DIPTERA. 45 
Tapanus sociAtis, Fem. 
Cinereus, pectore cano, abdomine ferrugineo, antennis basi pedibusque 
fulvis, alis subcinereis basi et ad costam fulvis. 
Body gray: head brown above, tawny in front, clothed with white 
hairs beneath : eyes red, parted above by a narrow interval ; all the facets 
very small: sucker black; lancets ferruginous; palpi yellow: feelers dark 
tawny at the base: a tawny tinge on each side of the chest: breast hoary : 
abdomen pale ferruginous, obconical, clothed with short tawny hairs, very 
much longer than the chest: legs tawny; feet black ; foot-cushions pale 
tawny ; hind shanks clothed with very short black hairs: wings slightly 
gray, tawny at the base and along three-fourths of the length of the fore 
border ; wing-ribs ferruginous ; veins black, ferruginous at the base; 
curve near the base of the tip cross-vein, but no angle nor stump ; scales dark 
tawny; poisers pale ferruginous. Length of the body 8 lines; of the 
wings 16 lines. 
Cape. 
TaBANUs INFANS, Fem. 
Niger, capite abdomineque cinereis, abdominis segmentorum maryinibus 
posticis fulvis, antennis ferrugineis basi fulvis apice nigris, pedibus 
nigris, tibiis fulvis, alis subcinereis. 
Body black, tinged with gray: head gray, with a tawny tinge in front, 
clothed beneath with whitish hairs, adorned above with two black, shining, 
convex marks, the ove slender and forming a ridge, the other round: eyes 
brassy, parted above by a rather broad interval ; all the facets very small: 
sucker black; lancets pale ferruginous; palpi tawny: feelers tawny ; third 
joint ferruginous, oval, with no horn; compound joint black, slightly 
curved upward, rather shorter than the third joint: abdomen gray, obconi- 
cal, thinly clothed with short tawny hairs, a little broader and very much 
longer than the chest; hind borders of the segments tawny: legs tawny, 
clothed with short black hairs; thighs and feet black ; four hinder feet 
tawny towards the base ; fore-shanks black towards the tips ; foot-cushions 
dark tawny : wings slightly gray ; brands brown; wing-ribs ferruginous ; 
veins black ferruginous towards the base; a distinct obtuse angle with no 
