142 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 
The life-history of this very interesting species is still not well 
known. The larva lives in gravel or sand along the banks of 
streams. On April 26, 1914, some gravel from the banks of Cas- 
cadilla Creek, Ithaca, N. Y., was examined near the place where 
the pupal skins were found in 1913 (see later) . No signs of larvas 
or pups were discovered after a close search. On May 6, the same 
bank was examined and some ten larvae and seventy-five pupae were 
found. They occurred in the gravel that was thickly penetrated by 
grass-roots and rhizomes; pure gravel was nearly destitute of these 
insects. Associates of these larvae and pupae at this time were Pae- 
dcnts littorarius, Laccohiiis acjilis, many larvae and pupae of Tah- 
(luidac and a few Erioptcriuc crane-fly larvae. Some of the larvae 
pupated during the night while in water contained in a flat porcelain 
dish. The above data seems to indicate that the larval existence is 
spent in or under the water of the stream and the larva comes to 
live in the sand along the edge of the stream only when fully grown 
and ready to pupate. 
The pupa occurs in the sand as described above, usually in com- 
pany with the larvs of the species and various associates. The fol- 
lowing data is taken from my field notes. May 2, 1913 : Two fully 
grown pupa? and several cast pupal skins were found on a pebbly 
beach along Cascadilla Creek. They were much rarer than the 
adult flies of two years ago and the number of cast skins per square 
foot for any place was only three or four, nothing like the numbers 
found in the related Eriocera longicornis Walker. May 3, 1913. 
One pupa found on a pebbly beach along the Inlet (Ithaca) by J. C. 
Faure. It was in the loose sand with such natural associates as the 
following: larvae and pupae of the deer-fly, Chrysops excitmis, and 
many adult beetles, C'niudcla scxcjiiUata, and C. vulgaris, common; 
Elaphriis ntscarhts, a few; Tachys, sp., se\eral ; Omophron, sp., 
Dyschiriiis spluwricoHis, Ayonoderiis partiarius, Anjsodactylus dis- 
coideus, Cryplobiiini bicolor, Pacdcrus littorarius, Bledius, sp., etc. 
The pupa of Hcxatoma occurred in the same stratum as the adults 
of Omophron. 
The adult insects fly during May and June and may be swept from 
rich vegetation near the streams from which their larv;c emerged. 
