XYLONOMUS. 79 



40. Xylonoinxxs abaddon, sp. u. 



5 . A dull black species, with the body profusely pale-iuarked 

 and the stigma basally pure white. Head cubical and posteriorly 

 not narrower than the internally parallel eyes ; vertex very broad 

 behind the ocelli and, like the frons, glabrous ; face subtrausverse, 

 closely and superficially punctate ; clypeus strongly transverse, 

 discrete, basally carinately elevated, apically broadly rounded and 

 centrally concave ; mandibles slender and apically edentate, their 

 base as broad as the length of the cheeks ; frontal and external orbits, 

 cheeks and whole face white. Antenna' slender, infuscate, with 

 the ninth to thirteenth fiagellar joints pure Avhite. the basal ones 

 stramineous and the scape entirely testaceous. Thorax black, with 

 the propleurte and prosternum entirely, the mesopleuraj broadly, 

 the callosities before and beneath the radices, and the apical half 

 of the metathorax (except below), testaceous; mesonotum distinctly 

 and somewhat finely punctate, with strong and crenulate notauli ; 

 metanotum obsoletely punctate, basal area elongate and triangular; 

 areola entire, pentagonal and longer than broad, emitting distinct 

 costulaj from its centre ; petiolar area broader than lono-, and 

 entire, with apophyses strongly acuminate ; spiracles elongate-oval; 

 metapleurte scabrous, Avith lateral carinse distinct. Scutellam and 

 postscutelhim flavous, the former not conxex, closely and obso- 

 letely punctate, Avith its apex subtruncate. Abdomen hardly 

 longer than the head and thorax, broadest behind the centre, 

 black, with the apices of all the segments bright tlavous and the 

 basal half of the first testaceous ; the three basal segments closely 

 and alutaceously punctate, transversely impressed before tlieir pale 

 apices, the first with no discal carinse, the second and third deeply 

 sulcate laterally, as well as obliquely from the side of the apex to 

 the centre of the base ; terebra nearly as long as the abdomen 

 with the valvuhe red and apically black. Zcr/s elongate and slender, 

 fulvous, with the anterior pairs paler and their coxae stramineous; 

 front tibiae basally sinuate : hind trochanters, extreme apices of 

 their femora, and of their tibia3 more broadly, subinfuscate, their 

 tarsi pure 'white, with the minute claws and ouychii blackish. 

 Wings clear hyaline, with the junction of the internal and external 

 cubital nervures, and of the basal nervures, infumate; teguhe 

 l^lack, radix pale, stigma and nervures piceous, with the base of 

 the former pure white ; median nervure not continuous throu"-h 

 the basal ; second recurrent strongly cur\ed, narrowly bifeues- 

 trate and emitted from the external cubital distinctly bevond its 

 junction with the internal ; hind wings with the first recurrent 

 but slightly postfurcal, emitting the strong nervellus froui a little 

 below its centre. 



Length 12 millim. 



Assam: Khasi Hills (Co?. Godwin-Austen). 



Type in the British Museum. 



The typical female, and a second of the same sex taken with it, 

 are the only specimens I have seen of this species. 



