12 Philippine Journal of Science wis 



Male. — Antennae very long, black; face green; abdomen slen- 

 der, black; tarsi, and anterior tibiae in front, ferruginous. A 

 male from Mount Banahao is considerably larger than one from 

 Mount Maquiling. 



Luzon, Mount Maquiling {Baker), type and varieties a and 

 b; Imugan {Baker), variety c; Mount Banahao {Baker), male. 

 Very variable, but apparently all one species. I have nine 

 specimens before me. 



Halictus imuganensis sp. nov. 



Female. — Length, about 7 millimeters; bright golden green, 

 the clypeus, mesothorax, and scutellum variably suffused with 

 coppery red, or entirely green, or the clypeus peacock green; 

 mandibles obscure reddish; face, front, mesothorax, and scu- 

 tellum with a roughened granular surface ; antennae black ; area 

 of metathorax shining, with strong, irregular plicae, forming a 

 coarse irregular network; posterior truncation sharply denned 

 at sides; thorax above with thin ocherous hair; tegulae rufo- 

 piceous ; wings very faintly dusky ; stigma black ; second submar- 

 ginal cell large and broad, receiving first recurrent nervure at 

 its apical corner; outer transverse cubital and recurrent ner- 

 vures weakened; legs black; abdomen shining, without bands; 

 a well-developed ventral scopa. 



Luzon, Imugan {Baker), type locality. Mount Banahao 

 {Baker) : Baguio, Benguet {Baker) . Five specimens are be- 

 fore me. Allied to H. taclobanensis. 



Halictus adonidiaa sp. nov. 



Female. — Length, about 6.5 millimeters; shining green, with 

 dark tarsi, tegulse rufotestaceous, and basal half of scape red. 

 Closely allied to H. imuganensis Cockerell, differing in the color 

 of scape, the bluish green (not brassy green) abdomen, the 

 broader head, the scutellum and posterior half of mesothorax 

 brilliantly shining, and the paler (brownish) stigma. 



Luzon, Manila, Malate {R. C. McGregor), October 27, 1918, 

 at flowers of Adonidia merrillii Beccari. 



Halictus cyanescens sp. nov. 



Male. — Length, a little over 5 millimeters; head, thorax, and 

 abdomen blue-green ; face and front, including clypeus, dull and 

 granular; antennae black; mesothorax granular; area of meta- 

 thorax irregularly reticulate; posterior truncation sharply de- 

 fined at sides; tegulae ^testaceous ; wings very faintly dusky, 



