196 BRITISH ICHNEUMONS. [Acrotomus 

3. lucidulus, Grav. 
Trvphon lucidulus, Gr. 1. E. ii. 162, excl. var. 1; Ste. Ill. M. vii. 238; cf. Hal. 
Ann. Nat. Hist. 1839, p.113, 2. Exenterus lucidulus, Schidd. Mag. Zool. 1839, 
p.12; Ratz. Ichn. d. Forst. i. 108; ii. 112; iii. 107 et 121, ¢. Acrotomus lucidu- 
lus, Holmer. Sv. Ak. Handl, 1855, p. 222; Voll. Pinac. pl. xlii, fig1, ¢ ?. Delo- 
tomus lucidulus, Thoms. O. E. ix. 884, ?. 
A slender, nitidulous, punctulate and pubescent black species. Head 
buccate with the mouth, face and the apically somewhat narrowed and 
truncate clypeus, flavous. Antennae rufescent beneath. Thorax narrower 
than head and immaculate with scutellum scarcely convex and apically, 
like a postscutellar transverse line, flavous. Abdomen black or badious, 
with most of the segments indistinctly flavous apically ; second segment 
punctulate, with a short and oblique impressed line on either side of base ; 
the following nitidulous and subglabrous. Legs rufescent, with the hind 
tibiae and tarsi sometimes more or less infuscate; anterior coxae and 
trochanters flavous. Tegulae flavous; radial nervure apically slightly 
curved ; nervellus intercepted below its centre. Length, 5—6 mm. 
The colouration of this species is very variable; the face and clypeus 
are sometimes black with flavous markings, and the segments, excepting 
the first, more or less rufescent or entirely red. Pfankuch says the types 
differ from A. sexczncfus and A. succincfus in little but colouration, and the 
latter's shorter terebra ; inv specimen 1s much smoother. 
This is a somewhat common species both here and abroad; Graven- 
horst found it on umbelliferous flowers from June to September. On the 
Continent it has been bred by Hartig from Cladius albipes and by Graft 
from Lophyrus pint (Ratzeburg) ; from larvae of Cladius difformis and C. 
albipes (Brischke); and from Priophorus padi (Cameron) and Trichio- 
campus rufipes (Gaulle). Several specimens near London in August 
(Stephens) ; taken at Lynn in Norfolk by Atmore (Bridgman); Botus- 
fleming, Cornworthy, Bishops Teignton and Grovely Wood, near Salisbury 
(Marshall's coll.) ; Bolt Head, Devon, at end of June (Bignell); Guest- 
ling in Sussex (Bloomfieid) ; Essex (Vict. Hist.) ; and one male given me 
by Garde, from Lydford in October, 1895. Stenton took a female in his 
garden at Herne Hill in the middle of June, 1910. 
4. laticeps, Grav. 
Tryphon laticeps, Gr. I. E. i1. 214, ¢. Delotomus laticeps, Thoms. O. E. ix. 
884. Acrotomus laticeps, Pfank. Zeits. Hym. Dip. 1906, p. 289, ¢. 
A black species with the whole face, the cheeks broadly, the antennae 
beneath, scutellum apically and postscutellum, flavous; the abdomen 
centrally, with tibiae and anterior femora, rufescent; areolet irregularly 
triangular and subpetiolate. Length, 6—7 mm. 
This female differs from the remainder of the genus in having the 
cheeks buccate and not dentately produced below the mandibles; from 
A. lucidulus in its subtransverse and apically a little rounded clypeus; it 
is similar in its abdominal and clypeal conformation to A. mesolepiordes, but 
the cheeks are simple and buccate, their flavescence extends beyond the 
centre of the eyes, the temples are dilated, the metathoracic areola is 
shorter and the stout terebra also shorter, 
