260 Mr. E. Saunders' >Stj)i(>psis of British 



2. unicolor, Latr. Gen. Crust, et Ins. iv. p. 84. 



Fig. Smith Brit. Foss. Hym. pi. iv. fig. 3. 



Usually smaller than hifiuhris, and differing from it 

 in the characters of the wing-cells, as shown in the 

 analytical table above ; it has also the head and thorax 

 largely but less rugosely punctured ; the metathorax 

 with a broad shining, slightly raised, semicircular 

 smooth space below the base, which is well defined on 

 both its edges ; the abdomen also is distinctly punctured 

 in both sexes. 



Length 6—10 mill. 



Hah. — Very common everywhere. 



3. h'thifer, Shuck. Foss. Hym. p. 201. 



Differs from the above, only as far as I can see, by the 

 wider smooth space on the metathorax, which is well 

 defined on its upper margin, but not on its lower ; the 

 smooth space in unicolor rises up distinctly from the 

 smTOunding rugosities, whereas in Icihifer the rugosities 

 seem to diminish as they aj^proach the lower margin of 

 the space till the surface becomes merely punctured. 



Hah. — Equally common as the last ; may be bred 

 freely from bramble stems. 



CEEATOPHORrS, Sluick. (PI. VIII. fig. 28). 



Foss. Hym. p. 195. 



This genus is considered as a section of Pemphredon 

 by Thomson, but it appears to me to be sufiiciently well 

 characterised to maintain ; the clypeus is deeply and 

 squarely notched, and the face between the antennre has 

 a short blunt process like a broken-off spine, its apex 

 slightly emarginate ; the face below the antennse in 

 the S' is not silver}', as in nearly all the genera of this 

 family ; the petiole of the abdomen in both sexes is 

 shorter than in Pemphredon, and the posterior tibiae with- 

 out spines. 



1. morio, V. d. Lind. Nouv. Mem. Acad. Brux. v. p. 84. 

 Var. ^ anthracinus, Sm. 



Entirely black; head rugosely punctured, covered with 

 erect paler hairs ; face, on each side, between the antennae 



