( vii ) 



less brightly leneous, and altogether darker-looking above 

 than the c?. There are also of course the regular sexual 

 differences between them, which occur in all Anthophila, 

 as to antennte, number of abdominal segments, possession 

 of a scopa, genital armature, etc. The clypeus and mandibles 

 dili'er also in shape, though not in colour ; the last or sixth 

 dorsal segment is simple (apically incised, as is the seventh 

 also, in the male) ; and the hind metatarsi are without a little 

 tooth, which in the c? is always present, though generally 

 quite concealed by longer and very dense hairs. In the 

 specimen exhibited, the general appearance above was (be- 

 fore dissection) completely ? ; as were also (I believe) both 

 antennje, though unluckily one has been broken off and lost. 

 That remaining is obviously ? . The genital armature seems 

 to be entirely $ also, though not quite in a normal state, 

 as though somewhat shrivelled and distorted. But the 

 following parts are certainly ^ : the right mandible ; the 

 I'ight posterior metatarsus ; the two last apical (sixth and 

 seventh) visible dorsal plates of the abdomen ; tlie right side 

 only of the third, fourth, and fifth ventral plates of the 

 abdomen. I think that the first and second ventral plates are 

 also 5 throughout. The last or sixth ventral plate is rather 

 puzzling. It shows, on the right side only, what looks like 

 part of the 5 scopa ; whereas, in the preceding segments, 

 the scopa-bearing $ side is, as has been said, the left. Thus, 

 on the ventral side of the abdomen S chai'acters largely 

 predominate (the ? with one doubtful exception occurriug 

 only on three segments, and only on the left side of each of 

 these). The dorsal apex is also 3 entirely. Yet the genital 

 armature seems to be completely $ , and I can find no trace 

 of the concealed imperfectly chitinized segments which in 

 all Hymenoptera ensheath the armature oi a. S • In the 

 head the general appearance, the clypeus, one antenna at 

 least (? both), and the left mandible certainly suggest a 

 5 : — perhaps too the thorax does so, but one ought to have 

 studied its sexual modifications more thoroughly than I have 

 done, to be certain as to this. The insect was kindly sent to 

 me (with the gynandi'omorphous Eucera which I exhibited last 

 jBonth, and sevei'al other similar monstrosities) by INI. Jean 



