270 MEMOIRS OF THE QUEENSLAND MUSEUM. 
sides rounded; the first segment is the largest, not quite as long as the following three 
united, the fourth and fifth longer than the preceding two; the ovipositor short, broad, 
projecting upwards. Wings with a large cloud in front shortly beyond the middle; marginal 
vein twice the length of the postmarginal, which is not quite as long as the stigmal branch; 
the latter cleft at the apex; the lower division the larger, it is thicker and triangular. Legs 
stout, the hinder longer and thicker than the others; middle tibiz with one spur, the hinder 
apparently without any. Pronotum and base of mesonotum finely punctured, the rest of the 
latter finely, closely transversely striated. 
Hind tibizw with some bristles behind, very indistinct and confused with hair. Antenne 
thickened toward apex, pedicel narrowed toward base, twice longer than wide at apex; funicle 
3 longer than wide, 4 and 5 as wide as long, the others wider than long. Number of joints in 
club uncertain, counted as two and no ring-joint; therefore antenna 11-jointed. 
The pronotum is shorter and narrowed in front as compared with Decatoma, it also 
differs in the mesonotum and scutellum not being umbilicately punctate, in the marginal vein 
being longer and not thickened, and the abdomen sessile, not with a distinct peduncle as in 
Decatoma. When the male has been discovered, the species may be removed from the 
Decatomini, of which it has hardly the facies.’’ 
1. CRATODECATOMA RUFICEPS Cameron. Female. Genotype. 
Length, 5 mm. 
‘‘Black; head, apex of pronotum, almost the basal half of mesonotum, basal abdominal 
segment entirely and the sides of the second and third, red; antennal scape and the following 
two joints of a paler red; legs black, tarsi rufo-testaceous, their last joint black; wings hyaline, 
a large fuscous cloud at the middle, extending from the base of the marginal to the end of 
the postmarginal vein and enclosing the stigmal vein; narrowed at the costa, becoming roundly 
widened to apex, i.e., posteriorly, which is roundly transverse and extends shortly beyond the 
middle. Head closely, finely punctured, occiput more finely punctured than the rest. Pronotum 
finely, closely, transversely punctured, mesonotum more strongly transversely striated, the 
center more strongly than the sides. Basal half of scutellum finely, closely striated, the striz 
broadly rounded; the apical more strongly transversely striated, except extreme apex which 
is smooth. The raised broadly rounded, central part of the metanotum smooth, the basal lateral 
part aciculated. Propleure distinctly closely striated, the striwa roundly curved. Meso and 
metapleure smooth, or faintly aciculated, and shining. Basal half of abdomen smooth, the 
apical aciculated. 
Pubscence short and very sparse, longer and denser on tibiz. Ovipositor broad, obliquely 
directed upwards from the ventral to dorsal surface, its apex projecting shortly above the 
back. 
Habitat: Gosford, New South Wales.’’ 
This is certainly a most peculiar form for this family. It is most probably misplaced. 
Trine ISOSOMINI. 
Genus ISOSOMA Walker. 
1. ISOSOMA RAVOLA Walker. Male ; female. 
Walker, 1839, pp. 4-5. 
‘‘Mas. Atrum, antennae nigrae, frons flava, prothoracis latera antica flavo maculata, 
pedes nigro-picei, tarsi fulvi, alae limpidae. 
Atrum: capitis frons flava: oculi et ocelli rufi: antennae nigrae: prothoracis latera 
antica flavo maculata: pedes nigri; trochanteres picei; genua fulva; tibia picew, apice 
