Acrotomus | BRITISH ‘IGHNEUMONS. 199 

7. mesoleptoides, Steph. 
Tryphon mesoleptoides, Ste. Ill. M. vii. 245, ?. Acrotomus coarctatus, 
Holmgr. Sv. Ak. Handl. 1855, p. 224, ?. Delotomus coarctatus, Thoms. O. E, 
ix. 885, 2. 
A black species with face partly flavous and abdomen centrally red. 
Head buccate and not posteriorly constricted; mouth and face flavous, 
the latter triangularly black centrally; clypeus apically subtruncate and 
frons coarsely punctate. Antennae red, with only the scape and _ basal 
flagellar joint discally black. Thorax punctate, hardly narrower than head 
and black, with a circular testacous callosity before radices; areola and 
costulae traceable though weak. Scutellum and usually postscutellum 
flavous. Abdomen black with the very convex second and third segments, 
and often the fourth, red; remainder nigrescent and the apical four obso- 
letely white-margined ; basal segment half as long again as apically broad, 

hardly explanate apically, with apical angles red and petiole somewhat 
slender, laterally margined and discally bicarinate to near its apex ; 
valvulae large and exserted. Legs normal and fulvescent; anterior coxae 
and trochanters infuscate; hind legs red with coxae and trochanters, 
except apices of the latter, and sometimes their femora black. Wings 
slightly clouded, stigma conspicuous and piceous with a white basal dot, 
areolet petiolate and triangular; nervellus subopposite and intercepted 
slightly below its centre. Length, 8—1o mm. 
The above structural details are drawn from the type in the National 
Collection, where are also ten other females from Desvignes’. It was 
found by Stephens near Hertford in June; and is recorded from Essex in 
the Vict. Hist. A. coarc/afus has not hitherto been recorded from Britain 
nor synonymised with Stephens’ species; but it is not rare here, and I 
possess it in Piffard’s collection from Felden in Herts, Beaumont’s col- 
lection from Chobham in Surrey, taken at the end of May, 1896, and 
there is another in the Edinburgh Museum. 
