234 ENTOMOLOGICAL SOCIETY 



not in motion, yet they adhered by the feet more firmly to the 

 leaf than in the healthy condition. On each larva were two eggs 

 of a parasite, rather large, elliptical, pale orange eggs, placed 

 transversely on the venter. Several larvae were placed in a vial 

 June 8th. The eggs soon hatched. June nth there were two 

 elliptical smooth green maggots, motionless, the head applied to 

 the saw-fly and sucking its blood. Slightly corrugated by the 

 incisures, otherwise smooth, flattened on the ventral side where 

 they rest on the host. No perceptible substigmatal ridge. Head 

 rounded, distinct, a large black patch on each lobe and one on the 

 clypeus, forming a trilobate mark. Length 1.7 mm. June i2th 

 they were 4 mm. long, dark gray-green, the sides above and below 

 the tracheal line dotted with white by transparency ; shape ellipti 

 cal, the tail a little produced and narrowed. They crawled for 

 ward on the host and applied themselves in a new place. In the 

 afternoon the host had turned black and the parasites also, but 

 they had not increased in length. June i^th they left the saw-fly 

 larva and spun cocoons in the corners of the vial. 



Mr. Ashmead has determined the parasite as a species of Pam- 

 micra. 



This note was briefly discussed by Messrs. Ashmead, Busck, 

 Stiles, and Howard. Mr. Ashmead said that this was the first 

 instance of an external feeding parasite on a saw-fly larva which 

 he had known, except one recorded in the note-books of the 

 Division of Entomology and afterwards published by himself 

 under the name of Catelytus pallipes. He knew of no pub 

 lished instance of paralysis of a larva resulting from the sting of 

 a terebrant hymenopterous parasite. 



Mr. Busck remarked that the Proctotrypid Lcelius trogodcr- 

 matis paralyzes the larva of the Trogoderma by stinging it before 

 it lays its eggs. Dr. Stiles inquired whether the parasite always 

 stings the Iarva3 in the same place, suggesting that if this were 

 the case the paralysis was mechanical ; if not, that it was prob 

 ably chemical. Mr. Busck replied that the Laelius always stings 

 the Trogoderma larva at about the base of the third pair of legs, 

 holding itself in a transverse position and inserting its ovipositor 

 under the body of the host la*rva, thus evidently piercing the third 

 thoracic ganglion. He said that the parasite would generally 

 wait nearly half an hour after stinging the Trogoderma larva, to 

 see whether the operation had been effective, and if so, would 

 then lay its eggs upon the paralyzed body. He had noticed that 



