io6 
DIPTERA 
29. A. tomentosa, Meunier (fossil), ibidem, p. 167, pi. i3, f. 16 {Brachy- Baltic amber. 
canpta) (1904). 
io. A. triangularis, Strobl, Mitth. Naturw. Ver. Steiermaik, 1894, iSg Central Europe. 
(^Brachycampta) (i8g5). 
3i. A. unicolor, Lundb., Vidensk. IVIeddel. p. 260 {26) {Br achycampta){iSgS). Greenland. 
The species alterna, auiiulata, aptcalis Walker, bovealis, brevtcoriiis, cuuescens, cmcttcoriiis, concolof, con- 
formis, despeda, festiva, flaviceps Meigen, fuscipennis, fuscula, gracilis, griseola, inermis, longicornis, nubila, 
obsciira Walker, sericea Say, sobria, taeniata, termtnalis and venosa, which are listed with Mycetophila, may 
belong to Allodia. 
57. Genus EXECHIA, Winnertz 
Exechia. Winnertz, Verh. Zool.-bot. Ges. Wien, Vol. i3, p. 879 (35) (i863). 
Parexechia. Becher, Insekten von Jan Ma3^en. p. 62 (1886). 
Brachydicrania. Skuse, Proc. Linn. N. S. Wales (2), Vol. 3, p. i2i5, (14) (1888). 
Characters. — Head roundish, compressed in the front part, situated deep in the thorax; 
front broad. Eyes longish round; lateral ocelli large, closely contiguous to the eye margin, middle 
ocellus either very small, placed in a groove on the front, or entirely wanting (PI. I , Fig. 22); palpi 
incurved, four jointed, first joint small, fourth longest; antennae projecting forward, somewhat arcuated, 
2-I-14 jointed, first joint of the scapus cyathiform, second much shorter than the first, cupuliform, 
both setiferous at the tip; flagellar joints cylindrical, somewhat compressed, with minute downy 
pubescence. Thorax ovate, highly arched, with a short pubescence, setose on the lateral and hind bor- 
ders; scutellum semicircular, setose, metanotum steep. Abdomen slender, in the male with six, in the 
female with seven segments, narrowed at the base, cylindrical or a little compressed; anal joint of the 
male rather large, forceps moderate or small (PI. 7, Fig. I 6) ; ovipositor of the female very short, 
with two small lamellae. Legs long, slender, intermediate and hind femora rather broadly compressed, 
tibiae spurred, and with lateral spines; fore pair with one distinct range of very minute spines on the 
inner side, and a few small spines along the outer side, intermediate pair with a range of small spines 
on each side, hind pair with two ranges of rather longer spines on the extensor surface (PI. I , Fig. 17); 
plants of metatarsus of hind tarsus with minute setulae. Wings shorter, subequal, or a little longer than 
the abdomen, oblong oval, with rounded base, with microscopic setulas arranged in longitudinal rows. 
Subcostal vein very short, complete or incomplete, directed toward Ri ; costal vein does not extend 
beyond the tip of the radial sector and does not reach the tip of the wing ; media forks under or proxi- 
mad of the basal sector of the radial sector; cubitus forks distad of the fork of the media, its branches 
widely divergent; anal veins rather long but incomplete (PI. 6, Fig. I 9). 
Brachydicrania and Parexechia do not differ from Exechia except that they possess but two ocelli 
while Exechia has three, the middle one being very minute. The forms with two ocelli should not be 
confused with Mycetophila which has very stout tibial lateral setae, and larvae with ambulacral setulae. The 
larvae of Exechia are commonly present in many species of fungi. They do not have the transverse 
rows of ambulacral setulae. 
Type species : E.fungorutn, Degeer. 
Geographical distribution of species : 
'^i. E. abbreviata, Skuse, Proc. Linn. Soc. N. S. Wales (2), Vol. 3, p. 1219 Austraha. 
(172) [Brachydicrania) (1888); Vol. 5, p. 629 (1890). 
— E. analis, Coquillett (see Mycothera). 
