Dec. 1896 ] Packard: Transformations of Hvmenoptera. 161 



to fourth joint from end of antenna. Labial palpi 3-jointed, reaching 

 to fourth joint of maxillary palpi. Legs long and slender, especially 

 the tarsi. Wings long, partially overlapping the middle tibiae. The 

 hind tarsi reach to beyond the middle of the abdomen. Thorax and 

 abdomen much as in the adult. Ovipositor not retracted. Hind 

 femora and tibiae folded in the pedicel, between the thorax and ab- 

 domen. Length .25 inch. 



Passalaecus mandibularis Cresson. 



Pupa. — 9. The head is much as in Cemoniis, but the eyes are 

 much narrower. The mandibles are greatly elongated, projecting far 

 beyond the head, the tips meeting but not crossing, as they do in the 

 imago. The antennae are folded at right angles over the base of the 

 jaws, reaching back to the base of the mesosternum. The maxillae are 

 very short, merely enclosing the labium whose base is wedged in be- 

 tween them. Both pairs of palpi are shorter and thicker than in Ce- 

 tnonus. The labium is distinctly triangular, with the front edge square ; 

 the palpi are 4-jointed, the basal joint minute, third longer than the 

 second ; fourth nearly twice as long as the third, reaching just beyond 

 the base of the maxillary palpi, the latter reaching to the last joint but 

 two of the antennae. Wings as in Cemoniis, though a little shorter. 

 The limbs are arranged much as in Cemoniis: the forelegs reach to the 

 trochanters of the 2d pair, and the hind tarsi to the middle of the 4th 

 abdominal segment. The abdomen is sessile, regularly ovate, the basal 

 segment being -3 as long as broad, as in Cemoniis, the tip ending in a 

 long slender needle like raucronate spine; the ovipositor is long and 

 slender, exserted, the inner pair of rhabdites chitinous, the middle pair 

 very small, slender and filiform, the 3d and outer pair somewhat in- 

 curved, much shorter than those in Cemoniis, which are long and 

 straight, while in Cemoniis the mesial pair are not chitinous in the 

 specimens before me, which, however, is apparently of the same age as 

 those of Passaheciis ; thus showing excellent generic characters. 



In the specimen examined, which is a pupa to all intents and pur- 

 poses, the body is surrounded with a subimago pellicle. It is easily 

 recognized by its long-curved projecting jaws, the long slender body. 

 It was found in small galleries in the stem of syringa the last of May, 

 in company with Cemanus. 



Rhopalum pedicellatum Pack. 



Larva. — Body short and thick, tapering rapidly towards the head 

 and tip of abdomen, flattened beneath a little, very convex above; seg- 



