THE CANADIAN ENTOMOLOGIST. 151 



This species is really distinguished by its irridescent wing on which 

 the spots described stand out prominently. It differs superficially from 

 iridescens in having a spot on the hind wings and in colour of pupa case ; 

 from }ni?iima it differs in having no appreciable clouding of wings other 

 than the spots described, in shape and location of the spots, and in the 

 pupa case having but five instead of seven pairs of wax pores. The 

 darkened portions of the vasiform orifice appear as a dark spot on the 

 untreated adult. In crawling about the leaf, the female leaves behind a 

 line of fijie fluffy waxen secretion rubbed from a tuft of the same develop- 

 ing on the under side of her abdomen. Frequently her path can be 

 distinctly followed by the aid of these lines of secretions. In mating, the 

 sexes head in the opposite direction, and in this respect dift'er from those 

 species oi Aleyrodes that have come under the observation of the writer. 



This species becomes quite abundant on the Gaava at times, and 

 when not parasitized becomes a nuisance. In November, 1910, it was 

 causing noticeable blackening of the foliage at Santiago de las Vegas. 

 The sp(;cies is, however, heavily parisitized by a hymenopterous parasite 

 and the red fungus (Aschersonia aleyrodis) which the writer found gener- 

 ally present on affected leaves. Prof. Patricio Cardin, for whom this 

 species is named, sent the writer specimens in May, 1911, over 90': of 

 which had been parasitized by a hymenopterous parasite. This is the 

 species of White-fly figured by Cook and Home as an undetermined 

 aleyrodid on guava (Pi. XV, fig. 41, Bull. 9, Estacion Central Agronomica 

 de Cuba), and beyond doubt is that referred to in the Primer Inforne 

 Annual of the same station as "Guagua a mosca blanca de la guayabo." 

 Cook and Home (I.e., p 31), say that Aleyrodes howardi is the species 

 referred to, but in this they are apparently mist.iken, as the writer has not 

 found howardi except very rarely on guava. While howardi was gener- 

 ally present on orange trees close by, this species was found only on guava. 



Aleyrodes trachoides, n. sp. 



Egg. — About 0.2 mm. long. Pale in colour, smooth, without reticu- 

 lations or waxy secretions ; curved with convex side approximating leaf, 

 attached by short stalk arising from convex surface, about one-fourth dis- 

 tance from base to tip of egg. Eggs deposited promiscuously about lower 

 surface of leaf. 



Larva, a' aiv ling first ifistar. — Length about 0.27 mm., width about 

 0.14 mm.; elongate elliptical, yellowish white, with nine pairs of marginal 

 bristles and one pair cephalad on venter near margin ; the anterior and 

 two posterior pairs of marginal bristles longest. 



