172 [March 



EXPLANATION OF THE PLATE. 



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

 m, ocelli ; k mandibles; x, cardinal pieces of maxillae; h, inner, coriace- 

 ous piece of the 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; b, epistoma ; t, emargination of the 

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

 Fig. 'A. Head of Sciara (larva) from below; h maxillae; d, k, .r, as in figure 1; 

 t', horny stripes, connecting both edges of the shell of the head. 



The same head from above ; a, d, c, t, g, f as in figures I and 2. 



The same head from below, the maxillce being removed, to show the po- 

 sition of the mandibles k; t' as in figure 3. 



Head of Sciophila limbatella Zett. (larva) ; a, d, f as in the previous 

 figures. 



The same head from below; i palpi, developed in this genus ; y labium ; 

 t' suture of the horny shell of the head; d, k, x as in figure 1. 



Head of a larva analogous to the preceding, perhaps that of Leja, from 

 below. X and t' as in figure 7. 



Head of Bolitophila cinerea (larva) from above ; a, d, f as in figures 1 and 

 2 ; b small pellucid spots, peculiar to these larvse (not the ocelli, which 

 are more on the side of the head). 



Three lines, showing the different emarginations of the occipital margin 

 of the head. 



Mouth of Mycetophila (larva), from the side, to show the relative position 

 of the parts ; d, k, h, a, m as in figure 1 ; r and 5 are the two points of 

 attachment of the mandibles. 



Sketch, indicating the openings in the horny shell of the head, as well as 

 the intervals between the trophi, which are visible when the head is 

 viewed in the direction of the axis of the body, d, a, m, as in figure 1 ; 

 k*, interval between the root of the mandible and the shell of the head ; 

 n*, intervals between the maxillae. 

 Fig. 13. Labrum of the larva oi Mycetophila signata; c, its horny frame, ciliated 

 on the inside at the tip ; d fleshy portion. 



Labium of one of the larvae. 



Mandible of Mycetophila signata : r and s, points of attachment ; q, den- 

 ticulations on the edge of the stouter part of the lamel. 



Mandible of Sciara (larva). 

 " " of Sciophila (larva). 



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. 

 Fk;. 19. Maxillae of Bolitophila (larva) ; o, d' and z as in the preceding figures. 

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



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

 Fk;. 22. Pupa of Sciara to.ioncura (). wS. 



