26 PSYCHE [February 



been mentioned under the account of that species. It is sufficiently common to 

 serve as an efficient check upon the depredations of the larvae of that species. The 

 larvae are generally killed before they are grown. My bred specimens of the 

 parasite are labeled the i8th and the 21st of June. 



9. An undescribed pteromalid, in the hands of Mr. Ashmead for description. 

 Bred from larvae of Acronyda ohlinita on the 5th of June. 



10. An undescribed pteromalid, in the hands of Mr. Ashmead for description. 

 Bred from pupae of Dalilbohmia needhami about the first of May. 



11. Coccophagus flavoscutelhim Ashmead. Bred on tlie 5th and 6th of June in 

 great numbers from the male scales of Eulecajihim armeniacum (No. 16 post), 

 which they completely annihilated. 



12. Chalcis ajuiulata Fabr. Found on button-bush stems, but not further 

 observed. 



13. Siobla excava Norton. A pair of sawflies of this species was captured 

 in July on a well isolated clump of button-bush. A number of sawfly larvae were 

 taken feeding on the same clump on the 27th of June, some of them apparently 

 grown. These larvae fed only on the young and tender leaves of the sterile 

 shoots. They were hardly gregarious, and in their feeding, they ate but a few 

 small holes in each leaf. Mr. A. D. MacGillivray determined the adults, and I 

 have supposed that the larva belong to the same species. 



Hemiptera. 14. Neurocolpus nubilis Say. This species and the two next 

 following were the only ones that appeared to be getting their living exclusively at 

 the expense of the button-bush {Acronycta oblinita fed also on the leaves of the 

 tall dock, Riiviex altisshnus, on the island). This rather prettily red-marked capsid 

 was seen feeding about the buds of the flow-ering shoots, nymphs only being 

 present in May, and adults appearing about the middle of June. Determined by 

 Mr. O. Heidemann. 



15. Aphis cephalauthi Thos. A few colonies of this aphis were found on 

 flowering shoots that overhung the water. Their bluish powdery covering gave to 

 the shoots which they thickly covered a decidedly glaucous appearance. In the 

 colonies were found foraging the larvae of the anlhomyiid (No. 22) and the cocci- 

 nellid (No. 31) mentioned below. 



16. Rnlecanium armeniacum Craw. This scale was very common during the 

 winter of 1898-99 o"n shoots of the preceding season; but it was excessively par- 

 asitized with Coccophagus flavoscutellum^ and I have not been able to hnd a specimen 

 since that season. I placed hundreds of the male scales in a proper breeding cage 

 in April, and hundreds of the parasites emerged, but not a single male scale insect. 



