XXI. CRABRO. 141 
ones piceous ; the anterior tarsi ciliated, and all the tibice spi- 
nose. 
The abdomen black, ovate, with five yellow bands more or 
less interrupted, the second generally least so, frequently en- 
tire, the fifth always entire, and the third seldom or never, but 
formed generally of two ovate transverse spots; the terminal 
segment black, produced into a groved obtuse spine, on each 
side of which it is covered with rigid golden sete. 
The ¢ differs in having the underside only of the scape 
yellow, the pedicel and two following joints fuscous beneath, 
and the 3—6th joints emarginate, and each produced into a 
tooth at the apex, the third joint shorter than the following, and 
most slender of all, the division between it and the following 
to be observed under a high power, the fourth much curved 
below, concave, and the largest, when viewed laterally much 
swollen in the centre, the following joints gradually decreas- 
ing in length, but the five last subequal and cylindrical; the 
clypeus, interior orbits of the eyes, and lower portion of the 
cheeks, densely covered with a silvery pubescence ; mandibles 
entirely black; the punctures of the base of the dorsolum 
interspersed with longitudinal strize; the metathoracic lines 
of demarcation less evident, from the interstices being more 
strongly sculptured, whence it appears irregularly reticulated, 
and it is sparingly covered with a black pubescence ; the trans- 
verse yellow line on the collar sometimes wanting, the tubercles 
entirely black; the anterior femora with a fuscous line above, 
and a yellow one beneath, the intermediate ones with a yellow 
line above, the posterior pair with a yellow spot towards their 
apex above, and the posterior tibize black inside; the four an- 
terior tarsi yellow, with the base of the first joint, and the 
whole of the apical ones, and the entire posterior pair, piceous ; 
the exterior of the basal joint of the intermediate tarsi produced 
in an angle towards its apex, the margin of which is very spi- 
nose; the yellow bands of the abdomen with the second fre- 
quently entire, and the three following generally reduced to an 
