TRICLISTUS. 301 



often sulcate before the ocelli ; vertex elevated and the very 

 prominent face strongly punctate ; mandibles deplanate and 

 basally broad ; eyes oblong, externally sligbtly sinuate and 

 internally somewhat emarginate next the scrobes. Flagellum a 

 little attenuate basally, with its first joint cylindrical. Meta- 

 thoracic spiracles circular, and the sternum basally bifid between 

 the intermediate coxae. Abdomen smooth and nitidulous ; apical 

 ventral segment of 5 broad and apically emarginate, entire! v 

 concealing the terebra and sometimes extending to the apex of 

 abdomen. Femora strongly incrassate ; hind calcaria somewhat 

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

 metatarsus. Areolet entire, rarely with its external nervum 

 pellucid, and generally shortly petiolate. 



Range. Europe, India, Burma, Ceylon, and North America. 



This genus is distinguished by having a more or less distinct 

 areolet, the areola and central lateral metanotal areoo not discrete, 

 the nervellus intercepted at its basal third, the second abdominal 

 segment not diseally 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 Evoclius 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 earlier 

 descriptions. 



Table of Species. 



1 (6) Face and frontal orbits immaculate. 



'1 (3) Abdomeu entirely red dimidiatits, sp. n., p. 301. 



3 (2) Abdomen entirely black. 



4 (5) Areola slightly longer than broad ; 



length 7 millim aitkeni, Cam., p. 302. 



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



4 millim curvicarinatus, Cam., 



6 (1) Entire face and frontal orbits pale .. pallidij'rons, sp. n., p. 304. 



215. Triclistus dimidiatus, sp. n. 



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

 Head immaculate and not strongly constricted behind the internallv 

 broadly emarginate eyes ; occiput abruptly sloping and bordered 

 below ; vertex narrow ; frons distinctly and sparsely punctate, 

 apically produced into a longitudinal horn between the distinct 

 scrobes ; mouth-parts partly rufescent. Antennce filiform and a 

 little longer than half the body, dull fulvous, becoming paler 

 basally, with the scape flavescent. Thorax black, evenly punctate 

 and nitidulous ; notauli wanting; mesonotum apically produced; 

 all the pleurao absolutely glabrous and strongly nitidulous ; 

 metanotum obsoletely punctate, with the petiolar area very short 

 and basally entire ; areola parallel-sided, fully twice as long as 

 broad, with no costuke, but the carinte both above and below the- 



