FAM. MYCETOPHILIDiE 
73 
24. Genus BOLETINA, Staeger 
Boletina. Staeger, in Krojer, Natuihist. Tidsskr. Vol. 3, p. 233 (4) (1840). 
Fungina. Rondani, Dipt. Ital. Prodromus, Vol. i, p. 194 (3) (i856). 
Agaromya. Rondani, ibidem. Vol. 4, Corr. p. 12 (1861). 
Euryceras. Marshall, Trans. New Zeal. Instit. Vol. 28, iSgS. p. 291 (1896). 
Palseoboletina. Meunier, Mon. Mycetoph. etc. p. i5o {1904). 
Characters. — Head small, round, flattened in front, placed low upon the thorax; eyes oval, 
emarginate at the base ot the antennas; ocelli three in number, the middle one small, placed m a flat- 
tened triangle upon the broad front; palpi incurved, four jointed, the first one small, the fourth longest; 
antennae projecting forward, longer than the head and thorax taken together, that of the female shorter 
than that of the male; 2+14 jointed, the two basal joints differentiated, cupuliform, the flagellar joints 
cylindrical, somewhat compressed, pubescent, or nearh' bare. Thorax short, oval, highly arched; meta- 
thorax high, steep, somewhat arched, scutellum small. Abdomen seven segmented, long and slender, 
cylindrical; in the male with a short forceps (PI. 7, Fig. 8, 9), in the female with a very short 
ovipositor at the tip of which there are two small lamellse. Legs long and slender, the femora slender, 
slightly compressed, all tibiae with spurs and with weak lateral setae; fore metatarsus shorter than the 
corresponding tibia. Wing elongate oval, with somewhat rounded base, as long as or somewhat longer 
than the abdomen, microscopic setulose. Costa somewhat produced beyond the tip of the radial sector 
but not reaching the tip of the wing ; subcostal vein ends in the costa before the middle of the wing length, 
and is connected with R^ by Sc^ (subcostal crossveinj; media forks under or somewhat distad of the 
radial sector; cubitus forks under or proximad of the fork of the media; anal vein incomplete (PI. 5, 
Fig. 8). 
The larvffi of these gnats have been reared from decaying wood and also from fungi ; the adults 
are found in woods m all seasons except in mid winter, though more commonly in Spring and Fall. 
Euryceras, Marshall (PI. 5, Fig. 9), and Palaeoboletina, Meunier (PU 5, Fig. 10), cannot well 
be separated from Boletina. The slight variations from the tj-pical form which may appear in the wing 
venation are not sufficient to distinguish generically, when several North American species which form 
connecting links are taken into consideration. 
Type species ; B. triviiiaia, Meigen. 
Geographical distribution of species : 
1. B. abdominalis, Adams, Kans. Univ. Sc. Bull. Vol. 2, p. 24 (1903). United States. 
2. B. ajiaclitiiformis, Meunier (fossil), Mon. Mycetoph. etc. p. i52 (1904). Baltic amber. 
3. B. anaclinoides, Marshall, Trans. New Zeal. Instit. Vol. 28, iSgS, p. 292, New Zealand. 
pi. II, f. I, pi. i3, f. 14-15 {Euryceras) (1896). 
4. B. aiiah's, Meigen, Syst. Beschr. Vol. i p. 257 (9) (Lea) (1818). Europe. 
duhia, Meigen, Klass. Vol. i, p. 92 (9) \I\Iycetuphila) {1804). 
5. B. analis, var. postposita, Strobl, Wien. Ent. Zeit. Vol. 19, p. 98 Europe. 
(Phthinia?) (igoo). 
6. B. arciica, Holmgren, Ofv. Vet. Akad. Forh. Vol. 29, p. io5 (1872). Greenland. 
7. B. basalis, Meigen, Syst. Beschr. Vol. i, p. zSj (8) (Leia) (181S). Europe. 
Inimeralis, Zetterstedt, Ins. Lappon. Dipt. p. 862 (7) (Leia) (i83S). 
nigra, Zetterstedt, ibidem, p. 862 (6) {Leia) (i838). 
— B. basalis, Staeger, p. p. = groenlandica, Staeger. 
— B. basalis, Winnertz (nec Meigen) = Winnerisii, Dziedzicki. 
8. B. beriiigensis, Coquillett, Dipt. Commander Isl. p. 342 {N eoglaphyro- North America. 
ptera) (1899). 
