206 HYMENOPTERA. 



tennae is minute, and the hind femora are thick, but not ser- 

 rated, and beneath armed with a tooth near the tip. 



The wings are rudimentary so that it does not quit the cell. 

 Newport states that the larva is flat, very hair}', and spins a 

 silken cocoon when about to pupate. It is an " external feed- 

 ing parasite" consuming the pupa as well as the larva of An- 

 thophorabia. The imago appears about the last of June, 

 perforating the cell of the bee. It also lives in the nests of 

 Osmia, Anthophora, and Odynerus. 



The genus AntJiopJiorabia is so-called from being a parasite on 

 Anthophora. The males differ remarkably from the females, 

 especially in having simple instead of compound ej^es, besides 

 the usual three ocelli. A. megacMlis Pack. (Plate 3 ; fig. 7, 

 larva ; 7 a, pupa) is a parasite on a species of JNIegachile. 

 The larva is white, short and thick, cjdindrical, with both 

 extremities much alike ; the segments are slightly convex, and 

 the terminal ring is orbicular and rather large. Length, .04 

 inch, being one-third as broad as long. On opening the cells 

 of Megachile, we found nearly a dozen containing these para- 

 sites, of which 150 larvae Avere counted clustering on the out- 

 side of a dead and dry Megachile larva. In England they 

 occur, according to Newport's observations, in much less num- 

 bers, as he found from thirty to fifty in a cell of Anthophora. 

 A few females hatched out in the middle of October, and there 

 were a few pupos left, but the majority wintered over in the 

 larva state, and a new and larger brood appeared in the spring. 



Perilampus is a beautiful genus, with its shining, metallic 

 tints. The eleven-jointed antennae are short, lying when at 

 rest in a deep frontal furrow. The head is large, while the 

 abdomen is slightl}- pedicelled, being short, contracted, with 

 the OA'ipositor concealed. P. platygaster Sa^' and P. trkmgu- 

 laris Say were described from Indiana. 



The numerous species of Pteromahis often oviposit in the 

 larvae of butterflies. In this genus the antennae are inserted 

 in the middle of the front. The abdomen is nearly sessile, ob- 

 tusely triangular, or acutely ovate in form, with the ovipositor 

 concealed. The femora are slender. There are about three 

 hundred species known to inhabit Europe. Peromcdus va- 

 nessce Harris is a parasite on Vanessa Antiopa. P. disio- 



