THE NATURAL ENEMIES OF THE CITRUS MEALY BUG II 271 



is longer than article III. Mandibles bifurcate at the point, with a long curved 

 tooth near the base of the inner margin. Maxillary-palpi appear really four- 

 articled. Article III (the apical according to Dimmock) is much longer 

 than the article II or I, and is much narrower. Labial-palpi two-articled; ar- 

 ticle I wider and shorter than II. Thorax gradually growing wider from the 

 head to the first abdominal segment. Prothorax much wider, and longer than 

 the head. With large spine area on each half and a rudimentary lateral area. 

 With a lighter streak on middle of dorsum. Mesothorax wider and shorter 

 than the prothorax; with spine areas the same, but not so large. Metathorax 

 slightly wider than the mesothorax, but little longer. Spine areas the same. 

 Abdomen nine segmented, the second being the widest and the ninth very 

 much the smallest. Legs short and stout. Coxje much longer than broad, 

 longer than femur or tibia. Trochanter normal. Femur nearly co-equal with 

 tibia. Claw well curved with enlargement at the base. 



The larvre are to be found in great numbers in the egg masses of the 

 mealy bug, or crawling aliout on the tree. This stage may be found at any 

 season of the year, although in no great numbers during the winter months. 

 During the months of October, November, and December, they are present 

 in the greatest numbers and do the most work. The work is done very 

 slowly and while the larvre appear in great numbers it is difficult to see the 

 results. This is probably due to the fact that they move about very little 

 and their food requirements are not as great as for the more active species. 

 It was noticeable that great numbers were trapped by tanglefoot bands on the 

 trunks of the trees, where they usually collect in the greatest numbers and feed 

 upon the egg masses here, rather than upon the fruit, although they are 

 found on all parts of the tree. This insect was introduced for l)lack scale 

 (Saissctia olcac). but it seems to prefer the mealy bugs when they can be 

 had. I have seldom found them working on the black scale which infested 

 trees covered with the mealy bug. So far the only enemies known are the 

 Green Lace-Wings (Chrysopa) which destroys many of the younger larvae. 



Pupa (Fig. 108 B) — The nymph is covered with the dark spiny skin of 

 the larva. .Average length, 4 mm. ; average width, 2.5 mm. Color same as the 

 larva. Surface of body smooth, but covered with short spines or hairs. Anal 

 appendages peculiarly the shape of a human foot, with the toes turning in. 

 The nymphs appear in the greatest numbers during the later months ( Novem- 

 ber, January,) and are very scarce during the months of June and July. 

 The moult lasts from two weeks to one month, and occurs in a hidden 

 protected place under the bark, in curled leaves, or any such favorable places. 

 Where sacks were tied around the limlis to prevent wire stays from cutting 

 into the bark, great numlicrs of this stage were found hiding underneath the 

 sacking. 



The greater percentage of the nymphs develop normally. I have never 

 found any partially developed forms. 



Adult (Fig. 108 C) — Slightly oval to nearly round in form. Color, 

 black, but due to the pubescent covering, often appears grayish, shiny and 

 sometimes appearing to be slightly mottled. The abdomen is salmon-colored. 



