INTRODUCTORY PAPERS ON ICHNEUMONID^. 59 



ft Scutellum almost pyramidal. 

 Apical margin of the cljpeus obtusely subangulated in the middle. 



Gen. 5. Trogas, Paiiz. 

 GO Apical margin of clypeus straight. - Gen. 6. Automalus, Wesra. 

 =-■:= Anterior legs, in proportion to the hinder, rather short, hinder ratlier 



stout ; tibiae sometimes subarcuated. 

 X Above the collar two deep pits, these separated by a little keel or 

 tubercle. Tarsi in both sexes simple. Gen. 7. Anisohas, Wesra. 

 X X Impression of the collar simple. Claws of tarsi in the female 

 pectinated or serrated ; male simple. Gen. 8. Listrodromus, Wesm. 

 b. Abdomen of female has the 8th segment shortly exserted ; antennae of 

 male has the 10th to 14th joints of the flagellum subdilated. 

 Tibife slender, hinder somewhat bow-shaped. 



Gen. 9. Hypomecus, Wesm. 

 B. Abdomen of the female compressed; apex subtruncated. 



Gen. 1. Limerodes, Wesm. 



The females of this subfamily are easily distinguished by the 

 last ventral segment reaching nearly or quite to the apex of the 

 abdomen, and completely covering the base of the aculeus. The 

 males are not so easily distinguished ; the 4th ventral segment, 

 sometimes also the 3rd, or more rarely all the segments, are 

 destitute of the elevated fold ; but some have the fold on the 2nd 

 to 4th segments, as Amhl. fasciatorius, A. notatorius, A. oratorius, 

 A.palliatorius, A. spoliator, and A. litigiosus. Some of the males, 

 Avihl. pallidicornis, A. vadatorius, A.glaucatorius, A. Gravenhorstii, 

 A, amatorius, have the last ventral segment at the apex acumi- 

 nated. A few have the antennae slightly thickened and sub- 

 serrated, Ambl. divisoi'ius, A. fossorius, and especially A.Jlavo- 

 cinctus ; or incrassated in the middle, Hyp. albitarsis. 



In the following table some of the distinctions are taken from 

 the size of the gastrocseli, or those pits at the base of the 2nd 

 segment of the abdomen. To save much repetition, by gastrocseli 

 small is meant that the space between is generally wider than the 

 middle area of the post-petiole ; the post-petiole is generally 

 divided into three parts, two lateral and a middle area. Gastrocseli 

 large means that the space between them is less than, or about 

 equal to, the width of the middle area of the post-petiole. The 

 arese of metathorax, either three or five, alludes to the upper 

 surface between the scutellum and the slanting part of the meta- 

 thorax. On reference to fig. 2 of the plate, the supero-medial 

 area is denoted by fig. 1, and there are two lateral arese on each 

 side, forming five arese (see also fig. S''); when the cross line 

 dividing each lateral area is absent, then there are but three areae 



