218 Timehrt. 
than wide, the apex transverse. Abdominal petiole as long as the scutellums 
and metanotum united and longer than the 2nd and 3rd segments united ; it 
is narrow, with prominent, projecting spiracles near the middle; the part 
behind these a little narrower than the apical. Female. Length 20 mm. 
The dense pubescence gives the insect a greyish appearance ; that on the 
face, clypeus and outer orbits is denser and silvery. The 4th and following 
joints of the antenne are dark rufous, below, the 9th, 10th and 11th are keeled 
in the middle and with a shallow, oval dark coloured depression on either side. 
Megacanthopus longipetiolatus, sp.n. 
Black, the apex of the pronotum narrowly all round and a small and a larger 
irregular mark on the mesopleure dull brown ; the coxe and femora tinged 
with rufous, the anterior brighter coloured than the others ; the underside of the 
the antenne brownish red, wings fuscous violaceous, highly iridescent, the 
stigma and nervures black; the basal abscissa of the radius nearly as long 
as the 2nd and 8rd united ; the 2nd one third of the length of the 4th and one 
third less than the space bounded by the recurrent nervures; the 2nd recurrent 
nervure broadly roundly curved outwardly; the 3rd transverse cubital broadly, 
roundly, obliquely curved backwards. Head and thorax opaque, densely 
covered with short black pubescence. Metanotal furrow commencing at the 
end of the basal fourth ; it is not very deep, its top wider than usual, half the 
width of the apex, broadly rounded ; there is a fine keel down the centre. 
Base of thorax bluntly rounded. Petiole as long as the thorax. Female. 
Length 18 mm. 
Costa Rica. 
The hair on the clypeus is long and dense, longer and denser below than 
above. Clypeus about one-fourth longer than wide ; its apex broadly rounded. 
There is a silvery pile under the pubescence. 
Nectarinia, Shuckard. 
The name Nectarinia, given by W. E. Shuckard to the South American 
Honey-making wasps was used in 1811 by Iliger for a bird genus. In 1904, 
on that account, R. von Ihering, Revista Musen Paulista, VI, 1904, renamed 
it Caba. R. du Buyssou, in his Monograph of the genus, does not adopt Caba 
on the ground that Nectarinia has practically lapsed in Ornithology ; but he 
spells it Nectarina. It is the Brachygaster of Pertey, a name pre-occupied. 
Nectarinia scutellata, Spinola. du Buyssou, Ann. Soc. Ent. Fr. 1905, 547. 
Potaro May. 
The abdominal bands are pale yellow, not orange like the scutellum. 
Nectarinia bilineolata, Spin. DaBuyssou, l.c., 531. 
In one specimen the head markings are greatly reduced and the thoracic 
lines absent ; in another there are neither head nor thoracic spots and the 
abdominal lines are not incised and narrower than usual, as in the var. Mobi- 
ana, Saus. 
