290 Philippine Journal of Science i»i» 



ENDELUS BAKERI KERREMANS 



The larvae of the first species were found by one of my stu- 

 dents, Mr. F. Q. Otanes, in blotch mines, singly, on the leaves 

 of the bird's-nest fern (Asplenium nidus L.) on January 27, 

 1918, and the adults emerged on February 25. 



Since they were first brought to my attention I have succeeded 

 in discovering all stages of the insect as well as the larvae, the 

 pupae, and the adults of the parasites that attack them. 



EGG 



The egg is a very flat, broadly elliptical object, with obtusely 

 rounded ends. It is 1.75 millimeters long and 1.09 millimeters 

 wide, dark chestnut brown over its discal area and pale to 

 white around its margins, which are slightly crenulate, the 

 submarginal area having a crinkled or undulated surface pre- 

 ceded mediad by a series of broad, rectangular, radiate fascia 

 more or less indistinct. Along the median line are four groups 

 of black, imbricated, subspinose prominences and an area of 

 brown stria? which, being in subparallel series, may represent 

 the area of the micropyle (Plate I, fig. 6). 



The egg is so firmly glued to the leaf that it remains long 

 after the affected leaf has died and becomes completely desic- 

 cated, and it serves as an excellent index to the beginning of 

 a mine, where the battered condition of the leaf might make its 

 discovery otherwise difficult. It is almost invariably laid on 

 the lower surface of the leaf (Plate III, fig. 1) although it has 

 been found on the upper surface of leaves near the center of 

 the plant or where very little space intervenes between succes- 

 sive leaves (Plate III, fig. 2). 



LARVA 



Length, 7.5 millimeters; greatest width, 1.8 millimeters; thick- 

 ness, 0.9 to 1 millimeter. It is pale apple green, the head being 

 ochraceous or pale buff and this color dilutes the pale green of 

 prothorax and mesothorax. The anal segment is almost white, 

 slightly tinged with buff. The body is shiny and very translu- 

 cent, so that the body fats and internal organs are plainly 

 visible. The head when at rest is retracted for four-fifths its 

 length into the broad, lobate prothorax, and is regularly cordate 

 in outline, with a very narrow, dark brown line around its 

 anterior half. The frontal suture is dark, well defined, and 

 bifurcate caudad. The trophi are ferruginous, the antennas 

 short, stout and pale, with a stout, blunt terminal spine mediad 

 and a slender seta, eight times as long, ectad (Plate II, fig. 3). 



