824 Prof. Westwood on the supposed abnormal 



pupae of the Isosoma, with the pellets of excrement dis- 

 charged by the larvae before their transformation to that 

 state ; one of the pupae seen laterally is represented in 

 fig. 14, highly magnified. 



Fig. 10 represents a Cattlcyia bud cut open at the base, 

 showing three of the larvae of the Isosoma ; whilst fig. 9 

 represents another Cattleyia bud cut open, showing six of 

 the pupae. The larva itself is represented in fig. 11. 

 It is considerably more swollen than that of /. tritici, as 

 figured by Mr. Riley, the sides of the body showing the 

 swollen portions, which are capable of greater or less 

 dilatation. The figure of this larva will be seen closely 

 to resemble that oi Blastophaga Psenes, figured in Plate iv., 

 fig. 26. 



Fig. 12 represents the head of the larvae seen laterally 

 and rather obliquely, with the two minute antennae each 

 arising from a dilated fleshy base ; and fig. 13 represents 

 the front view of the head, with the two bidentate man- 

 dibles and two swollen lateral parts, which probably 

 represent the maxillae. 



Plate xiv., fig. 18, represents the larva oi Isosoma tritici, 

 copied from Prof. Piiley's figure. 



Mr. T. Whitmarsh, of Wilton, near Salisbury, has paid 

 much attention to the Cynipidce, having reared a large 

 number of the species, and has been so good as to furnish 

 me with a number of microscopical preparations of them. 

 Amongst them are specimens of both sexes of a species 

 of Isosoma which he reared from swellings on grass 

 (some with and some without holes in them), gathered in 

 1873, from which the Isosomce were produced in the 

 latter part of June and beginning of July in the following 

 year. The antennae in the male specimens thus obtained 

 are long, considerably pilose, with the 2nd joint short 

 (scarcely longer than thick), followed by a minute an- 

 nulus, and this by seven distinct joints, which gradually 

 become rather more slender and shorter towards the end 

 of the antennae ; the extremity of each of these joints is 

 strangulated, and the terminal joint is quite entire, 

 longer and more slender than the preceding joint, with 

 the tip pointed. The female antennae have the seven 

 terminal joints also quite distinct and but very slightly 

 thickened towards the tip of the antennae, without any 

 distinct subarticulation visible in the terminal joints. 

 The clypeus in the female is produced in the centre, and 

 slightly furcate. 



