1918.] flf: 



Synopsis of males. 



1. Aedeagua with two small but distinct angulations on its lower edge when 



projected (on the upper ^yllen it is reflexed in repose) . .2. 

 Aedeagus without these angles 7. 



2. Fourth joint of the antennae generally about twice the length of the fifth 



and always more than one and a half times this length . .3. 

 . Fourth joint not one and a half times the length of the fifth. .6. 



3. Fourth joint not shorter than the fifth and sixth together. 4. 

 Fourth j oint rather shorter than the fifth and sixth together . 5. 



4. Apex of the third joint only reaching a little beyond the tip of the 



fifth melittae Kirby . 



Apex of third joint reaching as far as the middle of the sixth 



joint thwaitesi 



(P thwaitei S. Saunders). 

 6. A species apparently distinct from either of the- preceding, the host 

 supposed to be A. wilkella ; the cephalothorax of the $ found in this 

 bee is very similar to, if indeed distinguishable from that which is 

 found in A. afzeliella, but the male parasite appears to have a distinctly 

 shorter and broader fourth antennal joint wilkellae, sp. n. 



6. Fifth and sixth joints of the antennae together much longer than the 



fourth. A smaller species with distinctly shorter wings than the 

 preceding kammeUa, sp. n. 



7. Thiid joint of the antennae extending back to the tip of the sixth or almost 



thus far, so that (at least with slight flexure) the fourth, fifth, and sixth 



joints rest in the concavity of the third nevinsoni, sp. n. 



Sixth joint of the antennae extending far beyond the tip of the 

 third 8. 



8. Sixth joint considerably longer than the fifth and only a little shorter than 



the fourth bimaculatae, sp. n. 



Sixth joint not much longer than the fifth, and less nearly equal to 



the fourth 9. 



P. The largest species, length of wing from base to tip exceeding 3*75 mm. 



spencii Pickering. 

 Smaller, length of wing not exceeding 3 76 mm aterrinia Newport. 



1. — Stylops melittae Kirby. 



Through the kindness of Mr. A. H. Hamm I have been able to 

 examine half a dozen comparatively recently-caught or bred examples of 

 the 6 of this species. In past years I have frequently bred it myself 

 from Andrena nigroaenea. In F. Smith's collection of bees are two 

 6 Stylops labelled as bred from A. trimmer ana, but one of these is 

 in my opinion >S'. melittae, though it is distinctly larger than any of 

 Hamm's specimens. I suspect that Smith applied the wrong name 

 to the hosts of his example, because in other cases I know that he 

 identified S atriceps stylopized as irimmerana, and he also confused 

 nigroaenea and atriceps, both stylopized and healthy. In some examples 



