202 Mr. T. D. A. Cockerell on 
the others rugose. Pubescence white (except on tarsi behind, 
where it is orange), quite abundant on hind legs, pleura, and 
sides of metathorax. Mouth-parts greatly elongated; galea 
about 6 millim., second joint of labial palpus fully 4 millim., 
the third and fourth joints extremely minute ; maxillary palpi 
six-jointed, the first joint long, stout, and dark-coloured, the 
last four short and subequal, these palpi not enlarged ; man- 
dibles black, bidentate at apex, produced into a tubercle 
outwardly near base and into atooth beneath. Legs ordinary ; 
spurs of hind tibie black, one longer than the other. 
Hab. Bartica, British Guiana, May 21, 1901 (R. J. Crew). 
Sent by Mr. E. 8. G. Titus, and named after him in 
recognition of his work on bees. Allied to C. pubescens, 
Smith, but differs in the colour of the wings and thorax. 
C. Titusi, by reason of the greatly produced mouth-parts 
and the peculiar mandibles, will form the type of a new sub- 
genus, which may be called Crewedla. 
Ceratina Crewt, sp. n. 
? .—Length slightly over 7 millim. 
Shining dark blue-green (Prussian green), the clypeus with 
a large, upright, wedge-shaped, cream-coloured mark, but no 
light colour on orbital margins or cheeks; antenna: short, 
black, flagellum slightly reddish beneath; head and thorax 
strongly punctured, mesothorax with the punctures small and 
close; arather small, more or less U-shaped, smooth area ; 
extreme base of metathorax longitudinally plicatulate ; pleura 
with short white hair; tegule shining very dark brown ; 
wings subhyaline, dusky, nervures dark, stigma narrow, 
second submarginal cell much contracted above ; legs black, 
the femora more or less bluish, hind femora keeled and sub- 
angulate beneath ; extreme tips of tarsi ferruginous ; abdomen 
with the first segment smooth except on the apical middle, 
where it is roughened; second to fourth segments punctured, 
the punctures smallest and closest on second, largest on 
fourth; fifth and apical segments rugose. 
Hab. Bartica, British Guiana, May 21,1901 (2. J. Crew). 
Sent by Mr. Titus. Closely related to C. dupla, Say, but 
the scutellum is much more closely punctured in the middle 
than in that species, and there are other differences in detail. 
At Georgetown, British Guiana, March 28, 1901, Mr. Crew 
took a specimen of Ceratina bicolorata, Smith, a species 
hitherto recorded only from Brazil. 
