2 JOURNAX. OF ENTOMOLOGY AND ZOOLOGY 
truncated) are quite lacking in lUa, the larva possessing five lobes 
around the stigmal field, the mouth-parts similar to those of Limno- 
phila, the pupa essentially Limnophiliuc, etc, 
Stannius (Beitr. zur EntomoL, vol. 1, p. 205, 1826) was the 
first to give us any information on the immature stages of any mem- 
ber of this genus. He states that the larva of JJla macroptera (as 
pilosa Schummel) lives in species of Agariciis, and remarks that 
the larva is very similar to that of Limnohia xanthoptera Meigen. 
Perris (Note pour servir a I'histoire de la Cylindrotoma macrop- 
tera Macquart, in Notes pour servir a I'histoire des metamorphoses 
de diverses especes de Dipteres; Ann. Soc. Ent. France, vol. 7, pp. 
337 to 341, 1849) gives a brief description and unsatisfactory 
figures of this same species. He describes the caudal end of the 
body as having but four lobes, two being lateral and two ventral; 
no mention is made of the median dorsal lobe, and it may have been 
overlooked or it may be very reduced in this species; the caudal or 
inner aspect of these lobes that surround the stigmal field are pro- 
vided with small chitinized pieces which, as the author suggests, 
may serve as points of attachment for the muscular fibres. His 
account in part may be translated as follows : The fungus in which 
the larvae were found was Hydnum erinaceum Bull., which grows 
on the trunks of living oal;:-trees. The larvae are gregarious and 
frequent galleries in the fungus along which they progress by means 
of their mandibles, which move transversely to their bodies, by 
their ambulatory feet, by their short hairs and the lobes of the last 
segment. They were found in the month of November in the 
Mont-de-Marsan, and a month later they were going into the earth 
where they transformed as pups. These latter quite resemble the 
pupae of Ljmnophila, having the same structure, same size, the same 
hooks, differing only in the color, which is uniformly testaceous, 
though the breathing horns, instead of being very recurved, are 
scarcely sinuous. When the time of the last metamorphosis has 
come, that is about in the months of February and March, the 
nymph raises itself by means of the spines, comes to the surface of 
the earth and places itself in position; soon the head and thorax 
split longitudinally, and it is by this movement that the adult 
escapes, leaving the exuvia of the nymph fixed in the earth. 
