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XV. The Structure and Life-history of Phalacrocera 
replicata. By Proressor L. C. Miaut,, 2:R.S., 
and R. Surtrorp, B.A. With an Appendix on 
the Literature of the earlier stages of the Cylindro- 
tomina, by Baron C. R. Osten Sacken, Hon. 
F.H.S 
[Read April 7th, 1897.] 
Prates VIIT.—XI. 
THE STRUCTURE AND LIFE-HISTORY OF 
PHALACROCERA REPLICATA. 
1. The form and habits of the | 6. The reproductive organs of 
larva. | the larva. 
2. The alimentary canal of the | 7. The development of the 
larva. | imaginal organs. 
3. The heart of the larva. 8. The process of pupation. 
4. The respiratory organs of 9. The pupa. 
the larva. | 10, The imago. 
5. The nervous system of the 11. Egg-laying. 
larva. | 12. Comparison with nearly- 
allied insects. 
1. The forms and habits of the larva. 
Tue larva of this Dipterous insect is sometimes abundant 
upon submerged mosses or other aquatic plants. It is, 
so far as our experience goes, a very local species. Our 
supply, which we owed in the first instance to the kind- 
ness of Mr. Henry Scherren, came from marshes between 
Pevensey and Bexhill, where the larva feeds upon a moss, 
Amblystegium exannulatum.* Fragments of this moss 
are easily recognised by the microscope in the ali- 
* Tdentified for us by Mr. M. B. Slater, F.L.S. Mr. Scherren 
gives us the following localities :—The Norfolk Broads (Hickling, 
Ormesby), the Waveney, near Beccles Bridge, marshes round 
Brightlingsea, Seaford. We have not found the insect in Yorkshire. 
Phalacrocera has been taken in France, Germany, and Sweden. It 
is said to feed upon Hypnum elodes, Fontinalis antipyretica, and 
other mosses, besides Amblystegium (formerly known as Hypnum 
Jluitans). 
TRANS. ENT. SOC. LOND. 1897.—ParT Iv.  (DEC.) 
