. Bulletin of the British Museum (Natural History) Entom Supp. 13° MORPHOLOGY AND TAXONOMY OF ADULT MALES to width 1-3-1-4 (1-38) : 1, and the ratio its length to the total body length 1 : 10-2-12-0 (n-o). Basal ridge of penial sheath and its projection well developed ; process of penial sheath well pronounced. Aedeagus gradually pointed. Setae of genital segment : Dorsally, 3 setae always present on each side near the base of the style ; ventrally 3-4 (3-7) setae occur on each side of the penial sheath, and 4-5 (4-3) setal sensilla on its process. Material : 10 specimens examined, collected b
. Bulletin of the British Museum (Natural History) Entom Supp. 13° MORPHOLOGY AND TAXONOMY OF ADULT MALES to width 1-3-1-4 (1-38) : 1, and the ratio its length to the total body length 1 : 10-2-12-0 (n-o). Basal ridge of penial sheath and its projection well developed ; process of penial sheath well pronounced. Aedeagus gradually pointed. Setae of genital segment : Dorsally, 3 setae always present on each side near the base of the style ; ventrally 3-4 (3-7) setae occur on each side of the penial sheath, and 4-5 (4-3) setal sensilla on its process. Material : 10 specimens examined, collected by myself, on beech trees (Fagus sylvatica), in the Imperial College Field Station, Silwood Park, Sunninghill, Berk- shire, England, Remarks : Although the present study is mainly concerned with morphology and taxonomy, some biological observations were also made. According to Blaire (1958), the second stage larvae of this species, usually males, migrate from the small twigs towards the main branches and trunk of the trees between February 12th and April 10th ; however, the writer was able to produce adult males from larvae collected during the last two weeks of April. It was found that the second stage larvae take about 48 hours to reach the third stage, and the latter about another 48 hours to become prepupae ; the prepupae take about 7 days to develop to pupae, and the pupae about 8-10 days to produce males with well developed antennae, legs and wings, but still in a stationary condition or with very limited movement. The males became active after about 48 hours, after which the long waxy tassels covering the abdominal segment VIII were produced ; they were then ready to emerge from their puparia and search for the females. The males mated 5-10 times with females introduced to them in the same glass tube ; each copulation usually lasts 1^—3 minutes and may be repeated with the same female or another one at variable intervals from several minutes to a few hours
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