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XVIII. Descriptions of some New Species of Hymenop 
terous Insects belonging to the Families Thynnide, Masa- 
ride and Apide. By Freperick Smita, V.P. Ent. Soc. 
[Read Ist May, 1861. ] 
Tue insects described in the present paper, with one or two ex- 
ceptions, are the property of F’, Du Boulay, Esq., who has placed 
them in my hands for examination. Amongst these are some of 
the finest species of the various genera to which they belong, 
particularly, I may point out, those of the rare genus Paragia, 
three new species of which add greatly to the interest of this 
small collection of Australian Hymenoptera, But the most 
remarkable insect described is a bee, belonging to the section of 
leaf-cutting bees; this I have characterised as forming a new 
genus (Thaumatosoma), principally from the circumstance of its 
possessing elongated capitate antenne ; I know but of one other 
instance in which a bee has true capitate antenne ; this is in a 
species of Tetralonia from Brazil.* 
Fam. THYNNIDZ. 
Genus THynnuvs. 
Thynnus ventralis. 
T. luteus; antennis abdominisque segmentis apicalibus nigris ; 
alis fuscis. 
Female.—Length 10 lines. 
Pale luteous, the antenne and tips of the mandibles black ; a 
transverse black line on the vertex, from which two angular 
stains emanate, each enclosing one of the posterior ocelli; the 
pit, in which the anterior ocellus is situated, is also black ; all the 
sutures of the thorax black; the wings dark brown; the basal 
joint of the tarsi more or less obscurely ferruginous, the rest of 
® A description of this species is given, post, p. 398. There are three 
genera of “ long-horned bees,’’ in which the males have their antennz fre- 
quently as Jong as, or in some cases even longer than, the body. The first 
genus established, Eucera, is at once known from the others by the species 
having only two submarginal cells in the anterior wings; the other genera, 
Tetralonia and Melissodes, have each three submarginal cells, but Tetralonia 
has 6-jointed maxillary palpi and 4-jointed labial palpi, whereas Melissodes 
has both maxillary and labial palpi 4-jointed. 
