower, filiform. 9-11mm.
Pronotum without translucent windows. Antennae broader, segments quadrate or weakly transverse. 6-8mm.
6.
Larger >12mm. Antennomeres elongate.
Smaller <10mm Antennomeres transverse.