348 



PSYCHE. 



[April 1899. 



present, the minte size of the mouth- 

 parts making iheir dissection very 

 difficult. 



Cccidomyia sp. The moutliparts of 

 Cecidomyia sp. are essentially like those 

 of Catocha. 



Mycetophilidae. 



Sciophila sp. Sciophila (iig. 7) pre- 

 sents an instructive mouthparts condi- 



Fig. 7, Mouthparts of Sciophila sp ; lb 

 labnim, ep epipharynx, mx maxilla, mx. I 

 maxillar lobe, mx. p maxillar palpus, // 

 labium, hyp hvpopharjnx. 



tion. Mandibles are wanting, and the 

 maxillar lobe is small and rudimentary. 

 The labrum-epipharynx is separable, 

 after softening in hot K O H, into its 

 component parts, a well chitinized, 

 sharp, tapering, pointed labrum (fig. 7 

 //') and a broader membranous epiphar- 



ynx (fig. 7 (■/) with irregular dentations 

 at apex. The maxillae (fig. 7 mx) 

 present an elongate basal part 

 with a median longitudinal region 

 strongly chitinized, a distinct palpifer 

 from which arises the 5-segmented 

 palpus {mx. p)2.\\6. a small but distinct 

 terminal lobe {mx. I) . The labium (fig. 

 7 //) presents a basal sclerite in which, 

 as in the maxillae, a strongly chitinized 

 longitudinal region is conspicuous, in 

 each half ; the paraglossae are large 

 thick, fleshy, concave on inner face, and 

 show no signs of pseudo-tracheae ; the 

 fused glossae are represented by a very 

 delicate median membranous lobe. 

 The hypopharynx (fig. 7 hyp^ is much like 

 the epipharynx in condition being rather 

 broad, and irregularly dentate at apex. 



Platyura sp. Mouthparts essentially 

 like those of Saophila. Hypopharynx 

 broadly triangular ; maxillae with 5-seg- 

 mented palpus and weak, spoon-like, 

 terminal lobe as long as first palpar 

 segment. Labium with free, elongate 

 paraglossae ; glossae fused to form a 

 single, short, broad, median lobe. 



Mycetophila (two species) . The 

 genus shows a specialization in its 

 mouthparts distinctly beyond the con- 

 ditions presented by Sciophila and Plat- 

 yura. The maxillae have no lobes, and 

 the maxillary palpi are 4-segmented. 

 The labial lobes are all fused to form a 

 single broad plate-like lobe, in which 

 two large tracheal trunks (or pseudo- 

 tracheal trunks) are visible. 



