2. PP.OSOIUS. " 



Female. Length 2|-3 lines. — Black; head orbiculate, the clypeus 

 truncate anteriorly, a yellow or sometimes a fulvous macula below 

 the insertion of the antennae, not touching the eyes ; the apex of 

 the flagelluni fulvous beneath ; the collar has an interrupted line, 

 the tubercles, and a spot on the tegulse in front yellow ; all the 

 tibia3 yellow at the base ; the wings hyaline, beautifully iridescent, 

 their nervures fuscous ; the abdomen very smooth and shining, 

 the margins of the segments sometimes narrowly rufo-piceous. 



B.M. 



Male. Length 3 lines.— Black ; the face below the insertion of the 

 antennae and the scape in front cream-coloured ; the mandibles are 

 of the same colour in the middle, having their base black and their 

 apex ferruginous ; the scape of the antenna; broadly expanded, sub- 

 quadrate, concave beneath ; the flagellum, except the basal joint, 

 fulvous beneath; the collar with an interrupted line and the 

 tubercles and tegulae in front white ; the latter are ferruginous 

 behind, as well as the extreme base of the wings and their nervures ; 

 the wings pale rufo-hyaline; the tibiae, tarsi, and knees pale yel- 

 lowish white ; the anterior and intermediate tibiae have a black stain 

 behind, and the apical half of the posterior pair black; the apical 

 joints of the tarsi pale ferruginous, The abdomen oblong-ovate, 

 covered with a short pile, particularly on the apical margins of the 

 segments. B.M. 



I captured both sexes of this rare species near Lowestoft, at Pake- 

 field, in August 1359, on flowers of the bramble. I also observed it 

 entering its burrows, which were excavated in stems of the common 

 dock. The following summer I reared both sexes from these nests. 

 I have a suspicion that the bee usually burrows in dead stems of the 

 bramble, and that my finding them in the situation mentioned was a 

 deviation from the usual habit of the species. I have also taken it at 

 Blackwater, Hants, and at Kingsdown, near Deal. It has also been 

 taken at Bournemouth, and at Arundel, Sussex. I have received 

 from Paris specimens supposed to be this insect, but they were black 

 varieties of P. variegata. The true species has been sent from Ger- 

 many by Prof. Miiller. 



3. Prosopis cornuta. 

 P. atra, fronte maculata, tibiis flavo maculatis, clypeo cornuto. 



Prosopis cornuta, Smith, Bees Great Brit. 10, pi. 1. fig. 1 $, la, 



lb rf. 

 llvheus cornutus, Smith, Trans. Ent. Soc. Land. iv. 32, tab. 3. fig. 4$; 



*Zool. vi. 2204. 

 Ilylfeus plantaris. Smith, Tram. Ent. Soc. Loud. iv. 32, tab. 3. fig. 2tf; 



Zool. 2205. 



Female. Length 3] lines. — Black ; head rotundate, a stout angular 

 tooth on each side of the clypeus, which has its base raised, forming 

 an elevation which passes backwards between the antenna? : the 



