116 



PAPEKS OK" CEKEAL AND FOKAGE INSECTS. 



which is bluntly oval, mottled with brown, and measures 6.53 mm. 



in length. 



On August 27 a dead larva of the alfalfa looper with a mass of 



hymenopterous cocoons fastened to it (PI. XI, fig. 1) was found 



in an alfalfa field in Pullman, Wash. 

 The cocoons were enveloped in a loose, 

 white, silken ball 18* mm. in diameter. 

 On August 29, 34 specimens of Apantetes 

 liyslopi Vier. (fig. 49) emerged from this 

 mass. 



Ameloctonus n. sp., determined by Mr. 

 H. L. Viereck, was reared from the larva 

 of this moth at Salt Lake City, Utah, in 

 1911, by Mr. T. H. Parks, of this office. 

 The cocoon of the parasite was spun on 

 August 17, and the adult parasite emerged 

 on August 23. 



One of the alfalfa looper larvae in the 



insectary rearing cages started to spin a cocoon on January 11, 1909. 



On examining the cocoon two days later it was found to contain 



puparia of Plagia americana Van der Wulp, one entirely and one 



partly within the dried larval skin. On July 23 one adult emerged, 



a 



Fig. 48. — Cocoons of alfalfa looper 

 parasites : a, Microplitis sp. ; 

 bj Sargaritis websteri; c, Micro- 

 plitis alaskensis. Enlarged 5 

 diameters. (Original.) 



Fig. 49. — Apanteles liyslopi, a hymenopterous parasite of the alfalfa looper. 



enlarged. (Original.) 



Greatly 



and on either July 24 or 25 another emerged (fig. 50). Several more 

 of these flies were reared, and the number that would emerge from a 

 larva was always directly associated with the size of the larva. A 

 very small larva in our cages produced one fly, a medium-sized larva 

 two, and a full-grown larva produced five of these parasites. 



