Xo. 64] DIPTERA OF CONNECTICUT : TAXONOMY 379 



da, mnndoidcs) or gray (nifibasis group), the latter group having the male 

 hypopygium with a series of teeth on margin of outer dististylc. producing 

 a comb-like appearance (Fig. 45, L, M) Prionolabls 



Wings with Ro^s+i longer (Fig. 44, B, C, E), usually exceeding the basal 

 deflection of R;, (compare irrorata) : Rs shorter, not exceeding three times 

 R-2+s+i (compare irrorata); body-coloration never polished black; when 

 gray, the male hypopygium without a comb of spines on the outer dististyle S 

 8. Rs short, weakly to more strongly angulated at origin, more rarely merely 

 arcuated (compare hi tea) ; /?2+3+4 subequal to or shorter than m-cu (Fig. 

 44. B) ; antennae short in both sexes Phylidorea 



Rs longer, more gently arcuated ; in species with Rs shorter (compare 

 poetica; laricicola; albipcs, niveitarsis) with antennae of male elongate, 

 and. except in poetica, with i?2+3+4 elongate, considerably exceeding m-cu 



Limnophila 



The various subgenera of Limnophila are highly artificial and are 

 chiefij' maintained for convenience only. The exact definition of the 

 limits of the subgenera Prlonolahis. Phylidorea, and Limnophila, s. s., 

 has proved especially difficult : 



Prionolahh^ as typified by ruf'ibasis, has a very distinct structure 

 of the male hypopygium, and the nearest allied species {simplex, 

 walleyi) are not apt to be traced elsewhere. The two polished black 

 species {inunda^ mundoides) have a very different hypopygial struc- 

 ture but in other features are referrable to Prlonolahis. 



Phylidorea^ as typified by jemiginea and a^usta^ includes a con- 

 siderable range of species, agreeing in the general structure of the 

 male hj^popygium. The venation usually shows Rs short and strongly 

 angulated to spurred at origin, but this character is closely approxi- 

 mated by a few^ species with elongate antennae in the male sex that I 

 do not think can be held as being consubgeneric with adusta (compare 

 Lrmnophila, s. s.). However, it should be borne in mind that some 

 species tliat are surely members oi Phylidorea {novae-angliae, siovana) 

 have relatively long antennae in the male sex, and there is a possi- 

 bility that the above-mentioned doubtfid species {laricicola\ alhipes. 

 niveitarsis) will eventually be placed in Phylidorea. All three of the 

 species named are very distinct in hypopygial and other characters 

 and are not a])t to be confused by the careful student. 



LJmnophila^ as treated for the Xortheastern Nearctic fauna, has 

 been made to receive the residue after the various species have been 

 assigned to other subgeneric groups. It is somewhat doubtful whether 

 any of the species here placed in Liinnophila., s. s., are strictly con- 

 subgeneric with the type, picfipennis Westwood, of Europe, the near- 

 est approach l)eing m irrorata. Besides the four species that approach 

 Phylidorea, as listed' in the above key, having elongate antennae in the 

 male sex, onlv two species are left in the group as now restricted. 

 Both of these" are readily told from all other Eastern species of the 

 genus by the diagnostic features. — hrevifurca by its very small cell ^Ii. 

 and irrorata bv its heavily and closely irrorate wing-pattern. 



A few crane-flies that presumably belong to the Hexatommi have 

 been described by earlier workers but have not been recognized in the 

 intervening years. 



Lvmnophila carhonaHa Macq. : Dipt, exot., 1:66; 1838. Unknown; 

 the only species known that agrees even approximately with the de- 

 scription is L. macrocera Say (1823). 



