49 

 Table of species of ECHTHRODELPHAX. 



1. (4) Thorax entirely, or all but the pronotum. black; wings 



without transverse bands. 



2. (3) Pronotum yellow E. fairchildii P. 



3. (2) Pronotum black E. nigricollis. 



4. (i) Thorax flavous or ferruginous; wings with two bands 



E. hifasciatus. 



I. Echthrodclphax faiirhildii P. 



Male. Black, the mandibles, the scape, and often the second 

 joint of the antennae and the legs, pale. 



Antennae very long and thin, the third and fourth joints sub- 

 equal, as also the following ones; scape about equal to the second 

 joint, and these two together subequal to the third. Head with 

 shining areas varying in different aspects. Mesonotum shining, 

 feebly punctured, with distinct furrows enclosing a triangular 

 space. Propodeum with reticulate rugulosity, the meshwork not 

 very dense. Abdomen black or pitchy, shining and smooth. 



The female has already been sufficiently well described. 



Hab. Hawaiian Islands; formerly on Kauai and Oahu only, 

 but has now been established on the other islands for economic 

 reasons. 



2. Echthrodclphax nigricollis sp. nov. 



Face, occiput, basal two and several apical joints of the an- 

 tennae, a median abdominal band (often discoloured after death) 

 and the legs, pale, yellow or testaceous. Eorm, size and sculp- 

 ture almost as in E. fairchildii. but distinguished at a glance by 

 the entirely black pronotum, and the reticulation of the propo- 

 deum is apparently more dense. Length 2-2.5 mm. 



Hab. Cairns, Queensland; bred. 



3. Echthrodclphax bifasciatns, sp. nov. 



Testaceous or ferruginous, abdomen black at the extreme 

 base; wings with a transverse, dark, narrow band at the apex of 

 the basal cells and a dark cloud or band beneath the basal por- 

 tion of the radial nervure. 



Antennae less slender than in the two preceding species. Head 

 above smooth and shining. Front lobe of pronotum smooth 

 and shining, the posterior dull, and with excessively dense and 

 minute microscopic sculptures; mesonotum smooth and shining; 



