NO- 136-2. ALEYEODIDS OF CALIFORNIA— BEMIS. 529 



Cotf/j)e.s.—^o. Ti<»i. r.s.N.:\i. 



This is an introduced species and is a coninion pest in the consei'va- 

 tories of San Francisco, C/alifornia. The descril)ed specimens were 

 reared on a fern. Acro^ficlnmi capensf^ which was oixcn to the author 

 hy Superintendent McLaren, of Golden Gate Park. San Francisco. 

 A\'hen the jihint was removed to tlie laboratory it had onlv a verv 

 moderate number of the Aleyrodes ujxtn it. but within a year the 

 under surfaces of the fronds were incrusted. The plant had from 

 14 to ;><> fronds, some of which Avere over H feet in height and 

 <livided into innumerable leaflets, altogether making considerable space 

 to be covered. 



Observation of this plant was kept from February "2.. I'.too, to May 

 28. i!H)l.and (hiring that time all stages could be found. In December 

 and January there Avere bui few adults. At this time the pupal stages 

 were most in evidence, while in March. April. Septeml)er, and Octo- 

 l)er the adults arose in clouds whenever the plant was disturbed. It 

 was not possible to determine the numl)er of broods as the leaflets 

 were so minute and withered as soon as taken from the plant; when 

 dry they rolled up tightly and could not be examined without ))reak- 

 iiig into bits. 



Specimens were taken from various plants in the conservatories 

 mentioned as well as from the lalioratorv plant. 



Upon the Aerosf/clnoit cajjcnse kept in the laboratory there were 

 also found at various times a few minute larva? which were very difler- 

 ent in appearance from those of ^1. e.rtrdnirns. Although a careful 

 watch was kept for other stages, none were found which difl'ered from 

 A. e.draniens, though the young larvte were in evidence during the 

 entire time the plant remained under observation (tig. 67, Plate 

 XXXVI). 



Lanm. — Length, about O.'lo mm.; width, about 0.15 nun. Shape, 

 subelliptical, narrowed at both ends, broadest across the mouth parts. 

 Color, an opaque, grayish green. Dorsum convex, and with a pair of 

 tapering, sharply pointed spines nearly one-half as long as larva. 

 These spines are inserted meso-cephalad of the antenna', and in the li\- 

 ing larva' are borne in an almost upright ])osition. There is a narrow 

 marginal rim which bears seven pairs of rather long lateral seta', one 

 pair of longer latero-caudal seta\ and one pair of long, tapering, stout 

 s})ines. all of which are inserted in conspicuous tuliercled bases. The 

 lateral seta^ extend caudad about two-thirds the length of the larva, 

 and w itli the exception of the lirst two pairs, which are closer together, 

 they are evenly spaced. On the ventral surface o]:)posite the point of 

 insertion of the latero-cephalic spines, there arises a similar pair of 

 seta'. Abdominal segmentation distinct, the sutures extending to 

 margin, the more caudal ones strongly reflexed. 



Vasiform orifice subcin-ular and with a straight cephalic margin 

 caudally bounded by a dark, raised rim. Operculum relatively the 



