18 



(3) Compsilura concinnata attacks the caterpillars of both 

 the Gypsy and the Brown tail Moths It is a tachinid, and the mother 

 fly deposits the young maggots beneath the skin of the host. The m.ag- 

 gots mature in two -weeks, when they make their exit and usually drop 

 to the ground for pupation. In another week the adults emerge ana in 

 three or four days begin producing young. This important parasite was 

 introduced in 1906 and 1907. In 1909 it was found generally distributed 

 over a considerable area, and in 191 o a marked increase in numbers was 

 noted. 



(4) Blepharipa scutellata is another tachinid of importance. 

 Its habits differ from those of Compsilura in that the eggs are deposit- 

 ed upon foliage in order that they may be devoured by the host. 



Blepharipa scutellata, adult female, enlarged (Bull. 91, U.S. Dep. Agric.) 



(5) Monodontomerus aereus, a chalcid, is a parasite of the 

 pupa of both the Gipsy and the Brown-tail moths. Curiously enough it 

 is commonly reared as a secondary as well as a primary parasite. Con- 

 sequently its status as a control factor is difficult to determine. It is a 

 secondary parasite upon tachinids audi upon Apanteles lacteicolor. 



(6) Calosoma?tsycophanta is the most effective predaceous 

 beetle against the gipsy moth. Both adults and larvae are predaceous and 

 freely climb trees in search of their prey. The eggs are deposited in the 

 earth and the full-fed larvae seek the earth again and construct pupal 

 cells. The adult beetles do not emerge until late in the spring. The 

 breeding season coincides almost exactly with the caterpillar season. It 

 is found generally distributed, is firmly established, and is increasing 

 and dispersing rapidly. 



