92 .THE CANADIAN ENTOMOLOGIST. 



I have watched these viviparous females breed on my orange trees, 

 and the rapidity with which this is done is simply astonishing. In a few 

 days broods upon broods, or young colonies, seem to exist on all the 

 tender new leaves and shoots, and still the parthenogenetic young keep 

 coming. Verily, if it were not for the chalcid flies, ichneumons and other 

 parasites, they would be the death of the trees. By the middle of March 

 a change takes place in the broods. The young differ from their parents 

 in shape, color and size ! So different are they as to discredit belief, and 

 had I not watclied them breeding day by day on my orange trees, I should 

 have felt justified in describing them as a distinct species. They are 

 undoubtedly a dimorphic form, and I give below a description : 



Dimorphic, viviparous, apterous female.— Length .08 to .09 inch. 

 Elongate ; color a uniform pale pea green, with more or less of a longi- 

 tudinal shading of a darker green on dorsum, with the surface more or 

 less corrugated ; eyes bright red, with a prominent facet or ocellus spring- 

 ing out from hinder edge of same, giving it a toothed like appearance ; 

 antennae 7 -jointed, pale glassy green, in mature specimens the tip from 5th 

 joint is reddish ; legs of the same uniform pale green, with only feet red ; 

 abdomen at tip somewhat pointed ; nectaries very long and thin, slightly 

 curved, slightly swollen in middle, and pale green ; cauda small, conical. 

 Beak does not quite reach to tip of middle coxae. 



The winged form agrees in every respect with above description, and 

 can only be distinguished by having wings, the veins of which are very 

 pale. These are rare, the majority being wingless. 



The mature viviparous female continues breeding and can often be 

 found surrounded by from 20 to 30 pale green young ; occasionally a 

 brown one will be found among them. These continue breeding for 

 several generations, ultimately giving place to the original type, and by 

 the last of April none can be found. Why this change of form occurs is 

 yet a mystery, and needs further investigation. Towards the end. all seem 

 to be parasitized by a Trioxys, T. testaceipes Cresson, which thoroughly 

 eradicates them. 



34. 6". solaiiifslii, n. sp. 



Wingless female. — Length .12 inch. Elongate ovate and of a pale 

 yellowish green color ; beak short, not reaching middle coxae, pale, tip 

 black ; antenna 7-jointed, slightly reaching beyond abdomen, situated on 

 large tubercles, pale greenish, joints infuscated, 6th joint shortest, dark, 



