203 Mr. F. W. Edwards on a 



The eyes in botli cases are dielioptic, the front, however, 

 being fully twice as broad in the female as in the male. 

 Pubescence rather short, being only about as long as tiie 

 width of two facets. In the male the eyes are divided by a 

 horizontal line (it is too narrow to be called a band) into an 

 upper and a lower portion ; the upper is nearly two-thirds 

 the size of the lower and its facets are very slightly larger. 

 In the female also the eyes are divided, but in this sex the 

 upper portion is very much smaller than the lower, and its 

 facets are very markedly smaller. The antennae are 15- 

 jointed in both sexes (my previous statement that the female 

 antennae were only 14-jointed was incorrect) ; in the male 

 the joints of the flagellum are all very much of the same size 

 and nearly globular; the female antennas are similar, except 

 that the terminal joint is distinctly enlarged and more oval. 

 The palpi are four-jointed, but the division between the last 

 two joints is not well marked, so that in some mounted 



Fig. 3. 



FiV 4. 



Elporia barnardi. 



Fig-. 3. — Labium. 

 Fig. 4. — HypopJiarynx. 



specimens they appear to be only three-jointed. The first 

 joint is the longest, being slightly longer than the second and 

 third taken together ; the second and fourth are each a little 

 longer than the third. The second joint has on its internal- 

 ventral aspect a circular pit, the floor of which is occupied by 

 a sense-organ, the structure of which is difficult to make out. 

 Under a low magnification this pit appears as a dark patch. 

 A very similar structure has been described by Scott in the 

 second joint of the palpi of Paltostoma, while organs differing 

 to some extent from these, although evidently homologous, 

 occur in the Simuliidse, Mycetophilidas, and Rhyphidae*. 

 The labium has precisely the same structure in the two 

 sexes ; there are scattered stiff-pointed hairs all over it, and, 



* These organs were first described h\ Wesche" (Biol. Bull. vol. xxiii. 

 1912, p. 267). 



