270 MEMOIRS OF TEE QUEENSLJND MUSEUM. 



sides rounded; the first segment is tlie 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 tibi;e with one spur, the hinder 

 apparently without any. Pronotuni and base of mesouotum finely punctured, the rest of the 

 latter finely, closely transversely striated. 



Hind tibiffi with some bristles behind, very indistinct and confused with hair. Antennae 

 thickened toward apes, 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 

 diilers 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 ha.s 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 ))ronotuni, 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 strise 

 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. Propleurse distinctly closely striated, the striae roundly curved. Meso and 

 metajdeurEe smooth, or faintly aciculated, and shining. Basal half of abdomen smooth, the 

 apical aciculated. 



Pubscence short and very spTrsc, longer and denfer on tibia^. Ovipositor broad, obliquely 

 directed upwards from the ventral to dorsal surface, its apex projecting shortly above the 

 back. 



Hahitdt: Gosford, New- South Wales."" 



This is certainly a most i)eculiar form for this family. It is most probably misplaced. 



Tribe ISOSOMINl. 



Genus ISOROMA Walker. 



1. ISOSOMA EAVOLA Walker. Male ; female. 



Walker, Is:!',), j.p. 4-.5. 



"Mas. Atrum, antennae nujrae, frons Ihini. iitdtlinrdcis latera antica //(fro nitwuhita, 

 pcde.t nijjro-picei, tarsi fiilvi, alae liiniridae. 



Atrum: capitis frons flava : oculi et ocelli rufi : antennae nigrae: prothoracis latera 

 antica flavo maculata: pedes nigri; trochantercs picpi ; genua fulva; tibia; picea;, apice 



