PARASITIC DIPTERA. 387 



other caterpillars taken in the field, and bearing Dipterous 

 eo-o-s, were fed and carried through their transformations 

 with the same result as in the case cited above. 



All the Dipterous parasites bred from the gypsy moth, 

 and also those collected in 1891, were sent to Dr. S. W. 

 Williston for determination. They were determined by 

 him as follows : — 



Exorista, two species ; Phorocera, four species. These 

 are true parasites. 



Gaurax anchont Loew, whose larvie had been observed 

 by Osten Sacken in multitudes upon the pupte enclosed in 

 the cocoons of the Cecropia moth ; Pliora scalaris Loew ; 

 Phora incisu7^alis Loew, var. The last three species are 

 regarded by Dr. "Williston as accidental parasites entering 

 the pupre of the gypsy moths while the flies are in the larval 

 state, and then feeding in and destroying the moths. 



SarcojyJiaga, two species. Schiner expresses very grave 

 doubts whether the species of SarcojjJiaga ever feed on any- 

 thing but dead animal matter, while Brauer states that their 

 larvtE are sometimes parasitic. 



Cyrtoneura stahiilans Fall. According to Hartig and 

 Bremi, the larva of this species is sometimes found in the 

 caterpillars of certain Bombycid moths. 



In 1894, I sent another lot of Diptera bred from the gypsy 

 moth to Dr. Williston for determination, and in reply he 

 wrote as follows : "I send you herewith the manuscript on 

 the Diptera sent me, except a portion of that formerly sent 

 to you, the specimens of which have got mislaid or rather 

 lost in the general collections, and have not yet been found. 

 There were several specimens, how many I do not know, 

 but not including the Tachinids which I had separated out." 

 Should the above-mentioned species be found, there may 

 prove to be something of interest to add to our list. Dr. 

 Williston kindly sent the folloAving descriptions for publi- 

 cation in this report : — 



Achcetoneura fernaldi n. sp, (Plate 53, Fig. 11, a-e.) 

 Male. — Frontal stripe deep brown, a little narrower than 

 the sides of the front; sides light golden yellow, reaching 

 a little way on the sides of the face. At each angle of the 



