920 CHARLES PauL ALEXANDER 
Prescutal stripes dark brown; tuberculate pits lacking; r at the tip of Ri; basal deflection 
of Cu usually at or close to the fork of My. [Proc. Acad. Nat. Sci. Phila., p. 534-535, 
pli24, fig. 46) 1916:)2 (Blate ma, WS 7 ne oe ee ee L. sylvia Alex. 
44, Rs short, about equal to vein R: of the wings. [Proc. Acad. Nat. Sci. Phila., p. 241. 
T859!]5 (Plate Malas DDN ee Sy kee a NIE aor ee Ea L. lenta O. S. 
Rs elongate, equal to about twice the length of vein R2 of the wings................ 45 
45. Mesonotum and pleura yellowish or brownish yellow; wings pale yellow.. [Proc. Acad. 
Nat. Sci. Phila., p. 595-596, pi. 25, fig. 5. 1914.] (Plate XL, 155.) 
LL. stanwoodae Alex. 
Mesonotum and pleura not yellow............... 0.5.0 e eee e cee e eee eee eeees 46 
46. Pleura and mesonotum clear bluish black with a gray bloom, only the coxae conspicuously 
light yellow; wings with a yellowish tinge; cross-vein r beyond the fork of R:+3 on Re. 
[Proc. Acad. Nat. Sci. Phila., p. 241. 1859.] (Plate XL, 153.)......L. quadrata O. 8. 
Pleura and mesonotum not so colored; cross-vein r at or before the fork of Rot+3...... 47 
47. Pleura of thorax with a conspicuous black dorsal stripe; mesonotum rich brown; wings 
with a brown suffusion; antennae of male short. [Proc. Acad. Nat. Sci. Phila., p. 596, 
pli 25; fies 6. LOA =. (Plate x 1545). eye ee I. osborni Alex. 
Pleura of thorax without a black dorsal. stripe; mesonotum dull yellowish with three 
confluent dark brown stripes; wings without a distinct dark brown suffusion; antennae 
of male elongated. [Proc. Acad. Nat. Sci. Phila., p. 533-534, pl. 27, fig. 45. 1916.] 
(Plate; Xa 5G) eee OR Cea Ue ASS ea ace TO AAG a L. edwardi Alex. 
Tribe Hexatomini 
The genera of the tribe Hexatomini may be separated in accordance 
with the following key: 
1. Cell ist Mz open; but one free branch of the media reaching the- wing margin; cell Rz 
LUT aTy peor eR Nes Maze op EO aR CUES Recs) IR eRe cat HIE Hexatoma Latr. (p. 920) 
Cell 1st M2 closed; two or three free branches of the media reaching the wing margin; 
cell Ro larger; more“elongate: 3. eee 2 
2. Feet (in the local species) white; stigma small; cell M: present. 
Penthoptera Schin. (p. 921) 
Feet not white; stigma large; cell Mi present or absent.......... Eriocera Macq. (p. 921) 
Genus Hexatoma Latreille 
1809 Hezxatoma Latr. Gen. Crust. et Ins., vol. 4, p. 260. 
1818 Anisomera Meig. Syst. Beschr., vol. 1, p. 210. 
1818 Nematocera Meig. Syst. Beschr., vol. 1, p. 209. 
1836 Peronecera Curt. Brit. Ent., p. 589. 
The small genus Hexatoma includes seventeen described species, about 
all of which are European. They are mostly small species, with a reduced 
medial venation that is at first sight difficult to interpret; the manner 
in which this genus has been evolved from Eriocera is well shown in some 
of the plastic species of the latter genus, notably H. austera Doane, in 
which all gradations in venation between Eriocera and Hexatoma may 
be found in a small series. From species such as these it is seen that the 
elimination of the posterior branch of the media is brought about by 
