92 Psyche [April 



the writer at Piura, Peru. Three maggots were found in adults of 

 Stenomacra sp. near Umbatipennis Stal, July 27 (one in 3rd stage), 

 and July 28 (one in 2nd, and one in 1st stage), 1911. In each case 

 one maggot occurred alone in the abdomen of the host. On August 

 19, 1911, a dried puparium of the same species was found in the 

 contents of a box in which adults of this host had been placed 

 on August 1. The fly was not reared. The species is almost 

 certainly Xanthomelanodes peruanus Towns., which is very abund- 

 ant in the Piura valley, as is likewise the host. 



Anal stigmata of third-stage maggot and puparium — The anal 

 stigmatal plates are rather narrowed, not as broad as long, closely 

 approximated, well raised as on a short process; the three slits are 

 ridge-like, disposed at about 22^° angle to the long (dorso- 

 ventral) axis of the plates, rather elongate, sharp, well raised. 



3) On February 3, 1911, the writer collected 817 adults of 

 Dysdercus ruficollis Linne on cotton in the Chira valley between 

 Sojo and Macacara, picking and putting in with them at the time 

 some opened cotton bolls and keeping them alive in a fine-screened 

 wooden cage as long as they would live on mashed moistened cot- 

 tonseed, in the hope of securing parasites. This species is the com- 

 mon cotton-stainer of the Peruvian coast region. No sign of 

 muscoid parasitization was obtained from the lot other than the 

 finding on February 10 of a small muscoid puparium in the lint of 

 one of the opened cotton bolls that had been put in the cage Feb- 

 ruary 4. This puparium had transformed from a maggot that 

 had evidently escaped from a stainer to the lint of the opened 

 boll before collection. The puparium proved to be parasitized, 

 a Perilampus sp. issuing from it on March 2, 1911. Mr. H. S. 

 Smith's recent investigation of the planidium stage of Perilampus 

 shows that it enters the muscoid maggot while the latter is still 

 in situ within the body of its host. This explains the finding of the 

 present parasitized puparium within a cage which the adult of 

 Perilampus could not have entered. The hyperparasite was de- 

 termined by Mr. J. C. Crawford. The puparium was probably 

 that of Acaulona peruviana n. sp. It was sent in with the reared 

 hyperparasite. 



My assistant, Mr. E. W. Rust, had better success in rearing the 

 fly in 1912. From 594 adults of D. ruficollis collected at various 

 dates during the last week of September and the first week of Octo- 



