INTRODUCTORY PAPERS ON ICHNEUMONID/E. 279 



** Middle of abdomen red. 

 I Aculeus less than one-half the length of the abdomen. 



22. titillator, 2^ — 5 lines 

 II Aculeus nearly or quite as long as the abdomen. 

 § Nervelet=:= not present. - - - 24. minator, 2^ — 3^ lines. 

 -= [Note.) — The nervelet is a rudimentary nervure that sometimes 

 springs from the nervure between the letters / and q on the right- 

 hand wing of fig. 2 in the plate, given at the commencement of these 

 papers. 

 §§ Nervelet distinct. - - - - 29. Diana, 85 — 5 lines. 



B. Metathoracic spiracles round or nearly so, and small (females). 



a. Aculeus about one-sixth of the abdomen. 87. analis, 21 — 4i lines. 



b. Aculeus about one-third of the abdomen. 35. hostilis, 3 — SJ lines. 



c. Aculeus rather less than the abdomen. 39. alteritator, 2| — 3^ lines. 



C. Metathoracic spiracles elongate and large (males). 



a. Abdomen red, 1st segment more or less black ; hind tarsi white- 



ringed. 

 - Antenna black. .... 31. obsciiriis, 5 — 7^ lines. 

 =;==:= Antennae white-ringed. - - - 28. spinosus, '6^ — 4-|- lines. 



b. Middle of abdomen red ; hind tarsi white-ringed ; antennae black. 

 f Face black and legs also, except the red front tibiae. 



I Transverse anal nervure of hind wing behind the brachial fork.=:= 



22. titillator, 2^ — 5 lines. 

 II Transverse anal nervure almost opposite. 37. analis, 2|- — 4^ lines. 

 ■'' (Note.) — See plate, fig. 2, right hind wing. The terms behind, 

 opposite or in front of the brachial fork alludes to the position of the 

 upper juncture («) of the transverse anal nervure in comparison 

 with the lower (y) : it is said to be in front when a is nearer the 

 thorax than 7, opposite when both are in the same line, and behind 

 when a is further from the thorax than y. 

 it Face white-marked. 

 § Front (and middle) coxae and trochanters white-marked. 



29. Diana, 3|-4| lines. 

 §§ Front coxae and trochanters black. - 24. minator, 3-J- lines. 



D. Metathoracic spiracles round, or nearly so, and small (males). 

 Middle of abdomen, ring of antennae, tibiae and hind tarsi, white. 



39. alternator, 2^ — 3^ lines. 



Section 4. — Scutellum pale ; abdomen red or red and black, apex 



not white. 



A. Metathoracic spiracles elongate and large (females). 

 Abdomen red, petiole more or less black ; antennae white-ringed. 



a. Aculeus one-third the length of the abdomen. 



26. tuberculatus, 4 lines. 



b. Aculeus about as long as tlie abdomen. 



•'.: Hind femora red. . . . . 21. attentorius, 6 lines. 



■>■■'' Hind femora black. - - - 27. apparitorius, 4 — 4^ lines. 



B. Metathoracic spiracles round, or nearly so, and small (females). 

 Abdomen red; femora and tibiae red; antennae white-ringed. 



a. Hind tarsi white-ringed ; aculeus about one-half of abdomen. 



3(3. porrectorius, 2f — 4 lines. 



b. Tarsi not white-ringed ; aculeus almost as long as the abdomen. 



38. rujiventns, 3 lines. 



