TJymenoiAcra from the Khasia Ilills. 331 



is white, on the hack it is darker; the pygidial area is 

 rufous. 



Comes near to H. timidus and H. gutterosus. The male 

 is similar ; the apical half of the clypeus is pallid yellow ; 

 the flagellum of the antennse is fuscous beneath. The furrow 

 near the base of the mesopleune is wide and stoutly striated ; 

 the tubercles are fringed behind with white pubescence. 



This species is easily known by the violaceous wings, by 

 the strongly punctured head and thorax, and by the strongly 

 keeled prothorax and median segment. 



Halictus trincomalicus, sp. n. 



Dark blue, with brassy tints, thickly covered with white 

 pubescence ; the base of the median segment irregularly 

 longitudinally striated ; the apices of the abdominal seg- 

 ments brownish ; the anal rima dark brown ; the wings 

 hyaline, the stigma and nervures fuscous. ? . 



Length G mm. 



Hab. Trincomali, Ceylon {Col. Yerhury). 



Antennae stout, black, the ai)ical joint fuscous ; the scape 

 shining, covered sparsely with short pale hair. Head closely 

 and distinctly punctured ; the face brassy and more sparsely 

 punctured than the rest ; the base of the clypeus more 

 sparsely and less strongly punctured than the apical half, 

 which is dark purple. Mandibles ferruginous. Front in- 

 distinctly keeled. Pro- and mesothorax shining, punctured, 

 but not strongly or closely, and thickly covered with white 

 hair. Median segment closely and distinctly punctured ; 

 the striae on the base are irregular, longitudinal in the 

 middle, more oblique on the sides. Legs black ; the calcaria 

 testaceous ; the pubescence white, on the metatarsus fulvous. 

 Abdomen shining, impunctate ; the apices of all the segments 

 brownish ; the anal rima dark brown ; the apex of the anal 

 segment in the centre and laterally lighter, more testaceous 

 in colour ; the apex bears fulvous hair. 



Comes near to H. vernalis, Sm. 



Muiilla acidalia, Cam. 

 This species was described by me in Proc. Manch. Soc. 

 1897, p. 56, in both sexes, from Trincomali, Ceylon, where 

 they were taken by Col. Yerbury. The species has been 

 overlooked by Bingham, who does not mention it in his 

 work on Indian Hymenoptera. The species is probably, as 

 Andre suggests (Ann. Soc. Ent. Fr. 1899, p. 34), a form of 

 M. ceijlanensis , Siehel & Rad., Horae Soc. Eut. Ross. vi. 

 p. 247, of which M. hexapos, ISauss. (also from Ceylon), is 

 ccrtainlv a variety. 



