880 CHARLES Paut ALEXANDER 
just described, the writer found larvae and newly transformed pupae in 
great numbers, the former pupating in the dry sand rather distant from 
the water’s edge. In one dry patch of sand on a rocky ledge, sixty 
specimens were found in six square inches of soil. The insects are often 
found in gravel or coarse sand that is thickly penetrated by grass roots 
and rhizomes, rarely in pure gravel. They are most commonly found 
in soil that has been recently deposited after freshets. The immature 
stages of Hexatoma are associated with larvae of Hriocera spinosa, E. 
cinerea, Tipula bella, and Atherix probably variegata Walk., with pupae 
of Chrysops excitans Walk., and with many beetles such as Paederus 
littorarius Grayv., Gastrolobium bicolor (Grav.), Bledius sp., Omophron sp., 
Dyschirius sphaericollis Say, Tachistodes partiarius (Say), Anadaptus 
discoideus (Dej.), Laccobius agilis Rand, and other species characteristic 
of the sandy margins of large streams. The pupal duration of Hexatoma 
is six and one-half days. 
Larva.— Length, 14-15 mm. 
Diameter, 1-1.3 mm. 
Color of body, pale brownish yellow. 
Body covered with rather abundant appressed hairs, the subterminal distended part of 
abdomen with transverse rows of very short spines or setae, there being from thirty-five to 
forty such rows. Spiracular disk (Plate LI, 246) surrounded by four lobes; ventral lobes 
the longer, with a fringe of a few long hairs at apex; on inner face a long, narrow, brown 
mark, extending from the tip inward, the proximal end expanded; lateral lobes with numerous 
long hairs which are gradually shorter toward base of lobes. Spiracles circular, situated at 
base of lateral lobes; a dusky mark extending from spiracles dorsad. 
Head capsule of usual hexatomine type, as described for Hriocera longicornis (page 888). 
Entire general features and details of mouth parts very similar to those of Eriocera longicornis. 
Labrum (Plate LI, 243) transversely oval, with frame strong and chitinized, anterior media 
part produced into a small lobe (Plate LII, 250) bearing two lateral papillae and two setiferou 
tubercles surrounded by short hairs; lateral margins of labrum produced into prominen 
lobes directed proximad and cephalad, densely hairy and entirely protecting anterior margi 
of labrum. Antenna (Plate LI, 244) with apical papillae shorter than segment, the larges 
papilla transversely sculptured (Plate LII, 251). Mandible (Plate LI, 245) long and slen 
der, the lateral teeth more accentuated than in Eriocera; largest tooth with a flattened trun 
-cated blade in its axil, this in some cases broken up into two or three small blades; basa 
of largest lateral tooth a flattened lobe which is barely indicated in the species of Eriocer 
studied. Maxilla with outer flattened blade conspicuous; palpus near its base on inne 
side, similar to the condition obtaining in Eriocera; just laterad of palpus a powerful set 
Pupa.— Length, 9.2-9.6 mm. 
Width, d.-s..1.2 mm. , 
Depth, d.-v., 1.4mm. | 
