TIUCLISTUS. 301 



often_ suleate before the ocelli ; vertex elevated and tlio verv 

 prominent face strongly puiictafe ; mandibles dejilanate and 

 basally broad ; eyes oblong, externally slightly sinuate and 

 internally somewhat emarginate next the SL-robes. Flagellum a 

 little attenuate basally, with its first joint cylindricair Meta- 

 tlioracic spiracles circniar, and the sternum basally bilid between 

 the intermediate coxa?. Abdomen smooth and nitidulous ; apical 

 ventral segment of 2 broad and apically emarginate, entin^lv 

 concealing the terebra and sometimes extending to the apex of 

 abdomen. Femora strongly incrassate ; hind calcaria somewhat 

 sfout, with the internal calcar nearly half the length of the 

 metatarsus. Areolet entire, rarely with its external nervure 

 ])ellucid, and generally shortly petiolate. 



liauge. Europe, India, Burma, Ceylon, and Xorth America. 



This genus is distinguished by having a more or less distinct 

 areolet, the areola and central lateral metanotal area^ not discrete, 

 the nervelhis intercepted at its basal third, the second abdominal 

 segment not discally carinate, the basal flagellar joint distinctly 

 longer than the second, and the abdomen sessile, with the spiracles 

 of its basal segment somewhat before the centre. 



Cameron appears to have used the genus Exochns in its older 

 and broader sense, with the result that it is now difficult to assign 

 to their more modern genera the insects set out in his earli'^'i- 

 descriptions. 



TahJe of Species. 



1 (6) Face and frontal orbits imiuaculate. 



-' (3) Abdomeu entirely red dt'muIiatMs, sp. n., p. HOI . 



o (2) Abdomeu entirely black. 



4 (5) Areola slightly longer than broad ; 



length 7 niillim aif/.-co/i, Cam., p. 302. 



o (4) Areola twice as long as broad ; length [p. 303. 



4 niillira curvicnrinutus, Cam., 



0(1) En tn-e face and frontal orbits pale .. iw///(///Vo«.';, sp. u., p. 304. 



21.'3. Triclistus dimidiatus, sp. n. 



5 . A conspicuous red species, with the head and thorax black. 

 Head immaculate and not strongly constricted behind the internal I v 

 broadly emarginate eyes; occiput abruptly sloping and hordei-ed 

 below; vertex narrow; frons distinctly 'and sparsely punctate, 

 apically produced into a longitudinal horn between the distinct' 

 scrobes; mouth-parts partly rufescent. Antenna' filiform and a 

 hltle longer than half the body, dull fulvous, becomin^r paler 

 basally, \\ith the scape fiavesceiit. Thora.,' black, evenly pun.-talc 

 and nitidulous; notauli wanting ; mesonotum apically produced • 

 all the pleura) absolutely glabrous juul strongly 'nitidulous • 

 metanotum obsoletely punctate, with the petiolar area very short 

 and basally entire: areola i)arallel-sided, fully twice as long as 

 broad, with no costula>, but the carina^ both above and below the 



