BEACHYCERA. 



245 



appear to afford good characteristic distinctions of the species. 

 Pigs. 3 and 4 are the mandibles of the male and feinale of 

 Acams Sacchari, magnified 390 diameters. 



Fig. 4. 



Fig. 3. 



Female. 



Male. 



APPENDIX B, RELATING TO THE INSECTA. 

 I. 



The following note by the Author occurs in the second edition 

 of the German work, and was omitted under the head of the 

 Brachycera, to which it refers : 



" I may also mention here a few facts derived from comparative ana- 

 tomy and pathology. The most common therapeutics in cases of (Estrus 

 Ovis in the frontal sinus are incision or trepanning of the frontal sinus, 

 and removal of the larvae by means of injections, or by means of a pair of 

 pincers. I, for my part, consider such proceedings only justified after 

 having found sternutatories (e.g., the so-called Schneeberger snuff, or a 

 kind of snuff prepared from Marum verum, mixed with finely powdered 

 insect-powder) of no avail, and in case the larvae of the (Estrus remained 

 unremoved. It is of common occurrence that the larvae of (Estrus are found 

 sneezed out on the pasture land in spring time. We ought to imitate 

 this process of nature, based upon the natural history of the (Estridce. 

 The above sternutatory, mixed with insect-powder, as the means for 

 killing larvae, has proved very effective during the last year. The ob- 

 servations which Bruckmiiller made on a young vertiginous colt are very 



