British Hymeno'ptera. 235 



5 and ^ . Like the ^ in colour, and differing only in the 

 ordinary sexual characters ; apex of the abdomen beneath with a 

 long central keel extending to about the half of the segment. 

 Length, 15 — 20 mm. 



Hah. Hampstead, Shirley, Norwood, Norwich, Lowes- 

 toft, Yarmouth, Yorkshire, Scotland ; rare in the South 

 of England. 



6. Bombus Latreillellus, Kirb. (PI. XIL, figs. 12—12 6). 



Kirb., Mon. Ap. Angl., ii., p. 330 ; Smith, Cat. Brit. 

 Hym., 2nd ed., p. 216 =■ subterraneus, Thoms. 



Head clothed with black hairs in both sexes, more or less mixed 

 with yellowish on the face in the ^ ; tongue scarcely reaching 

 beyond the anterior coxae. Thorax clothed with yellowish hairs in 

 the (^ , with a broad black band between the wings ; with black in 

 the ^ and J , with a narrow yellow band in front and a few yellow 

 hairs on the metathorax. Abdomen black at the base ; the 4th 

 and following segments dirty white or yellowish ; the apical mar- 

 gins of the basal segments fringed with the same colour. 



(^ . Differs from the preceding, besides in the colour characters 

 given above, in having the 2nd and 4th joints of the flagellum sub- 

 equal, the 8th ventral segment of the abdomen emarginate at the 

 apex, and the genital armature with the inferior process of the 

 sagittsB sharply pointed above in front (see PL XII., figs. 12 — 12 6). 



5 and 5 . Differ from distinguendus, so far as I have been able 

 to make out, only in colour. Length, 16 — 20 mm. 



Hah. Generally distributed in the South of England, 

 and abundant in some localities. 



I have little doubt that Morawitz is right in consider- 

 ing this as a variety of the preceding; the structural 

 characters are so slight as to be scarcely worth con- 

 sidering apart from the colour ; and in the ^ we find 

 varieties which run almost as pale as the typical dis- 

 tinguendus. Subterraneus, hortorum, and ligusticus are 

 now considered as forms of one species, the ? of each 

 being distinguishable in colour, but the <? identical ; and 

 I think this species and the last should be united on the 

 same principle. 



The ? and ^ resemble hortorum and subterraneus in 

 colour, but the shorter face and the short tongue will 

 separate them at once from that species. 



