PLATE LYIII. —External Anatomy of a Fly. 
Fig. 1. Vertex. 
„ 2. Front. 
,, 3. Fronto-orbital bristles. 
,, 4. Vibrissa. 
,, 5. Palpi. 
j, 6. Scutellum ; the part lying below this is the Mesonotum. 
,, 7. Haltere. 
„ 8. Pre-apical bristle. 
In the left-hand figure the veins of the wing are marked thus : the 
Costa, Sub-costa, Cross-veins, Anal veins, and the two Basal cells are black. 
The four Posterior cells are lightly dotted. The Radius and its branches 
are red, the Media green, and the Cubitus blue. 
