17,2 Cockerell: Bees from Sandakan, Borneo 227 
bakeri, but this cannot be, as the mesothorax has large punctures 
like those of H. sauteri, the wings are clear, and the hair at 
sides of face, on scutellum, etc., is pale fulvous. The antennae 
are slender, but not so long as in H. othonis Friese, from Java. 
The upper part of truncation of mesothorax is polished and bril- 
liantly shining. 
Borneo, Sandakan ( Baker 9972). The second submarginal 
cell is shorter than in the European H. truncarum (Linn.), and 
the second recurrent nervure joins it very near the end. 
Genus CERATINA Latreille 
Ceratina collusor Cockerell, variety a. 
Male . — Nearly agrees with type from Singapore, differing in 
that the scape has only one yellow spot (the lower one), and 
there are some punctures between the parapsidal grooves and 
the lateral yellow lines on mesothorax. Those may represent 
mere individual variation. 
Female . — Like C. philippinensis nigrolateralis Cockerell, from 
Palawan, but differing thus : Labrum with a yellow spot ; upper 
part of clypeal mark much larger and broader, emarginate at 
upper end; second submarginal cell smaller; first abdom- 
inal segment with a broad yellow hind margin, on which are 
two black spots; band on second segment entire, on third nar- 
rowly interrupted. There is no yellow spot behind the tubercles. 
The bands at sides of face are long. The hind tibiae are yellow 
at base, and have a small sharp spine on outer side near end 
of first third. There is a similar spine in nigrolateralis. 
Borneo, Sandakan {Baker 9973). Ceratina collusor was de- 
scribed from the male, nigrolateralis from the female, but they 
are evidently very closely allied. The Bornean insect is collusor; 
perhaps a slightly modified race. 
Ceratina flavonitens sp. nov. 
Male. — Length, about 5.5 millimeters; shining, black, with 
the following parts bright chrome yellow: Labrum, mandibles, 
broad band behind whole length of eyes, clypeus except narrow 
band on each side, subtriangular supraclypeal mark, spots on 
front, inner orbits to vertex (the upper half of the band slender) , 
prothorax with tubercles, mesopleura (black in front), meta- 
thorax (basal middle black), four stripes on mesothorax, scutel- 
lum, postscutellum, legs except hind tibiae (which are black, 
with base and apex yellow), first abdominal segment except 
two very large black marks, bands on segments 2 to 6, and 
