( xlviii ) 



LiiiD., fouud by himself on old beech-trees at Moncayo, North 

 Spain, in July last. 



Mr. A. J. Chitty exhibited a larva of Drihis flavescens, 

 taken by Mr. Pencott, the schoolmaster of Eastling, Kent, 

 near the school buildings. 



Dr. T. A. Chapman exhibited an album containing several 

 series of photographs of the development of the embryo within 

 the eg^ of Psammotis hyaUnalis, taken in 1901-2 by Mr. 

 W. II. Hammond of Canterbury, and Mr. W. R. Jeffrey. The 

 depth of focus obtained, and the consequent amount of detail 

 exhibited in the photographs was remarkable. 



Col. J. W. Yerbury exhibited (1.) 4 $ $ of Gastrophilus 

 nasalis, Linn., taken at Torcross, Devonshire, from the 19th 

 to the 31st of August last. He said that as this rai^e species 

 differed in a marked degree in its mode of flight, etc., fi'om the 

 common Horse Bot-fly, Gastrophilus equi, it would be as well 

 to draw attention to these differences. Gasti'ophihcs equi 

 when flying round a horse visits as a rule the belly antl the 

 fore legs. The $ carries her ovipositor almost horizontal, 

 and she looks when on the wing like the lower two-thirds of 

 the letter Z (/.). G. nasalis, on the other hand, carries the 

 ovipositor tucked under the belly and almost parallel to 

 the axis of tlie body, this gives her when on the wing a 

 peculiar ball-like appearance ; G. nasalis too always flies to 

 the horse's head. While at Torcross during August and 

 September 20 Bot-flies, 4 $ '^ G. nasalis, and 12 $ $ , 

 4 c? c? of (r. equi, were taken round the same horse. The flies 

 came up wind to the horse, G. equi always appearing under the 

 belly between the fore and hind legs, while G. nasalis would 

 appear in the triangle formed by the fore legs, the neck, and 

 the ground. As a rule, the horse paid no attention to G. equi, 

 but G. nasalis caused him great alarm. The eggs of G. equi 

 were in hundreds on the shoulders and fore legs of this cart- 

 horse, but although the face and nostrils were searched carefully 

 no signs of eggs or larvte could be found thereon. Exhibiting 

 (2.) Chersodromia hirta, Walker, Col. Yerbury said these 

 little Empids were common on the shore near Prawle Point : 

 some Avere obtained by sweeping over seaweed, while others 

 were taken runninsf about over the sand. Although these 



