APPENDIX 



INDEX TO TERMS AND SYMBOLS 



OF THE 



WINGATE FLY CHART, PLATE I. 



THIS Index, together with the following "Table of Wing-cells and 

 Veins," the " Glossary," and plates, II, III, IV, V, VI and VII, will 

 explain the theoretical Diagram entitled The Fly Chart, illustrating 

 characteristic features and exterior parts, by the study of which the 

 reader may learn to differentiate all the sixty families which con- 

 tain species native to Great Britain. 



A = the Head, comprising nine regions and parts (A, I to A, IX). 



A, I, the Vertex, which contains (I) the Ocellar Triangle; (2) 

 the Ocelli; (3) the Vertical Triangle, a coloured patch 

 surrounding the ocellar triangle ; (7) the Vertical Orbit, the 

 sides of the vertex close to the compound eyes. The 

 Bristles hereabouts are (4) the Vertical (inner and outer) ; 

 (5) the Post-vertical; and (6) the Ocellar. 



A, II, the Compound Eyes, large and often hairy. 



A, III, the Frons is the forehead between the eyes; it contains 

 (I) the Frontal Stripe; (2) the Frontal Orbits at the sides 

 of the frontal stripe ; (3) the Frontal Lunule (plate VII, 5) 

 a crescent immediately above the antennae. The Bristles 

 hereabouts are (4) one pair of Frontal ; a row, or rows of 

 (5) Fronto-orbital; and (6) Lower Fronto-orbital. The (7) 

 Eye Margin is a narrow, often glistening, white line close 

 to the eye. 



A, IV, Antennae, jointed processes springing from between the 

 eyes just below the frons ; those with numerous joints are 

 illustrated in plate II, others in plate III. The Frontal Su- 

 ture in the middle of the face is a little pit in which short 

 antennae often lie close together. The (I) Basal Joints are 

 the two next the head; (2) theFlagellum, all the joints, when 

 numerous, taken together; (3) the First Joint is next the 

 head; (4) the Second Joint; (5) the third Joint (pin tc III, 1-9) 

 is sometimes ringed ; (6) the Arista, or Seta, is a plume, spine, 

 or bristle springing from the third joint at some point of its 

 upper surface between the base and the tip. 



