1918] LeaJ Eating Crane Fly 83 



transvcrsch' elongate, somewhat overlapped anteriorly by a cuticular 

 fold. The oval-rounded stigma {sp.) consists of a transverse slit with 

 scalloped edge, encircled on the outer periphery by two scalloped 

 margins, the outer of which is densely chitinised. The stigmata are 

 somewhat widely separate. 



Head-capsule of Larva and Mouth-parts (Figs. 8-13). — Head retracted 

 into the first thoracic segment, mandibles, maxillse, labium and labrum 

 apparent in ventral view (Fig. 8). Antennae (Figs. 8 and 11, ant.) arising 

 from head-capsule at base of labnmi, 2-segmented, the first elongate, 

 pear-shaped, much stouter than the second, thimble-shaped segment, 

 Mandibles (Figs. 8 and 12, md) strongly chitinised, many-toothed 

 ventrally, beset with a ventral tuft of hairs posterior to the 

 odontophore extremity. They operate with a latero-vertical move- 

 ment. Maxillae very short and broad, consisting of a two- 

 segmented palp (Fig. 9, m. p.) and inner lobe {mala) ; second segment 

 of palp thimble-shaped and much smaller than the broad, splint-shaped, 

 first segment; mala {ma) beset with a brush of bristles on its inner, 

 lateral margin and a smaller one on its anterior, outer corner. Labrum 

 (Figs. 8-11, labr.) tongue-shaped, terminating in four teeth anteriorly, the 

 internal pair larger than the external pair; stoutly chitinised marginally, 

 margin appearing as if involute ventrally, terminally and antero-laterally 

 beset with close-investing hairs; a few, sparse, bristles distributed reg- 

 ularly on its surface; 3-segmented {1, 2, 3), with two paler interseg- 

 mental bands {la, 2a). The labium (Fig. 10) deeply incised posteriorly 

 to fomi two broad arms, each of which is again incised jjosteriorly in 

 fish-tail fashion; more strongly chitinised posteriorly than the anterior 

 odontophore margin which bears seven teeth on each side of the median 

 small one, the first and third of each side being the largest. Hypo- 

 pharyngeal sclerite (Fig. 13), dorsal to the labium, provided with two 

 rows of tiny denticles ; strongly chitinised; excavated anteriorly trough- 

 wise, a weakly chitinised, central lobe {c. I.) provided with an anterior, 

 denticulate margin filling the excavation; posteriorly, on each side, a 

 pair of arms, the dorsal member of each pair {d. a.) more slender than 

 the ventral {v. a.). 



Articulating with the external, posterior angle of the mandible is a 

 pair of stoutly chitinised, elongated processes (Fig. 8, d. a. p.), broadening 

 considerably posteriorly where they are deeply incised to form two 

 slender arms of which the outer, directed postero-laterally, is apparently 

 continuous with an equally slender process given off ventrally from the 

 labium; the inner tapers off gradually in the dorsal wall of the capsule. 

 Anteriorly, from each dorsal, articulating process, there arises laterally 

 a small process which partly encircles the ocular aperture. The slender, 

 chitinous continuations of the various sclerites serve to support and 

 strengthen the very delicate, transparent walls of the head-capsule. 



In the walls of the capsule itself, (Fig. 8) there is dorsally on each side 

 a deep, v-shaped incision {d. v. i.) separated by a tongue-process, sharply 

 truncate posteriorly and ventrally, a similar incision situated medially 

 and ventrally {v. v. i.). 



