1918.] 125 



spring brood) in numbers at Oxford in a stylopized condition, but all 

 the Devonshire examples that I have seen belong to the summer broocl. 



7. A. (jravidu Xyl. {fascia (a Inih.). — The really remarkable 

 specimen, which stood in F. Smith's collection as the sole exponent 

 of Kirby's mouffefeUa, must, although captured in Julv, be referred 

 to gravida, even though that species does not normally have a summer 

 generation. It bears only a single $ Stylops^ yet the changes produced 

 by this are very great. The apical pubescent bands on the abdominal 

 segments are dense, but not pure white as in normal females, and are 

 formed of more erect hairs, having a tendenc}' to curve ; the surface of 

 the 2nd segment has a very short pale pubescence (not l)earing long 

 hairs as in the $ , nor being nude as in the normal $ ), while the next 

 two are very densely clothed all over with short pale hairs, so that the 

 apical fasciae do not stand out conspicuously, as in fasciata and 

 fulvicrus. 



The puncturation is not much changed from the normal. The 

 clothing of the thorax above, the white hairs of the face and underparts 

 make it necessary to refer this bee to gravida rather ^hsm fulvicrus. 



8. A. hucephala Sm. — I have only seen one small stylopized male 

 bee and one female of this species, and neither were greatly changed by 

 the parasites, which were females. The male had the head and mandibles 

 quite similar to a healthy example of its own size. 



9. A. spinigera K. — Three stylopized males of this species show no 

 special effect from the parasite. The mandibles, and the spines on the 

 cheeks — striking secondar}- sexual characters of this species — are quite 

 normal. 



10. A.fulva Schr. — The effect of the stylopization on the male of 

 this species is of a most interesting chamcter. The few stylopized 

 examples that I have examined are none of large size, but the falcate 

 mandibles and the basal mandibular teeth remain normal for small 

 specimens. The head is considerably decreased in size in some cases, 

 without effacing the secondary sexual characters just referred to. 

 Normal male fulva has the first and middle of the second abdominal 

 segment clothed with very long fulvous hairs ; in stylopized examples 

 the whole abdomen is clothed with equally long hairs, so that the con- 

 dition approximates to that of the female. The colour of the clothing, 

 however, remains much like that of healthy males and does not assume 

 either on abdomen or thorax the deeper shade so characteristic of the 



