310 HARRISON G. DYAR. 



Woods Holl, Mass., and on sugar plum (Amelanchier), willow 

 and strawberry at Jefferson, N. H. 



It will be noted that this hirva is widely different from the one 

 described by Norton as H. McLemji, and also from the one which I 

 have recently desci'ibed under the same name in the " Canadian 

 Entomologist." The hitter larva is marked by the letter S in my 

 notes, the present one by 2L. The flies were sent to Mr. Marlatt, 

 who confirms my determination saying " your specimens labeled S 

 and 2L are unquestionably McLeayiy 



Apparently, in this genus, there are three species produced from 

 one larva {pectoralls, seaptdaru and cwraleaii) and three lai'vee which 

 produce one species of imago (McLeayi). 



I want to call attention to this curious problem in order to induce 

 others to assist in investigating it. I may state that the larvae which 

 produced McLeayl were bred in different years, so that it is highly 

 improbable that there could have been any confusion. Moreover, 

 they were fed in small jars on single leaves, so that other larvse 

 could not have been accidentally introduced without discovery. 



Stroiigy logasler Koriciilatiis Provancher. Larva. — Head whitish, with 

 sordid testaceous tinge, shiuiug, eye black, mouth brown ; some with an obscure 

 brownish shade at vertex, or a black patch behind eve and a large one on vertex. 

 Body not shining, whitish waxy, api)earing green, except subventrally, from the 

 food showing by transparency ; in later stages actually green ; segments finely 

 6-7 annulate; spiracles dark, tracheal line white; feet on joints 6-13. 



Found on the common brake {Pteris aquUina) solitary, sitting flat 

 on the venter, or on the edge of a leaf. Pupa form in a cell bored 

 in soft wood. 



^Stroiigylogaster annulosu!^ Norton. 



Not distinguished from the preceding and occurring on the same 

 food-plant. Some of the variations above noted and referred to 

 individual differences are probably really of specific value. 



*Strongylogasler luctiiosu!i$ Provancher. — Head shining whitish with 

 a brown tint, eye and mouth dark ; a black shade behind the eye, touching it ; a 

 neat, shining, black patch on the vertex, pointed anteriorly and reaching the 

 clypeus, where it enlarges a little; width 2.4 mm. Body neatly annulate, light 

 emerald-green doreally, waxy whitish on joint 2 anteriorly, joint 13, subventrally 

 and on the feet; last two joints of spreading thoracic feet black tipped ; a pair 

 of black patches at base of anal plate, and a series of little orange ones below the 

 black spiracles on joints 3-12. Body slightly shining. 



Found with the preceding at Keene Valley, N. Y. ; also on Pteris 

 at Jefferson Highlands, N. H. 



* Determined by Mr. A. D. MacGillivray. 



