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TABANI DAE.— {Horse Flies.) 

 Common Genera. 



A. — Hind tibiae with spurs at tip; third segment of the antennae with 

 five rings; second segment but Uttle shorter than the first; wings 

 with dark markings — Chrysops. 

 AA. — Hind tibiae without spurs; third segment of the antennae with 

 a well-developed process — Tahanus. 



TR YPETIDA £.— (Fruit Flies.) 



Common Genera. 



A. — Bristle on each side of front with a terminal leaf-like appendage — 



Ceratitis. 

 AA. — Front without such bristles. 



B. — Wings with coloured markings not reticulate; Scutellum not 

 with six bristles; 4th long vein not conspicuously curved 

 forward at its extremity; Covering of body never black. 

 C. — Wings with four very oblique black cross bands; cross 

 veins not approximated. Scutellum with four bristles 

 yellow — Rhagoletis. 

 CC. — Cross bands on wings nearly transverse; cross veins but 

 little oblique — Trypeta. 



CERAMBYCIDAE.— {hong-horn Beetles.) 



Common Economic Genera. 



A. — Thorax margined; labrum united with clypeus body broad and 

 depressed. 



B. — Antennae 11-jointed; body elongate, parallel — Orthosoma. 

 BB. — Antennae 12-20 jointed; body stout, broad — Prionus. 

 AA. — Thorax not margined; labrum free; body oblong and cylindrical. 

 B. — Front tibiae obliquely grooved on inner side; last joint of palpi 

 pointed at tip. ^ 



C. — Elytra spined; size small — Psenocerus. 

 CC. — Elytra not spinose; large size. 



D. — Scape of antennae with an apical scar; body elongate 



— Mono hammus. 

 DD. — Scape of antennae without apical scar. 



E. — Tarsal claws divaricate and simple — Saperda. 

 EE. — Tarsal claws divaricate and cleft. 



F. — Eyes not divided ; thorax cylindrical — Oberea. 



