256 PROCEEDINGS OF THE ACADEMY OP 



Fig. 18, forceps of Gnophomyia tristissima, from above, and half open; 

 18a, female ovipositor of the same species. 



Fig. 19, half of the forceps of Erioptera vespertina, side view. 



Fig. 20, forceps of Erioptera arm ata from above. 



Fig. 21, the same, from the side. Its structure is somewhat complicated ; 

 besides the coriaceous parts dd, there are two pairs of horny appendages at- 

 tached to them ; they are invisible from above, except the tip of one of them, 

 which projects at/. One of these appendages is seen at h in fig. 21 ; detached, 

 it looks somewhat like fig. 21a, in which the portion 666 is closely applied to 

 the inside of the lobe d, and the portion c branches off. The other pair of ap- 

 pendages (ee ou fig. 21) is slender and curved ; each of them is attached to one 

 of the lobes dd. 



Fig. 22, forceps of Erioptera caloptera Say, from below. 



Fig. 23, forceps of Erioptera v e n u s t a from above. 



Fig. 23a, the same from below ; the horny appendages aa, seen from below, 

 appear double, consisting of the horny part 66, and a membranaceous appendage 

 cc ; fig. 236 represents it detached ; its margin d is horny, the rest is a thin 

 membrane ; these two appendages are not closely applied to each other, and 

 have an interval between them, although they move simultaneously. 



Fig. 24, forceps of Limnophila luteipennis, from above aa, two pairs of 

 moveable falciform appendages ; the outside ones are horny, the inside one 

 seems to be of a softer consistence and are ciliated. 



Fig. 25, forceps of Limnophila aprilina from above; structure almost 

 like the preceding ; the outside appendages have a longitudinal notch, (fig. 

 256.) 



Fig. 26, forceps of Limnophila ultima from below; outside, horny ap- 

 pendages are slightly hooked at the tip. 



Fig. 27, forceps of Limnophila rufibasis from above, open; the append- 

 ages aa are large and strong, serrated inside ; bb are also horny, and look like 

 fig. 27a; the point c is directed upwards; 276 is a slender, horny organ, situated 

 inside of the forceps, and concealed when it is closed ; its structure is perhapa 

 analogous to a similar organ inDicanoptycha (fig. 12a) ; the same organ 

 is more or less distinctly seen in almost all other species. 



Fig. 28, forceps of Limnophila montana from above, closed; it is dis- 

 tinguished at once by the position of the appendages, which is peculiar to this 

 species ; aa are the tips of internal horny organs ; they protrude, together with 

 the soft part/, when the forceps are opened. 



Fig. 28a, the same from the side ; a is the same as in fig. 28. 



Fig. 29, forceps of Symplecta punctipennis from above ; a and b are 

 horny. 



Fig. 30, forceps of Arrhenica s p i n o s a from above ; a horny, 6 soft ap- 

 pendage ; cc internal forceps, (fig. 30a represents it detached) ; at a* is a joint, 

 by means of which this forceps is opened or closed. 



Fig. 31, forceps of Eriocera fuliginosa from above; aa are horny; 66 

 soft ; c is curved downwards, like fig. 276. 



Fig. 32, forceps of Amalopis inconstans, from above and half open. It i3 

 difficult to convey an idea of this organ by a drawing, the points/, g and h 

 being all curved and directed upwards ; aa are horny ; 66 soft ; cc coriaceous, 

 hollow inside ; h is figured separately, (326) ; the point/is bifid, (32a). 



Fig. 33, forceps of Bittacomorpha cl a v i p e s from below. 



Fig. 33a, the same, from above. 



Fig. 34. forceps of Cladura flavoferruginea, from the side ; a is convex 

 and seems to be hollow inside ; the concavity can be seen at 6 ; cc is the for- 

 ceps. This figure is a very rough sketch, drawn from a dry specimen and 

 may not, for this reason, be quite accurate. 



[Aug. 



