80, THE ENTOMOLOGIST. 



II 4th or 5th to 7th segments with the apical margins yellowish. 



20. occisorlus, 5^ — 8 lines (/t, s, a). 

 b. Metathoracic areae, five. 



§ Head behind the eyes not narrowed. 22. necfatorius, (3 — 8^ lines (a). 

 §§ Head behind the eyes obliquely uarrowed. 



23. uniguttatus, — 7 lines {I, a). 

 B. 1st to 3rd segments red, and sometimes 4th more or less ; petiole 

 more or less black (males). 

 Tibiae red, apex of hind one black. - 38. strigatorius, 5 — 6 lines. 



Section 7. — Scutellum pale; abdomen red, or red and black. 



A. Gastrocseli small (females). 



a. Areae of metathorax, five. 



* Abdomen red ; middle segments blackish at the base ; hind femora 



red. - - - - 15. equitatorius, 5 — (3|- lines (h, a), 



■r-'.- 2nd and 3rd, and sometimes partly the 4th, segments red ; incision 

 of 2nd fuscous black ; hind femora black. 



16. litigiosus, 5i — 7 lines [t, a). 



b. Areae of metathorax, three. 



2nd and 3rd segments red ; front legs partly red. 



39. aUicola, Gi — 1^ lines. 



B. Gastrocaeli moderate, or rather large (females). 



a. Segments 2nd to 7th, tibiae and tarsi, red. 37. fusorlus, 8 — 10 lines. 



b. Abdomen chestnut, base black. 



* Hind tibiae red ; apex and extreme base black. 



33. repentinus, b\ — 7 lines. 

 Note. — Gravenhorst described J. melanocastanns and I. repentinus 

 as distinct species. Wesraael, in 'Tentamen,' united them, placing 

 the latter as a vnr. of the former, but separated them in Bui. Ac. 

 Brux., 1857, as Mr. Marshall has done in his list; but Holmgren 

 has united them thus : — 



Var. 1, male and female. Scutello nigro. 



IcJmeuvion melanocastanus, Grav., I. E., i., 553. 

 Ambhjteles indanocastanus, Wesm. Tent., 135. 

 Var. 2, male and female. Scutello toto vel apice albo. 

 Ichneumon repentinus, Grav., I. E., i., 467. 

 These two varieties are quoted by Wesmael in ' Tentamen,' with the 

 same distinctive marks. From this it would appear one has a pale 

 scutellum, the other has not. 

 ** Hind tibiae almost entirely black. 



Metathoracic areae subquinque. - 31. viesocastanus, 5 — 7 lines {a). 



c. 2nd and 3rd segments red ; the 4th sometimes marked with red ; 



margins of red segments genei'ally obscure. 

 f 2nd and 3rd segments entirely red. 



+ Areae of metathorax, three ; hind tibite reddish or brown ; apex black. 



30. rnessoriiis, 6 — 7 lines {I, a). 



II Areae of metathorax, indistinctly five ; hind tibiae not reddish at the 



base. - - - 31. mesocastanus, 5 — 7 lines (a). 



\\ Apical margins of 2nd and 3rd generally black (§), or segments more 



or less black, entirely so, or quite red (§§). 



