56 



them by an obtuse impression, and with a more or less im- 

 pressed, sometimes paler, longitudinal median line ; tegmina 

 divergent, reaching the first dorsal abdominal segment, 

 rounded at apex, their exterior margin reflexed, the inner 

 (apical) margin oblique, angularly sinuate somewhat outside 

 the apex of the scutellum, clavus not separated from corium. 

 Length, 4-4*4 mm. 



Fifth Stage. — Distance between eyes five times broader 

 than an eye. Pronotum two times and a half broader than 

 long in the middle, in other points as in the fourth stage. 

 Scutellum as in the fourth stage ; tegmina directed backwards, 

 reaching a little beyond the base of the third dorsal abdominal 

 segment, broadly rounded at apex, the inner (apical) margin 

 parallel to the longitudinal axis of the body, arcuately sinuate 

 somewhat outside apex of scutellum ; structure of tegmina 

 otherwise as in the fourth stage. Length, 5 mm. 



Of this genus eight species are now known, five of which 

 occur in Australia. As Australian entomologists may find 

 G . nidicola or other species of the genus by examining opossum 

 nests when opportunity arises, I think it useful to give a key 

 to the Australian species with indications of the papers where 

 complete descriptions of them can be found : — 



1. (2) Head distinctly longer than broad 



and as broad as apex of pronotum, 

 sides of its postocular part 

 straight, ocelli somewhat distant 

 from the eyes, first antennal joint 

 passing apex of head by half its 

 length. Brownish testaceous, 

 antennae fuscous with the last 

 joint whitish, corium more or less 

 obscurely infuscated on disk 



2. (1) Head as long as broad or little 



longer, sides of its postocular 

 part rounded, ocelli contiguous to 

 the eyes or almost so. 



3. (4) First antennal joint passing apex 



of head by half its length. Pro- 

 notum at apex as broad as the 

 head. Ferruginous, including last 

 antennal joint, but membrane 

 fuscous with a whitish streak at 

 the exterior basal angle 



4. (3) First antennal joint scarcely or not 



much passing apex of head. 

 Ground-colour black. Membrane 

 fuscous, unicolorous. 



5. (8) Pronotum at apex conspicuously 



broader than head, its basal bor- 

 der yellowish. Last antennal 

 joint, except a narrow black basal 

 ring, very pale testaceous. 



apicicornis, Sign. 



ferruginea, Horv. 



