28 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.64 



9. Genus HETEROMERINGIA Czerny. 



Heteromeringla Czerny, Wien. ent. Ztg., vol. 22, p. 72 (1903). — Kertesz, Ann. 

 Mus. Nat. Hung., vol. 1, p. 567 (1903).— Johnson, Psyche, vol. 20, p. 98 

 (1913).— Malloch, Proc. Ent. Soc. Wash., vol. 20, p. 7 (1918). 



Liinule covered; three fronto-orbitals, the front pair convergent, 

 no cruciates, postverticals present, ocellars distinct, no prothoracic, 

 two posterior dorsocentrals, no prescutellars, apical scutellars con- 

 vergent, no preapicals; crossveins approximate. 



Genotype. — H. nigrimana Loew, the single original species. 



The inclusion of Williston's West Indian species, H. valida and 

 limthalis, which have a preapical bristle on the middle tibiae, made 

 this genus poorly defined. Moreover, these species have the neura- 

 tion different from Heterorneringia, the crossveins being more widely 

 spaced. The removal of the disturbing species to Soharocephala 

 leaves the genus Heterorneringia as clearly cut as the others of this 

 family. 



KEY TO THE SPECIES OF HETEROMERINGIA. 



1. Wings with subbasal and apical clouding and central paler fascia; foremost buccal 



hair vibrissa-like; arista loosely pubescent or short-plumose 2 



Wings uniformly darkened or with apical cloud; one vibrissa; arista closely 

 pubescent 4 



2. Legs wholly yellow, the middle tibiae sometimes with extremities brownish and 



front tarsi sometimes dusky. (West Indies, Fla.) flavipes Williston. 



Legs otherwise pictured 3 



3. Hind femora and tibiae tipped with dark ring; apical cloud entirely beyond end 



of fifth vein; lower pleurae yellow. (N. Car.) annulipes Johnson. 



Front tarsi and hind tibiae, and in female front tibiae also, black; apical cloud 

 occupying nearly distal half of wing; pleurae wholly black; anterior half of male 

 front opaque, pruinose when viewed from before. (Peru; C. Amer.) 



czernyi K 



4. Front legs except coxa and sometimes base of femur black 5 



Anterior femora and middle tibiae black, rest of legs yellow; wings dark except at 



base; head black. (Peru) nigrifrons Kertesz. 



5. Hal teres blackish; posterior legs yellow, only their coxae dark at base; cheeks 



mostly yellow. (Eur.) nigrimana Loew. 



Hal teres white; posterior legs variable, usually yellow in Eastern United States 

 specimens, sometimes femora and sometimes tibiae more or less darkened; 

 cheeks mostly black 6 



6. Wings with an apical cloud especially pronounced along costa; opaque anterior part 



of male front leaving a cordate smooth spot surrounding ocelli, {nitida 



Johnson) 7 



Wings dark except costal portion of base ; opacity of male front restricted to anterior 

 portion; distal third (male) or less (female) of hind femora and the hind tibiae 

 black. (Costa Rica) fumipennis, new species. 



7. Posteriorlegsnearly or wholly yellow; front black; male palpi yellow, female palpi 



black with yellow tip. (Eastern U. S.) nitida Johnson, s. str. 



Posterior femora and tibiae more or less blackened; male front reddish above 

 antennae; palpi black except whitish tip. (U. S.) 



nitida, form nigripes, new variety . 



