NATURAL HISTORY SOCIETY OF GL.ASGO^V. 315 



the male insect — the only sex kno\Yn to him) wouhl certainly 

 give one the impression that xanthogaster was distinct from our 

 insect, more particularly as he states that the abdomen is of a 

 j-ellow colour. 



A Monographic revision of the British species of Phyllotoma. 



A good deal of confusion having been introduced into the 

 nomenclature of the British PhyUotomce, I have thought that a 

 monographic revision of our species might be useful, more especially 

 as they have never been properly described in this country. 



Phyllotonui is distinguished by having the antennre 10-15 jointed ; 

 the eyes not touching the base of the mandibles ; the anterior 

 wiuizs with 2 marginal and 3 sub-marginal cellules, the first and 

 second of the latter receiving each a recurrent nervure ; and the 

 tarsi devoid of patella?. With Phaniusa, Fenella, and Ccenoneura,^ 

 it forms a very natural group, not so much remarkable for 

 similarity of structure, as for the close agreement they evince in 

 the habits, form, and coloration of their larvc^. The following 

 table will differentiate these four ii;enera : — 



Section i. — Antennae 10-15 jointed: 



Eves not touchiusr the base of the mandibles ; lanceolate cellule 

 open — Phi/Uotoma. 



Eyes touching the base of the mandibles; lanceolate cellule petiolate — 

 Pcndla. 



Section ii. — Antenna; 7-9 jointed: 



Antennae 7-8 jointed; lanceolate cellvde open — Coenoneura. 



Antennae 9 jointed (? sometimes 10 jointed); lanceolate cellule petiolate 

 — Plicenusa. 



I have not yet been able to discover any characters whereby the 

 larv« of the various species of Phyllotoma may be recognised from 

 each other, so alike are they in form and coloration, and the 

 difficulty of doing so is increased by the fact that the markings ou 

 the same species vary more or less.t The following description 

 will therefore apply to all the species : — 



The form of the larva is depressed, fiattish, broader before than 

 behind ; the head small, sharpl^'-poiuted in front, triangular, and 



* We do not yet know the habits of Coenoneura, but it is highly possible that 

 it is also a leaf miner. 



+ All, however, affect different food-plants, and this is the best way to 

 distinguish them. 



