636 E. N. PAVLOVSKY 



by a canal (Toxt-fig. 8, md) serving for the pumping of the 

 siicked-up liquid into the intestine. I 



The prey is in the air while the larva ofH.caraboides { 



is feeding, and in order that the liquid parts may be sucked ■ 



up it is necessary that the prey should be tightly pressed to 

 the mouth-aperture of the larva. 



The oral slit is situated between the upper- and under-lips 

 of the larva (Text-fig. 9, ap), and the hind third or quarter of 

 the mentum is covered with minute chitinous spines (Text- 

 figs. 3, 4, vi). Larger spines are found sticking out as a bundle 

 on the tuberculiform elevation on the connective chitinous j 



(Text-fig. 4, St) covering at the base of the lower jaws. ] 



Thanks to these peculiarities, the deeper parts of the peri- ! 



phery of the oral aperture adhere tightly to the adjacent j 



parts of the seized prey, and when the mouth-parts are closed 

 the slits between their bases are filled up by soft connective 

 chitin. Thus is obtained a hermetic contact of the oral opening 

 with the body, the liquid parts of which have to be sucked up. 



The oral armature of the larva of H. caraboides does 

 not play a mechanical part only. 



Very likely it serves also for receiving gustatory irritations, 

 as on the lower lip there are scattered special sensory organs 

 in shape of large pits in the chitinous cuticula. Eing-shaped 

 sense-organs are found also on the outer edge of the third 

 antennal joint ; on the tips of the antennae and labial palpi 

 there are situated bundles of special chitinous spines (sensory 

 organs ?) ; it may be remembered that on the upper surface 

 of the mentum of the mature larva there are symmetrically 

 scattered short and stout spines, bordered at their base ; 

 analogous formations are found also on the dentate lateral 

 prominences of the mentum (Text-fig. 4, m). 



The prey, prepared mechanically (by the mouth-parts) and 

 chemically (by the ferments of the digestive fluid), enters in 

 parts into the feeding larva. The work of the mouth-armature 

 one is inclined to compare superficially with chewing. This 

 comparison obtrudes itself upon one's mind when one sees 

 how energetically the larva kneads the prey with its mandibles, 



