Explanation of Plates. 



313 



examples lend themselves to good photographic demon- 

 stration ; but those selected are probably sufficient to 

 fully show the facts in question, and even to demonstrate 

 them, though not, of course, so simply as an examination 

 of actual specimens at once does. 



I add some photographs of specimens of the larvae that 

 I have had on slides for over twenty years, as well as of 

 other specimens of the same date showing the mouth parts 

 of the imago and the male genital appendages. 



These may be of assistance to those who do not care to 

 refer to the original papers already referred to. 



Explanation of Plates LXXXI — XCII. 



Plate LXXXI. Abdomen of female Micropteryx thunbergella, 



X 40, and last three segments, X 80, shows 



that no opening exists except terminally. The 



little cloud at a perhaps critical point on the 



8-9 intersegmental membrane, is a scrap of 



interior contents, not completely cleared, of 



which other portions may be seen in the two 



preceding segments. 



Plate LXXXII. Abdomen of M. calthella, x 25, and another 



specimen, x 50; in the latter the 3rd to the 



7th segments have got twisted and folded, the 



terminal segments are telescoped as in position 



of repose. Most of the preparations here 



shown were made many years ago, without 



the present use of them in view ; those here 



photographed are selected from a number as 



being most apposite. 



Plate LXXXIII. Micropteryx seppella, whole abdomen, X 25, 



and end segments, X 50. 

 Plate LXXXIV. Micropteryx calthella, $, whole abdomen, x 25, 

 last segments, x 50. By some accident the 

 specimen has got broken in the 9th-10th 

 intersegmental membrane. 

 Plate LXXX V. Micropteryx calthella, $, abdomen (with portion 

 of thorax, x 30, and M. seppella (abdomen 

 only), x 30. 

 TRANS. ENT. SOC. LOND. 1916. — PARTS III, IV. (APRIL '17) Y 



