308 journal of economic entomology [vol. 6 



Parasites and Predaceous Enemies 



In Piura the following hymenopterous parasites are at work on the 

 weevil during the subhumid season : 



Triaspis vestiticida — Well distributed and most abundant of all 

 the enemies of the weevil in the Chira and Piura valleys. This species 

 alone kills over 12 per cent of the weevil in Piura, while all the other 

 parasites together only raise the percentage of weevils killed by para- 

 sites to short of 17 per cent. 



Mierobracon vestiticida — More or less distributed in both valleys, 

 and more numerous than any of the remaining parasites but less than 

 one sixth as numerous as the preceding. 



Ceramhycobius townsendi — Sparingly distributed in both valleys, 

 and only a little more than half as numerous as the preceding species. 



Cerambycobius peruvianus — Very rare. Chira valley. 



Catolaccus townsendi — Small numbers in both valleys, h\ii principally 

 in the Piura valley. 



Eurytoma piurce — Still smaller numbers than preceding, in both 

 valleys. 



The determinations of the above are by Mr. J. C. Crawford (Chal- 

 oidoidea) and Mr. H. L. Viereck (Ichneumonoidea). 



The following species of hymenopterous parasites have been reared 

 from lots of weevil-infested squares and bolls from the Piura region, 

 and while the probabilities are that they are parasites of the weevil 

 they are not yet positively known as such : 



Mierobracon sp. — One from each valley. 



Cantharoctonus stramineus — New genus and species. Two from 

 lower Chira valley. 



Daictimorpha peruviana — New genus and species. Three from the 

 Piura valley at Catacaos. 



Encytince — An undescribed new genus and species. One from each 

 valley. 



Rogas sp. — Three from three separated points in the Piura valley, 

 and two from the Chira. 



Pseudapanteles sp. — One from lower Piura valley 



Chelonella iownsendi — Four from the middle Chira valley. 



Determinations are by Messrs. Crawford and Viereck. 



From several lots totaling less than 400 infested squares collected 

 in the upper and lower Casma valley, April 1 to 7, 1912, there were 

 secured 455 weevils and not a single parasite. This seems very strange. 

 It certainly indicates that parasites of the weevil were practically 

 inactive, if present at all, in the Casma valley during the first week 

 of April, 1912, while the weevil was highly active. As parasites of 

 the weevil are known from the Luna region, it seems hardly possible 



