172 [March 



EXPLANATION OF THE PLATE. 



Fig. 1. Head of Mycetophila signata (larva), from below; a, antennae, d, labrum; 

 m, ocelli ; k mandibles; .r, cardinal pieces of maxillse; h, inner, coriace- 

 ous piece of tbe maxilla; i, round excision in the external, horny piece 

 of the same, through which protrudes the rudimentary palpus. 



Fig. 2. The same head, from above ; a and d the same as in the preceding fig- 

 ure ; c, horny frame of the labrum; h, epistoma; t, emargination of the 

 occiput; g, notches on both sides of the occiput ; /. occipital lines. 



Fig. 3. Head of Sciara (larva) from below ; h maxillse ; d, k, x, as in figure 1 : 



nuuiaunjii.-5 uu uuc cuge oi uae aiouier pare oi lue lamel. 



Fig. 16. Mandible of Sciara (larva). 



Fig. 17. " " of Sciophila (larva). 



Fig. 18. Maxillae of Sciara (larva),- z, cultriform, coriaceous, serrated inner lobe; 

 d' horny external piece, with the excision i, through which protrudes 

 the rudimentary palpus ; the small horny ring upon it may be indica- 

 tive of a second joint; x, cardinal piece; o, horny pieces, connecting 

 the upper and lower parts of the maxillae, and serving as point of at- 

 tachment to the muscular fibres. 



Fn:. 19. Maxillae oi Bolitophila (larva) y o, d' and z as in the preceding figures. 



Fig. 20. Ceroplatus (larva), copy from Dufour, reduced. 



Fig. 21. Bolitophila (larva), magnified and natural size (indicated by a line). 



Fi<;. 22. Pupa o{ Sciara to.roncura O. S. 



