Hymenoptera. 87 



"with testaceous, and fringed with yellowish - grey pubescence. 

 Legs dark reddish-brown, sometimes with a darker line above, and 

 clothed with long yellowish- grey pubescence. Wings iridescent 

 hyaline, with yellowish-brown neui'ation. 



Four specimens, from north part of island, January, 1898. 



This insect agrees very well with Lieut. - Col. Bingham's 

 description of the female from Tenasserim, which he doubtfully 

 refers to M. proteus, Vachal ; but I cannot regard it as Vachal's 

 species, which is described as having the " metanotum (post- 

 scutellum) tomento croceato tectum." It is black in the Christmas 

 Island specimens, bordered with grey pubescence. But it is 

 possible that the male, which Bingham doubtfully refers to the 

 same species, may be Vachal's insect. However, as I have no 

 specimens of these Halicti to compare, and as the Christmas 

 .Island species would in any case require to be renamed, I have 

 named it after my friend Lieut. -Col. Bingham, whose book on the 

 Aculeate Hymenoptera of India is so useful to all who have 

 occasion to study foreign Hymenoptera. 



10. MegacMle rotundipennis, sp.n. 



(J long. corp. 9 mm.; exp. al. 17 mm. ^ long- corp. 12 mm.; 

 exp. al. 21 mm. 



Male. — Head transverse, very finely punctured, fully as wide as 

 thorax ; mandibles and lower part of head black ; mouth-parts 

 more or less ferruginous in rubbed specimens, but in fresh 

 specimens the face, like the greater part of the head and thorax, 

 is clothed with pale fulvous pubescence. Eyes with their inner 

 orbits obliquely approximating below ; abdomen black, the seg- 

 ments banded behind with brighter fulvous pubescence, and the 

 two apical segments densely clothed with the same above. Legs 

 black, clothed with long grey hair, with a slight fulvous shine : 

 front tarsi beneath, and at the tips, ferruginous ; middle and hind 

 tarsi thickly clothed with fulvous pubescence beneath, darkest in 

 the latter. Wings hyaline, slightly clouded towards the margins; 

 nervures brown ; wings rather broad, and the fore wings obtusely 

 rounded at the tips. 



Female similar, with the abraded thorax much more coarsely 

 punctured than the head, and the abdomen clothed with fine 

 golden-grey pubescence ; the last segment above clothed with 

 thick fulvous pubescence; the abdomen beneath coarsely punctured, 

 and clothed, especially towards the extremity, with long, recumbent, 

 fulvous hair; the greater part of all the tarsi likewise thickly 

 clothed with bright fulvous hair. 



Described from five males and one female, from Flying Fish 

 Cove, August and September, 1897, and West Coast, October, 1897. 

 On the flowers of forest trees (especially Grewia) ; rather scarce. 



