HYMENOPTERA. 55 



segment laterally a patch of griseous pubescence ; the sides 

 have a scattered griseous pubescence ; beneath, the margins of 

 the segments piceous. 

 Hab. Sierra Leone. 



62. Halictus aurifrons, n. s. B.M. 



Male. Length 2\ Unes. — Black, the face covered vyith a 

 golden pubescence, the flagellum fulvous beneath, mandibles 

 ferruginous at their apex, the clypeus not produced. Thorax, 

 above a thinly scattered golden-colom-ed pubescence, the post- 

 scutellum and sides of the metathorax covered with white pu- 

 bescence ; beneath, the pubescence is pale yellow ; the wings 

 hyaline, iridescent, the tegulae and nervures pale testaceous ; legs 

 rufo-piceous, the tarsi and knees pale ferruginous. Abdomen 

 ovate, nigro-piceous, on the apical margins of the three basal 

 segments laterally an angidar patch of white pubescence. 

 Hab. Sierra Leone. 



63. Halictus productus, n. s. B.M. 



Male. Length 4 lines. — Black, head and thorax closely and 

 moderately punctured, sides of the face covered with a downy 

 pale fulvous pubescence, the clypeus very much produced, ex- 

 tending beyond the eyes half then* length, and having a number 

 of large punctures ; the antennae subclavate ; the fi-ont of the 

 thorax covered with a yellow downy pubescence ; wings subhya- 

 ILne, their apex fuscous, nervures pale ferruginous ; beneath, the 

 thorax has large scattered punctures, and is covered with an 

 ashy pile ; legs dark rufo-testaceous, the apical joints of the tarsi 

 ferruginous, theii- pubescence pale fulvous, the basal joint of the 

 tarsi beneath is bright fulvous. Abdomen clavate, rufo-fuscous 

 towards the base, the apical margins of the segments pale testa- 

 ceous and having a silvery pubescence placed transversely, cross- 

 ing which are a few long pale hairs. 



Obs. The single specimen from which the above description 

 was di'avvTi, differs from the typical neuration of the genus, but 

 possibly it may be merely a variety ; both the recurrent nervures 

 are received by the third submarginal cell. 



Hab. Sierra Leone. 



64. Halictus clavatus, n. s. B.M. 



Male. Length 2| lines. — Head and thorax black, closely and 

 finely punctured, antennae fulvous beneath, the face covered with 

 a silvery white pubescence. Thorax, the wings hyaline, their 

 apex having a fuscous cloud, the tegulae and nerviu-es rufo- 



