354 Mr. Bridgman's additions to T. A. MarshaWs 



Mesochorus granigcr, Thorns. 



This species I considered M.festirus, Holm.; it was 

 bred by Mr. Bignell from Abraxas grossidariata, hyper- 

 parasitic on Exorista vulgaris, F. 



Mesochorus tcnuicornis, Thoms. 

 Taken in the neighbourhood of Norwich. 



Mesochorus temporcdis, Thoms. 

 Bred from Z . filipcndidce by Mr. Bignell in 1878. 



Mesochorus convexicollis, Thoms. 



I had considered this species M. comjjlanatus, Hal. : 

 it seemed to me to agree exactly with Holmgren's de- 

 scription of that species, and from Thomson's description 

 I fail to see the difference ; he gives the length of his 

 species as 4 mm. The two females I have taken are 

 3 mm. long. 



Mesochorus fuscicornis, Brischke. 



Trans. Ent. Soc. Lond., 1882, 154. 



This Thomson considers to be M. pectoralis, H. ; but 

 in my bred specimens the hind coxse are generally more 

 or less piceous, a point not mentioned by Holmgren, 

 Thomson gives the length as 5 to 6 mm. ; mine do not 

 exceed 4 mm. 



I sent all my specimens of Mesochorus to Professor 

 Thomson, at his request, and these new species were 

 named by him. He lias written a monograph of the 

 genus, which has just appeared in the ' Annales de la 

 Societe Eutomologique de France,' 1886, 327. 



Thersilochus margiuatus, n. s. 

 Niger, segmeuto secundo rufo marginato, aculeo segmento primo 

 breviore. 



Head bcliind the eyes slanting backwards at the sides ; head and 

 thorax subopaque, finely punctate ; clypeus distinctly separated 

 from the face; apex widel}' rotundate. Autonna3 rather long; 

 iiagellum 26 joints, 1st joint rather more than twice as long as 



