﻿75 



8a Frons raised, less distinctly sutured, tempora narrow and 

 very short, antennae inserted near the intero-anterior an- 

 gles of the eyes 2 Tharra 



Tharra. 



I separated this (Bull. 1 p. 324) from lassus by the possession 

 of two subapical cells and the absence of transverse veins in the 

 clavus ; the latter is of no value and the former is, I am inclined 

 to believe, accidental. It is possibly only a group of lassus, l;ut 

 for the present may be separated by the characters given in the 

 ke}-. Typical lassns also seems to have the apical margin of the 

 vertex forming more or less of a curve with the eyes. The only 

 species of lassus I have seen is represented by a pair of /. olitorius 

 Say, kindly given me by my friend, Mr. Van Dnzee. 



In Tharra hibena, kassiphone, etc., the median and brachial 

 veins are generally united by a straight cross vein at their bases, 

 this being united to the radial by an outwardly inclined oblique 

 vein ; but in T. kalypso and ogygia there is usually a common 

 longitudinal stalk for the median and brachial, which is united 

 to the radial b}' the oblique vein. This however is not constant 

 and moreover sometimes the stalk vanishes, and the median and 

 brachial unite at an angle. 



In all the species, the frons is not, or only faintly, medianly 

 keeled and the clypeus is not ampliate, though often a little widen- 

 ed, apically. 



The species (all Australian and Fijian up to the present) may 

 l)e disposed as follows : 



1 Vertex distinctly narrower at the base than at the anterior 



margin of the eyes, not flush with the eyes, lateral margins 

 gradually divergent. Anterior and middle legs bright 



orange yellow 5 kassiphone 



la Vertex little wider (if at all) at anterior margin of eyes 

 than basally, flush with the eyes, lateral margins parallel 

 or subparallel as far as the anterior margins of the latter. 

 Legs pallid or black 2 



2 Part of vertex produced before eyes not more than a third 



of the length of the basal part 3 



2a Part of vertex produced before eyes about two-thirds of the 

 length of the basal part 4 naiisikaa 



3 Tegminal veins bright sanguineous t labcna 



