FAM. MYCETOPHILID.^: 
5 
c. Radius with more than two branches, anterior branch of the radial sector 
sometimes short and crossvein like. 
d. The M-Cii crossvein far proximad of the R-M crossvei/i, the cell M 
less or but little more than half as long as cell R (PI. 3, 
Fig. 1-3). 2. Subfam Bolitophilin^. — (£> 
dd. The R-M and the M-Cii crossvein nearly equidistant from the base 
of the wing, iistially only one basal cell. 
e. The radius four branched [P\. 3, Fig, 4, 5) i. Subfam. PachyneuriN/E. 
ee. Radius j^'itli hut three branches {P\. 2, Fig. !, 2). . . 3. Subfam. Mycetobiin^,. ^ 
cc. The radius with but tiiio branches {P\. 3, Fig. 10) 4. Subfam. Diadocidin^. 
bb. The radio-medial crossvein (R-M) obliterated by the coalescence of a section 
of the basal portion of the radius and media at the point where the 
crossvein usually is (PI. 3, Fig. I 4-). 
c. Antennae short, usually thick set and often fultened 5. Subfam. Ceroplatin/E. 
cc. Antennae very slender and nearly as long and often vnicJi longer than 
the body 6. Subfam. Macrocerik^. 7 ; ,' 
aa. The medio-cubital crossvein {M-Cu) absent. 
h. The anterior branch of the radial sector (^R^j^f) distinct, short, ending in i?, 
and appearing like a supernumerary crossvein bounding distally the small 
rectangular or trapezoidal cell R, (PI. 2, Fig. 3) 7. Subfam. Sciophilin^. f 3.<3, 
bb. RiJf-j not distinct from R^-\-5, tlte cell R, tints open to the margin of tlie 
wing {PI. 2, Fig. 4) 8. Subfam. Mycetophii.in/E. -V 5 ! 
I. SUBFAM. PACHYNEURIN/E 
Pachyneurinae. Van der Wulp (part). Dipt. Neerland. p. 201 {iF<yj). 
Characters. — Long slender forms with elongate abdomen, long antennae, long coxae, narrov/ 
wings, radius four branched, both the basal cells R and M distinct and closed at the distal end by the 
crossveins, the cell M not much shorter than cell R. 
TABLE OF GENERA 
a. Media forked (PI. 3, Fig. 4) i. Genus Paschyneura, Zetterstedt. 
aa Media simple (PI. 3, Fig. 5) 2. Genus Thiras (fossil), Giebel. 
I. Genus PACHYNEURA, Zetterstedt 
Pachyneura. Zetterstedt, Ins. Lappon. Dipt. p. 85o (i63) (i838). 
Characters. — Elongate, slender form; antennae seventeen segmented, about half as long as 
the body, the first flagellar segment short; the legs bare, the tibiae with a few setae; the wing venation 
peculiar, Sci about half as long as the wing, Scg absent, the radius four branched, the media two 
branched, its base wanting or very indistinct; the cubitus forks near the middle of the wing (PI. 3, 
Fig. 4). 
