280 
Dü H. FRIESE 
the vertex, the face, and the clypeus have a distinct keel down the 
middle ; the face is punctured, except in the centre ; the clypeus is clo¬ 
sely, irregularly, longitudinally striated; its sides and apex are bordered 
by distinct keels. The base of the mandibles in the centre is rugose, 
and bordered above and below with keels: the apex of the mandibles 
is oblique. Mesonotum and scutellum closely punctured; the scutellum 
is slightly depressed in the middle; the post-scutellum is armed with 
two spines, which are stout, straight on the inner side, rounded above 
on the outer. The basal area of the median segment is longitudinally 
striated the striae are more widely separated in the centre than at 
the sides. The legs are thickly covered with griseous pubescence ; the 
calcaria are dark rufous; the scopa has white, mixed with longer, black 
hairs. Abdomen shining; the basal four segments banded with green, 
mixed with yellow on their apices ; the basal band is narrower than the 
others; the segments are closely punctured except at the apex; the 
basal is covered with white, the apical segments with longer, black hair ; 
the ventral segments are thickly covered with white hair. Median seg¬ 
ment at apex closely punctured, except for a triangular smooth space 
at the top. 
The cf is similarly coloured; the scutellum has the sides obliquely 
narrowed, and ends laterally in a short tooth; the scutellar spines are 
longer and narrower than in the £ ; the hinder femora are greatly swol¬ 
len; on the basal part above are two curves, the basal being the shor¬ 
ter and straighter ; the tibiæ are thickened, and broadly rounded on the 
outer side, the apex on the inner side is oblique; the greater part of 
the tibiæ behind, their apex, and the base of the tarsi are fulvous ; the 
tarsal spines are rufous.» 
Gazellen-Halbinsel auf Neu-Pommern. 
Xylocopa Perkinsi Camer. 
1901. — Xylocopa perkinsi J Cameron, Proc. Zool. Soc. London, I. p. 243. 
«In Willey’s «Zoological Results» (p. 388), Dr. Sharp has written 
the following remarks : — «Mr. R. C. L. Perkins has (Ent. Monthly 
Mag., Febr. 1899, p. 38) called attention to the very extraordinary sym¬ 
biosis of the 5 bees of the genus Koptorthosoma (Xylocopa) and certain 
Acarids ; the bee being provided with a special chamber in the abdomen, 
which is tenanted by the Acari. The c? c? do not possess this structure. 
Mr. Perkins mentions the remarkable fact that in this species from New 
Britain the female is destitute of the special chamber, though it exists 
in the closely allied K. aestuans. 
