320 PROCEEDINGS OF THE 



The male has one more joint in the antennae than the female ; 

 they are also testaceous beneath, and the abdomen has the dorsal 

 surface of the abdomen black. Length lf-2|- lines. 



This species is very variable in coloration, some specimens 

 having the head and abdomen almost all black. I have one male, 

 from Kenmuir bank on the Clyde, which is half the usual size ; 

 the wings are scarcely smoky, and the basal half of the femora and 

 the posterior tarsi black. I am in doubts whether it pertains to 

 vagans or to a new species. 



The larva mines the leaves of the common alder, in which it 

 lives alone, or a leaf may be inhabited by two or three larvae. 

 Two broods are met with, the autum.nal one being the most 

 numerous. The mines appear to be met with almost wherever 

 the food plant abounds. 



Phyllotoma microcephala. 



Empliytus microcephalus, Blattw,, No. 184; Hartig, Blattw. u. 

 Holzw., 255, 3. Phyllotoma microcephala, Kaltenbach, Pflanzen- 

 fiende, 581 ; Thomson, Hymen., Scand., i., 179, 4. P. melanopyga, 

 Healy, Ent., iv., 176-178. 



Black, shining; antennae 14 jointed, two basal joints dull white; 

 a line round the inner orbits of the eye, labrum, clypeus, some- 

 times the epistoma, mandibles at the base, and palpi, white or 

 yellowish-white. Thorax black ; pronotum and tegulae white. 

 Abdomen yellow luteous, apex more or less black ; sheath of saw 

 hairy, more or less projecting. Feet yellow luteous. Wings 

 smoky, apex almost hyaline. 



Male — Antennae 15 jointed, beneath testaceous ; sides of thorax 

 more or less yellowisli-white ; face with more of the white colour 

 than in the female, and dorsal surface of abdomen more or less 

 black. Length 2-2 1 lines. 



Microcephalus is easily known from vagans, by having the 

 antennae 14 jointed, with the base pale; the pronotum and tegulae 

 white ; the wings clearer at the apex than at the base ; and the 

 apex of the sheaths of the saw hairy, instead of bare ^s in the 

 other species. 



The larva mines the leaves of various willows, and is double- 

 brooded. It is generally distributed, and very common. 



I have had ready for some time a monograph of the British 

 species of Phcenusa, but have delayed the publication of it until 



