224 BRITISH ICHNEUMONS. 



differs from P. opaciilus. Thorns., in its smaller size, finely punctate frons, 

 basally red tibiae and shining mesonotum, shorter spiracles and more 

 slender legs ; from P. piani/io, Holmgr., in its larger size, the linear an- 

 tennae of the ? , which are longer and have the twelfth joint elongate, 

 as well as in its larger thyridii, the space between which is rugose ; from 

 P. pinutifrons, Thorns., in its finely and closely punctate frons, somewhat 

 longer petiole and sub-rugose, not alutaceous, post-petiole ; from P. s/eriio- 

 leuciis, Wesm., in its distinct gastrocaeli, which in the latter are sub-obsolete 

 with the white markings more profuse ; P. pullus, Wesm., is another allied 

 species, but may at once be known by its smaller size, broad and sub- 

 buccate head, centrally incrassate antennae, more slender petiole and 

 finely, closely punctate post-petiole, which is a little broader and shorter 

 than in P. pedatorius. Several others of the group have been described, 

 but the foregoing are those most likely to be found in Britain. 



This species is common everywhere, on oaks and umbeUiferous flowers, 

 from June to September. It has been bred from Pehirgia comitafa early 

 in March, Hibemia defoliaria, Eupithecia sobrinata, E. tntwtata, E. scopa- 

 ?-iafa, E. tia/iata, E. exiguata, E. p'nnpinellata ; and in Britain from E. 

 subiiotafa, Tliera firmata, Limacodes testiido and Hypofiomeuta egregielln. 

 It has been recorded from Bickleigh and Hartley, in Devon, where it 

 was bred towards the end of .September, from Lobophora lobulata ; from 

 Land's End ; about London ; Essex ; Hertford ; York ; Goole ; and com- 

 monly from Norfolk. The type form would appear to be of much less 

 frequent occurrence than the variety ; indeed, besides those mentioned 

 without locality, in Ent. Rec. 1899, p. 332, I have only seen one example, 

 which was from Mr. Piffard's collection, taken at Felden, in Herts., and 

 one at Ripley, early in June, by Mr. Morice. The var. iridipentiis I 

 possess, from London, in July (W. Saunders) ; New Forest (Miss Chawner) ; 

 Whitby, in August, and bred at York, from Eupithecia albipunctata, in 

 April (Beaumont) ; Chippenham Fen, in Cambs., in July (Tuck) ; Bram- 

 ford Marshes, near Ipswich, flying about oak leaves, in the middle of July, 

 and Tuddenham Fen, in Suffolk, late in August, by myself Dr. Cassal 

 has given me a male, bred from the pupa of Penthina dimidiana, on 

 Myrica gale, together with the chrysalis, which it had evacuated through a 

 sub-circular hole in the ventral surface of the thorax, having composed no 

 cocoon and spun no silken threads therein. It is common throughout 

 Europe. 



4. pumilio, Holmgr. 



Platylahus pniiiilio, Holmgr. Ichn. Suec. ii. 422, ? ; Thorns. Ann. See. Fr. 1888, 

 p. 124; Berth. Hh. cii. 1896, p. 322; Thorns. O. E. xix. 2108, (J ? . P. Iransvcrsiis, 

 Bridg. Trans. Ent. Soc. 1889, p. 412 ; Berth. Ann. Soc. Fr. 1896, p. 323, i ; cf. Mori. 

 Ent. Rec. 1899, p. 332, add. note. 



This species very closely resembles the last-described in size and struc- 

 ture, but the clypeus is apically glabrous ; the genal costa anteriorly sub- 

 sinuate and the oral hardly elevated ; the antennae of the ? are shorter, 

 with the twelfth flagellar joint quadrate, the following ones being thicker, 

 sub-dilated, and the pale band is narrower ; the scutellum always has an 

 apical white dot and the post-scutellum is also sometimes pale in the c^ ; 

 the second segment is sub-glabrous and never rugose at its base, with the 

 thyridii smaller and the gastrocaeli broader. The $ sometimes has the 

 anterior coxae basally, and the face entirely, white. Length, 7-8 mm. 



