174 



PROCEEDINGS ENTOMOLOGICAL SOCIETY 



EXPLANATION OF PLATES XVII AND XVIII. 



a, antennal ring; b, basal joint of the antenna; c, clypeus; ca, cardo; 

 cer, cercus; co, condyle of the mandible; cs, clypeal suture; ex, coxa; e, ex- 

 terior angle of front; ecr, epicranium; ep, epistoma; es, epicranial suture; 

 /, front ;fe, femur ;fi, filament ;fo, fossa of the mandible ;/s, frontal suture; 

 g, galea; gu, gula; h, hypostoma; ha, hook-shaped appendix of last abdom- 

 inal segment of Ochthebius larva; i, interior angle of front; I, stipes labii; 

 la, lacinia; li, ligula; Im, lacinia mobilis mandibuli; Ir, labrum; m, mentum: 

 me, connecting lobe between maxilla and submentum; md, mandible; mo, 

 molar part of the mandible; oc, ocellus; p, posterior angle of front; pap, 

 pencil-shaped appendix of last abdominal segment of the H ydroscapha 

 larva; sm, submentum; st, stipes maxillae; su, sucking portion of last abdom- 

 inal segment of the Hydroscapha larva; t, terminal part of the mandible; 

 la, tarsus; ti, tibia. 



Fig. 1, Helodid. [Possibly Scirles n. sp.] Lateral view of the larva; 

 antennae broken in the specimen. (The natural size of the larva is 5 mm.) 



Fig. 2, Hydroscapha natans Lee. Dorsal view of the larva. (The natural 

 size of the larva is 1.5 mm.) 



Fig. 3, Hydroscapha natans Lee. 

 shaped hairs; and a long seta. 



Fig. 4, Hydroscapha natans Lee. 



Fig. 5, Hydroscapha natans Lee. 



Fig. 6, Hydroscapha natans Lee. 



Fig. 7, Hydroscapha natans Lee. 

 abdomen. 



Fig. 8, Hydroscapha natans Lee. 



Fig. 9. Hydroscapha natans Lee. Larva 

 from the buccal cavity, partly from below. 



Fig. 10, Ochthebius pygmceus F. Larva. 



Fig. 11, Ochthebius pygmceus F. 



Fig. 12, Ochthebius pygmceus F. 



Larva. Prothoracic filament; loaf- 



Lateral view of the larva. 

 Larva. Dorsal view of the head. 

 Ventral view of the head. 

 Ventral view of the end of 



Larva. 

 Larva. 



Larva. 



Left mesothoracic leg. 

 Left mandible seen partly 



Larva. 

 Larva. 



Right mandible; dorsal view. 

 Left mandible; ventral view. 

 Left mandible from the buc- 

 cal cavity. 



Fig. 13, Ochthebius pygmceus F. Larva. 

 Fig. 14, Ochthebius pygmceus F. Larva, 

 side and a little from above to show both abdominal hooks. 

 Fig. 15, Ochthebius pygmceus F. Larva. Lateral view, 

 size of the larva is 3.5 mm.) 



Fig. 16, Ochthebius pygmceus F. Larva. Dorsal view of the head. 

 Fig. 17, Ochthebius pygmccns F. Larva. Ventral view of the head. 



Left mesothoracic leg. 



End of the abdomen from the 



(The natural 



