244 Mr. E. Saunders' Sijuopsis of 



posterior margin of the metatliorax, yellow ; the posterior tibiae m 

 this sex with red hairs, iu the 2 and ^ with black ; the 5 and ? 

 have rarely a pale anterior band on the thorax. 



3". Head clothed on the vertex with black hairs, and with 

 yellow on the face ; cheeks about as long as their apical width. 

 Antennae with the 2nd joint of the flagellnm slightly longer than 

 the 4th ; the 3rd aboiit two-thirds as long as the 2nd. Thorax 

 clothed with black hairs, with a wide band of yellow hairs in front, 

 which is continued under the wings and covers nearly the whole of 

 the under side ; there are also a few pale hairs generally on the 

 metatliorax. Abdomen clothed with black hairs ; the sides of the 

 segments sometimes more or less greyish ; 4th and following seg- 

 ments clothed with bright red hairs ; beneath coloured as above ; 

 genital armature with the sagittse simple beneath, their apices each 

 with a sharp hama on the inner side ; squama rounded in front, 

 projecting slightly on its inner margin at the base ; lacinia flat, 

 sinuate at the apex (see PL XII., fig. 8) ; posterior tibiae clothed 

 with red hairs. 



5 and 5 . Entirely clothed with deep black hairs, with the 

 exception of the three bright red segments at the apex of the 

 abdomen, and in some varieties of a pale anterior thoracic band. 

 Length, ^ and j 14 — 20mm., ^ 12 — 16mm. 



Hah. Very common and widely distributed. 



The only British species with which this can be con- 

 founded is DerJiamellus, but the ? and ^ of that species 

 have the hairs of the posterior tibiae red, and the abdo- 

 men shorter and more globose. 



16. Bomhus teirestris, Linn. (PI. XII., fig. 13). 



Linn., Syst. Nat., ed. x., p. 578 = Incoriim, Smith, 

 Cat. Brit. Hym., pt. i., p. 225 = virginalis, Kirby, 

 Smith, &c. 



Head clothed with black hairs, or with the face yellow in var. 

 lucorum of the ^ ; thorax with black haii'S, a band in front yellow, 

 and often in the ^ also with a band behind ; in some extreme vars. 

 of the 3 the yellow is so extended as to leave only a narrow black 

 band between the wings ; abdomen with the basal segment black, 

 2nd yellow, 3rd and 4th black, the latter at the apex and the two 

 apical segments white or tawny. In the ^ the yeUow hairs often 

 cover the 1st and 2nd segments in var. lucorum, and there is 

 sometimes a line of yellow hairs dividing the central black belt of 

 the abdomen into two. 



3 . Face short, the cheeks shorter than their apical width. 

 Antennie shorter than in most of the species, scarcely reaching 



