46 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



the larvae of the grape-berry moth, but be failed to rear the adult 

 parasites from them. 



. During his studies of this insect covering the seasons of 1903 and 

 1904, Prof. Slingerland reared six different kinds of parasites of the 

 grape-berry moth, which he considered an unusually large number. 

 Four of these were ichneumonids and two were braconids. These 

 rearings by Prof. Slingerland are quoted as follows : * 



Bracon scrutator Say. (Boston Journ. Nat. Hist., I, 254). The maggot of this little 

 Braconid parasite seems to feed externally on the nearly full-grown caterpillars of the 

 second brood at work in the green fruit in August. Their little, white cocoons are 

 spun in the infested berries. The adults emerged in about two weeks on the following 

 dates: Aug. 28, Sept. 1, 4, and 10. 



Baihymetis sp. near tcrminalis Ashm. We reared two females of this comparatively 

 large parasite from hibernated pupa? on May 31. The grape-berry moth caterpillar 



Fig. 16.— Thymaris sling erlandana, a common parasite of the grape-berry moth. Enlarged. (After Sling- 

 erland.) 



had pupated and the parasite's cocoon filled that of its host. Dr. Ashmead reports our 

 specimens as probably undescribed, but possibly terminalis, which was described 

 from a male only. 



Glypta animosa Cress. (Trans. Am. Ent. Soc, III, 154). One specimen of this 

 Ichneumon emerged from an over- wintered cocoon on June 4. It spun a very thin 

 cocoon and had evidently killed the caterpillar, as no trace of a pupa was found. The 

 recorded hosts of this parasite are Psedisca scudderiana, two other Tortricids and a 

 Pyralid. 



Glypta vulgaris Cress. (Trans. Am. Ent. Soc, III, 157). Two specimens of this 

 common parasite emerged on August 25 and 27 from thin, white cocoons nearly filling 

 their host's cocoon in a wild grape. Like Glypta animosa, this species evidently kills 

 the caterpillar, but it works on the summer brood. It is also parasitic on a species of 

 Gelechia and on a Pyralid (Margaronia quadristigmalis) . 



i Bui. 223, Cornell Univ. Agr. Exp. Sta., pp. 52-53, 1904, 



