2156. SUBFAMILY ALEYRODINAE—QUAINTANCE d BAKER. 367 



The dorsum is provided with four long sublateral bristles, two of 

 wliich are situated upon the posterior part of the head and the other 

 two upon the second abdominal segment. The margin of the body- 

 is very finely crenulate and is provided with 16 bristles on each side 

 and arranged as can be seen in figure 8. In the anterior submargmal 

 part at the side of the fii-st bristle there exists another bristle a little 

 shorter than the adjommg one. The operculum is a Httle wider 

 than it is long, and a little shorter than the lingula. 



The antennae (fig. 9, No. 1) are composed of the three joints, the 

 first of which is short and the second a little longer; the third is thin 

 and about five or six times as long as the second, and ends in a short 

 bristle which might also be considered as 

 a rudimentary fourth joint. The third 

 joint is also provided near the apex with 

 a small external spur to the angle upon 

 which there is attached a very short 

 bristle. Corresponding to this part of 

 the antennae we have not been able to 

 distinguish a division, in contradistinc- 

 tion to that observed by TuUberg * and 

 by Tragardh ^ in the larvae of other 

 Aleurodes. 



The legs (fig. 9, No. 2) are short, scarcely 

 reaching, if spread out, the margin of the 

 body, with aU the joints distinct. The 

 tibia carries on its superior surface a Httle 

 short of the apex a bristle which some- 

 what exceeds the combined length of 

 both tibia and tarsus. The tarsus con- 

 sists of one joint only, and it has always 

 seemed to be more or less distinct from the tibia, and much shorter 

 than the latter. The tarsus is provided with an external apical 

 bristle which is longer than the tarsus itself. The pretarsus is short, 

 slender, and widened at the extremity. 



The larva of the first stage after it has attached itself begins to 

 secrete white wax ail along the margin of its body (fig. 10, No. 1), 

 around the dorsal bristles, and in the space between the anterior dorsal 

 bristles. 



Around the body the marginal wax forms a fringe having a width 

 of 0.042 mm. around the dorsal bristles; internally it forms a kind of 

 sheath, and between the dorsal bristles a kind of small plate ("lamin- 

 netta"). 



Larvae of the second and third stages. — These two larvae when they 

 have scarcely emerged from the skins respectively of the first and 



Fig. 9.— Aleurolobus olivinus. 

 Steuctukal details of just hatch- 

 ed larva: 1, Antenna; 2, leg; 3, 

 antenna of pupa case; 4, third leg 

 OF PUPA CASE. (After Silvestri.) 



Arkiv for Zoologi, vol. 3, 1907, No. 26. 

 •■ Zeitschr. Wiss. Insectenbiologie, vol. 4, 1908, pp. 296-297. 



