THE ALFALFA LOOPER IN PACIFIC NORTHWEST. 115 
On July 29, 1909, a larva was observed with a cocoon fastened 
between the middle and anal prolegs (Pl. XI, fig. 3). The moth 
larva was still alive, though unable to move from the cocoon, and died 
the following day. On August 1 an adult hymenopteron, IMicro- 
= = ro a 
— 


Fic. 46.—Rhogas autographe, a hymenopterous parasite of the pupal stage of the alfalfa 
looper. Greatly enlarged. (Original.) 
plitis alaskensis Ashm., emerged from this cocoon. The cocoon 
of this parasite (fig. 48, ¢) is pale green, 5 mm. long, cylindri- 
cally ovoid, and slightly pointed at the anterior end. In emerging 
the adult very neatly cuts a cap from the anterior end, this cap 
often remaining fastened to the co- 
coon by a few threads. On August 
12 another larva was found bearing 
one of these cocoons, and on August 
14 an adult parasite emerged. 
Microplitis n. sp., determined by 
Mr. H. L. Viereck, was reared from 


bY 
the larvee of these moths on June 28, rye. 47.—Larval skin of alfalfa looper 
1910. This parasite spins a tan- from which Rhogas autoygraphe has 
] d ii a 353 issued: a, Dorsal aspect; 6b, lateral 
eoloreaq cocoon which measures 05.0; aspect. Enlarged 6 diameters. (@rig- 
mm. in length (fig. 48, a). inal.) 
Sargaritis websteri Vier. is one of the most numerous parasites of 
the alfalfa looper at Pullman, Wash. The first specimen obtained 
emerged on August 14, 1909. The following year specimens emerged 
June 21, July 5, and July 25. This species spins a cocoon (fig. 48, b) 
