266 Mr. E. Saunders' further notes on the 



a few apical hairs. In Habropoda ezonata the apex of 

 the 7th has a distinct thickened transverse ridge, heyond 

 which is a thinner, somewhat quadrate, appendage 

 fringed with hairs ; in H. zonatula, beyond the middle 

 of the 7th, are two strong lateral spines, and the apex 

 beyond is attenuated and finely truncate ; armature in 

 all three genera stout and squarish in form ; stipites 

 with very variable lacinige ; sagittae thick, widely sepa- 

 rated in the middle and converging at the apex, often 

 dentate on their inner margins (see PI X., figs. 7, 8 ; 

 PI. XL, figs. 1—3). 



Xylocopa. — 7th ventral segment a simple narrow band ; 

 8th of a somewhat quadrate form ; armature in X violacea 

 nearly square ; the stipites without distinct lacinise, 

 curved inwards at the apex ; sagittae subparallel, their 

 apices dilated and flattened, bent downwards, and con- 

 vergent. 



Ceratina. — I have had great difficulty in finding the 

 7th and 8th segments in this genus, but I have a speci- 

 men of chalcites which shows a distinct submembranous 

 band, uniting the two sides of the 7th dorsal, and cross- 

 ing the armature beneath, which I take to be the 7th ; 

 the 8th is a very fine thin membranous plate, lying 

 beneath the armature, and emarginate at the apex ; the 

 armature is short and stout ; the stipites "with somewhat 

 narrow laciniae, pilose at the sides and apex ; sagittfe 

 widely separated at the base, and converging to the apex 

 (see PI. XL, fig. 5). 



Psithyrus and Bomhus. — There is very little difference 

 between these two genera in their armature, &c. ; the 

 7th ventral segment is corneous and bears a few hairs 

 at the apex ; the 8th similar in texture to the 7th, but 

 narrower and somewhat pointed ; armature with dis- 

 tinct and very variously-formed lacinise to the stipites, 

 which are stout ; the sagittae are elongate and vary much 

 in form, so that the armature affords excellent specific 

 characters in both genera (see PL XL and XII.). 



Apis.— Quite unlike any other genus in the armature, 

 which has the stipites wide and triangular (see PI. XII., 

 fig. 15), and the sagittae hidden and separated from them, 

 only to be discovered by dissection (see PL XII., figs. 

 15 a, 15 h) ; and the whole armature is of much the same 

 consistency as the other segments of the body, instead 

 of being hard and shining as in the allied genera. 



