Dec. 1896.] Packard : Transformations of Hymenoptera. 
16 L 
to fourth joint from end of antennae. 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 Cemonus , 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¬ 
monus. 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 Cemonus , though a little shorter. 
The limbs are arranged much as in Cemonus; 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 2/3 as long as broad, as in Cemonus , the tip ending in a 
long slender needle-like mucronate 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 Cemonus , which are long and 
straight, while in Cemonus the mesial pair are not chitinous in the 
specimens before me, which, however, is apparently of the same age as 
those of Passalcecus ; 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 Cemonus. 
Rhopalum pedicel latum Pack . 
Larva. —Body short and thick, tapering rapidly towards the head 
and tip of abdomen, flattened beneath a little, very convex above; seg- 
