192 HYMENOPTEKA. 



it is acutel}' oval, and with five rings in tlie male. Cleptef, 

 semiaurata Latr. is found in Central Europe. We have no na- 

 tive species. In Chryms and the other genera, Stilbnni, Parno- 

 pes, and Iledychruin, the abdomen is hollowed beneath, and 

 the tip is broad and square. Chri/sis hilaris Dahlh. (Fig. 122) 

 is a short, thick, bluish green species, .32 inch in length. It 

 is not uncommon in New England. 



In Jledychrum the maxillary palpi and ligula are rather short, 

 the last cordate ; the mandibles are three- toothed witliin. The 

 abdomen is broad and short, almost spherical, the second seg- 

 ment being the largest. H. dimidiatum Say is found in the 

 Middle States. 



The European StilMim splendidum, Fabr. according to Du- 



fom-, lives in the cells of Pelopajus spirifex. It makes oblong 



' <»>'~X£"-^ ., cocoons of a deep brown, with rounded 



^ ^^f(—^i^' ^ — -. ends ; they are of great tenacity, being 



mixed with a gummy matter. 



Mr. Guenzius states that in Port 

 Natal "a species of StUhiim lnys its 

 eggs on the collected caterpillars stored 

 up by Eumenes tinctor, wliich con- 

 structs a nest of mud and attaches it to reeds, etc., not in a 

 single, but a large mass, in which cells are excavated, similar 

 to the nest of Chalicodoma micraria?* First, it uses its ovi- 

 positor as a gimlet, and when its point has a little penetrated, 

 then as a saw or rasp ; it likewise feels with its ovipositor, and. 

 finding an unfinished or an empty cell it withdraws it immedi- 

 atel}', without laying an egg." 



IcHNEUMOxiD.E Latrcille. The Ichneumon-flies arc readily 

 recognized by the usually long and slender body, the long ex- 

 serted ovipositor, which is often very long, and protected by a 

 sheath formed of four stylets of the same length as the true 

 ovipositor. The head is nonally rather square, with long, 

 slender, many-jointed antenme which are not usually elbowed. 

 The maxillary palpi are five to six-jointed, Avhile the labial 



* A query ( ?) after the name of a species indicates a doubt whether the insect 

 really belongs to that species ; so with a ? after the name of a genus. A ? before 

 both the genua and species expresses a doubt wliether that be the insect :it all. 



