Genus Cellia. 



107 



depressions made by the feet of cattle. Not only in fresh water, 

 but also in salt water, for Dr. Low records it in a lagoon of water 

 shut off from the sea by a bank of sand only ten yards wide, 

 with no vegetation except some old seaweed — in fact, almost any 

 natural collection of water may contain them. So far, none have 

 been found in tubs, barrels, or any other artificial collection. 

 The figures given in the monograph of the larval characters 

 (p. Ill, fig. 65) are not of this species, but probably of C. argyro- 

 tarsis sent with them, both larvae now and again occurring in 

 the same pool, The descriptions given here of the egg, larva and 

 pupa are drawn up by Dr. Grabham, who has followed them 

 closely in development. 



The Egg. — Eggs laid in batches of fifty to eighty arranged 

 together side by side or in stellate groups on the surface of the 

 water. Length, 0'4 mm., breadth, 0*2 mm., across the widest 

 points of the floats. Upper surface dumb-bell-shaped. Fringe 

 represented by a thickened ridge without striation. Floats of 

 relatively large size, attachment to seven-eighths length of 

 fringe. On the under surface the floats nearly meet. Lower 

 surface with irregular polygonal markings. 



The larva. — Head with distinctive markings as in the figure. 

 Brushes when extended reach as far as the extremities of the 

 antennae. Four simple hairs project over mouth, of nearly equal 



Fig. 21. 



Cellia albimana. Wiedemann. 



a Larval head ; b palp ; c labial plate. 



length, outer pair slightly longer. A pair of small curved hairs 

 on the edge of clypeus near the median line. Four plumose hairs 

 arranged across the centre of the head. Two smaller additional 

 ones placed externally and more anteriorly. From the antero- 



