74 HYMENOPTERA. 



Var. A. The yellow line at the base of the clypeus 

 obsolete. 



Var. B. The sides of the metathorax ferruginous, and the 

 basal sefjment of the abdomen with only a 

 minute central triangular black spot. 



Mr. Rothney has bred the rare Crabro capitosus from 

 bramble sticks collected at Ipswich ; he has also taken that 

 scarce bee Stelis phcBojitera in the flowers of the mallow at 

 Addiscombe. 



Having had an opportunity of examining the Hymen- 

 optera bred from bramble sticks by Mr. Rothney, I detected 

 among them a new British bee; it is a species of Frosojns 

 most nearly allied to P. diJatata, but is a smaller insect; 

 four specimens were bred, two of each sex. 



Prosopis rubicola. Male. — Length 2^ lines. — Black: 

 the head and thorax closely and evenly punctured, opaque; 

 the metathorax with a triangular space at the base, defined 

 by a sharp ridge, rugose; the head, before the antenna, 

 yellowish-white; the scape of the antennae short, broadly 

 dilated and black, with a minute yellow spot at the apex 

 outside; the flagellum, except the basal joint, fulvous be- 

 neath ; mandibles entirely black. Thorax : a minute yellow 

 spot on the tegulae in front ; the wings hyaline and iri- 

 descent; the anterior tibiae yellow in fi-ont, and the apical 

 joint of the tarsi testaceous ; the extreme base of the inter- 

 mediate tibiae and the basal joint of the tarsi yellow ; one- 

 third of the posterior tibiae at their base and the first joint 

 of the tarsi yellow. Abdomen shining, finely and closely 

 punctured. 



Female. — Closely resembles the male; the head and 

 thorax opaque; the abdomen shining; an impressed line 

 extending from the anterior stemma to the insertion of the 

 antennae, a similar shining impressed line close to the inner 



