228 Benj. D. Walsh on the Insects inhabiting the Galls 



from the Cynipidous gall Q. ficus Fitch of the same year's growth. 

 From another Cynipidous gall of the last year's growth, Q. prunus 

 Walsh, I bred May 26 1 % 1 9 of an undescribed Gecidomi/ia about 

 the size of orbitalis Walsh. I believe that these two and a third already 

 mentioned by me (Proc. etc. Ill, p. 549) are the only recorded cases 

 of CecidomyidEe being inquilinous in Cynipidous galls. 



G. Diplosis septemmaculata Walsh. — I bred a single 9 August 

 23rd from recent Black -knot found on the wild plum. From the Coc- 

 cidan gall Vitifolise Fitch (see the Practical Entomologist I. pp. Ill 

 — 2, and II. p. 19.) I bred Aug. 12 — 20 3 % and very numerous 9 9 

 of this species. Hence, if I am correct as to the fungoid nature of 

 Black-knot, (see Practical Entomologist I. pp. 48 — 51,) the same Guest 

 Gall-gnat sometimes on the one hand breeds in Cecidomyidous or Coc- 

 cidan galls, sometimes on the other hand breeds in a fungus, when, 

 properly speaking, it ceases to be a Guest Gall-gnat. 



On p. 562 of the first part of the Paper, I called in question certain 

 supposed assertions of Harris and Fitch, as to the larva of Gecidomyia 

 transforming gradually into the pupa state, by a kind of budding pro- 

 cess, without moulting the larval integument, quoting Harris's book 

 as authority. It now appears that Dr. Fitch's views on this subject 

 must have been misunderstood by Dr. Harris, or else that they have 

 been subsequently modified. For in the 3rd volume of the A 7 ". Y. 

 Reports (p. 65) all that Dr. Fitch asserts is, that the larval integu- 

 ment in Gecidomyia is shuffled off towards the tail of the future pupa, 

 and is there "broken into shreds and flakes which the motions of the 

 pupa cause to separate and drop off," though on the back of the 

 insect " he was unable to detect any exfoliation whatever.'' Thus 

 nearly the whole peculiarity of the process reduces itself to this, that 

 instead of the larval integument beins; moulted whole, as with almost 

 all other insects, it is moulted piecemeal. I can readily believe this to 

 be so with the Willow Gecidomyia, because I have never detected in 

 their pupal cocoons any complete integument. But in the case of a 

 large undescribed species of Diplosis (Z>. ludinnthi-bulla Walsh MS.,) 

 which makes a globular sessile hollow gall about the size of a large 

 pea on the leaves of Heliauthus, I have repeatedly found in the gall 

 along with the pupa a complete larval integument, as large in com- 

 parison with the size of the insect as that of any Lepidopterous pupa. 

 In this particular case, therefore, the larval integument cannot be 

 moulted piecemeal. 



