It always appears to me that the Anopluras (Parasita Lat.) 

 would much more naturally terminate, than commence the Class 

 Insecta ; for it is evident that there is at least some analogy be- 

 tween the Hippoboscidae and the Pediculi, and in their habits 

 they are extremely alike. But I can never see the slightest 

 similarity between these last and the Cicindelidae, which have 

 a greater resemblance to Spiders, especially in the larva state, 

 when they have 8 eyes, and are equally sanguinary ; and if we 

 look at the perfect insects, Manticora for example is much 

 more like the Araneidae than the Pediculi ; and Cicindela ger- 

 manica when running can scarcely be distinguished from a 

 Spider, inhabiting the same damp situations. 



It is well known that the Insects of this Order instead of 

 laying eggs deposit the chrysalis, which is at first milk-white 

 but soon becomes black, as represented at fig. A. Three of 

 these pupae were transmitted to me by Mr. John Bolt of Lynd- 

 hurst, who informed me they were laid in the evening and 

 night of September 13th and 17th. I have them still, but 

 they have not hatched. 



These flies run swiftly, and like a crab, sideways or back- 

 wards; they are very tenacious of life, and live principally upon 

 Horses, attaching themselves to the belly, between the hind 

 thighs and under the tail, where they are less protected by 

 hair. It is remarked by Latreille that the ass fears them 

 the most ; and that horses suffer very little from them, pro- 

 bably when they have overcome the irritation which they must 

 at first occasion: they cannot cause much pain, otherwise 

 horses could not live in forests in the summer. Mr. Samouelle 

 in his Useful Compendium, gives the following interesting re- 

 marks on the H. Equina : " In the New Forest of Hampshire 

 they abound in a most astonishing degree. I have obtained 

 from the flanks of one horse six handfulls, [each of) which 

 consisted of upwards of a hundred specimens. Mr. Bentley 

 informs me, from observations he made in the summer of 1818, 

 while in Hampshire, that the Hippoboscce are found in con- 

 siderably greater abundance on white and light coloured 

 horses than those of a black and dark colour ; and this ob- 

 servation was confirmed by the stable-keepers in the vicinity 

 of the Forest." 



The Plant is Tanacetum vulgare (Common Tansy), 



