32 
Psyche 
[ March 
abdominal segments. From each trunk, eight short lateral 
branches take their origin, which are connected to the skin 
of the prothorax and first seven abdominal segments by 
means of lateral cords which correspond to the position of 
the spiracles in other Mycetophilid larvae. 
Although functioning spiracles are absent in this larva, 
the conditions for cutaneous respiration are extremely favor- 
able 1 . The skin is thrown into numerous folds which in- 
crease the respiratory surface. The integument is thin and 
richly supplied with a subcuticular net of tracheoles. The 
larva lives under a hygroscopic web of salivary secretion. 
Description of Plate U 
Macrocera anglica Edwards. 
Fig. 1 
Whole larva taken out of web 
X 10 
Fig. 2 
Head — Dorsal aspect 
X 72 
Fig. 3 
Head — ventral aspect 
X 72 
Fig. 4 
Labrum — oral aspect 
X 250 
Fig. 5 
Mandible 
X 250 
Fig. 6 
Maxilla 
X 250 
Fig. 7 
Hypopharynx and Labium 
X 250 
Fig. 8 
Terminal body segment 
X 72 
Key to Lettering of Plate 
An. Antenna 
Ab.m. Abductor muscle 
Ad.m. Adductor muscle 
C.R. Chitinous ring 
E. Eye 
Hy. Hypopharynx 
Lb. Labium 
Mx. Maxilla 
Mx.P. Maxillary Palp 
Mx.Pl. Maxillary Plate 
Pr. Prostheca 
S.P. Sensory Papilla 
’The modification of the respiratory system in some Dipterous 
larvae will be dealt with separately in a special paper. 
