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Pomona College Journal of Entomology 



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Figure 271 



A, haltere of Eristalis from the dorsal side showing sensory areas, S, at the base; 

 B, haltere from below showing sensory and chordotonal areas, the last indicated 

 at L; C, nervons system of a fly, showing nerves to the lialteres, H; D, longi- 

 tudinal section of the thoracic nerve center, showing nerves connected with the 

 halteres, passing by direct tracts into the subesophageal connectives, H: E, 

 longitudinal section of the base of a haltere showing the two nerves and the 

 two types of sensory structures f<uind in the base; F, diagram much enlarged 

 of the chordotonal organ of the fly. 



