British Hymenoptera. 217 



as in that species ; also by the teeth of the scutellum being scarcely 

 observable. Length, 8 — 9 mm. 



Hah. Bare. I have never had the good fortune to 

 capture it myself, hut F. Smith says it is local and para- 

 sitic on Osmia fulviventris, and that it appears in June, 

 and may he taken in July and August. He gives Batter- 

 sea, Hammersmith, and Fulham as ancient localities 

 for it. It has also been taken at Exeter, Norwich, and 

 in Hampshire. 



Unfortunately I have been unable to procure a ^ for 

 dissection. 



3. Stelis octomaculata, Smith. 



Smith, Zool., iii., p. 1155 ; Cat. Brit. Hym., 2nd ed., 

 p. 140. 



Smaller than either of the preceding and less coarsely punc- 

 tured, and at once distinguished by the yellow spots of the abdo- 

 men, of which there are two oval ones on the basal and 2nd seg- 

 ments, an elongate spot on each side of the 3rd and 4tli in the 9 > 

 those of the 4th divided into two spots on each side in the 3' > and 

 there is a spot on the 6th in the latter sex. These spots are doubt- 

 less very variable, as I have a variety of the <? from Holland 

 which has only a round spot on each side of the 2nd and 3rd 

 segments. Length, 6 — 7 mm. 



Hah. Very rare ; parasitic on Osmia leucomelana. 

 Hawley, Hants ; Exeter and Sidmouth, Devon. 



The species is so rare that I can give no dissections of 

 the <y. 



Anthidium, Fabr. 



Fabr., Syst. Piez., p. 364. 



Wings with two submargiual cells ; maxillary palpi 2-jomied ; 

 labial palpi 4-jointed. Abdomen with yellow spots ; $ with the 

 7th dorsal abdominal segment more or less spinose ; six ventral 

 segments exposed ; 7th rounded at the apex, the basal angles very 

 much produced ; 8th produced at the apex into a narrow central 

 process ; genital armature with the stipites short and curved (see 

 PI. X., fig. 3) ; 9 with a ventral pollen-brush composed of simple 

 hairs. 



