920 Charles Paul Alexander 



Prescutal stripes dark brown; tuberculate pits lacking; r at the tip of Ri] basal deflection 

 of Cui usually at or close to the fork of Mi. [Proc. Acad. Nat. Sci. Phila., p. 534-535, 

 pi. 27, fig. 46. 1916.] (Plate XL, 157.) L. sylvia Alex. 



44. Rs short, about equal to vein R2 of the wings. [Proc. Acad. Nat. Sci. Phila., p. 241. 



1859.] (Plate XL, 152.) 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.) 



L. stanwoodae Alex. 

 Mesonotum and pleura not yellow 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 Ri-^, 3 on R^. 



[Proc. Acad. Nat. Sci. Phila., p. 241. 1859.] (Plate XL, 1.53.) L. quadrata O. S. 



Pleura and mesonotum not so colored; cross-vein r at or before the fork of R2+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, 



pi. 25. fig. 6. 1914.] (Plate XL, 154.) L. o/^borni 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, pi. 27, fig. 45. 1916.] 

 (Plate XL, 156) L. edwardi Alex. 



Tribe Hexatomini 



The genera of the tribe Hexatomini may be separated in accordance 

 with the following key: 



1. Cell 1st Mi open; but one free branch of the media reaching the wing margin; cell Ri 



tiny Hexatoma Latr. (p. 920) 



Cell 1st M2 closed; two or three free branches of the media reaching the wing margin; 

 cell Ri larger, more elongate 2 



2. Feet (in the local species) white; stigma small; cell Mi present. 



Penthoptera Schin. (p. 921) 

 Feet not white; stigma large; cell Mi present or absent Eriocera Macq. (p. 921) 



Genus Hexatoma Latreille 



1809 Hexatoma Latr. den. Crust, et Ins., vol. 4, p. 260. 



1818 Anisomera iMeig. Syst. Beschr., vol. 1, p. 210. 



1818 Ncmalocera 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 E. austera Doane, in 

 which all gradations in venation between Eriocera and Hexatoma may 

 be found in a small scries. From species such as these it is seen that the 

 elimination of the posterior branch of the media is brought about by 



