I'dmo.na College Joi-hnal of Kntomoloov 595 



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"'Male — l.cnjttli .01 inch, ('olor brown ami l)rown-l)lack ; iintcnniv brown, 

 legs palf or yi'llowisli, posti-rior fcnioni slightly sliadi-d above with brown <ir black; 

 fi'ct reddish; nectaries shorti-r than in female; wings hyaline, stignial s|)ot pale. 

 These are rare among the first broods, and afterwards almost or entirely disappear. 



" 'Female — Apterous, length i) or> to ().06 inch. Hroadly ovate. Dark brown- 

 ish-black. Head between antennu* reddish; antennte seven-jointed, pale yellowish, 

 .ipical ends of joints, three, four and five brown, six shortest, seven long, setaceous; 

 legs pale yellow, latter two-thirds of the femora brownish or blackish, tips of tibia- 

 and claws brown: m-ctaries slightly thickest at base, black and cylindrical, cauda 

 di.stinct. 



"'H'iiiireil I'iviparous Female — Length !.()() inch. Color black and shining; 

 eyes red-brown, tubercles of antenna- black, vertex of head reddish; rostrum reach- 

 ing back of middle coxa-; antenna- not <)uitc reaching to tip of abdomen; alxlomcn 

 variable, brown-black, brown or olive-green; wings hyaline; stigma rather broad, 

 brown, obliquely sharpened to a point at outer edge towards ape.x ; stigmal vein 

 strongly curved, dark; three obli(|Ue veins, the third forked; hind wings with two 

 oblique veins in all specimens but one, nectaries long, cylindrical and bl.aek ; cauda 

 long and recurved, dark. 



" '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 bnM>ds upon 

 broods, or young colonies, seem to exist on all the tender new leaves and shoots, 

 and still the part henogcnetic young keep coming. X'crily, if it were not for the 

 I'lialcid Hies, ichneumons and other parasites, they would be the death of the trees. 

 Hy the iniddli- of .March a change takes place in the broods. The young differ from 

 their parents in shape, color .and size, ."^o different are they ns to discredit belief, 

 .and had I not watched them breeding day by day on my orange trees, I should have 

 felt justifii'd in describing them as a distinct species. Tln-y are undoubtedly a 

 dimorphic form, and I give below a description: 



" 'Dimorphie, I'iviparoiix, .Iplrroiix Female — Length, 0.08 to O.OJ) inch. Klon- 

 nate; color of a uniform pale pea-green with more or less of a longitudinal shading 

 of darker grei^n on the dorsum, with the surface more or less corrugated; eyes 

 bright red, with a proniini-nt facet or ocellus springing out from hinder edge of 

 ^.•lnle, giving it a tooth-like appearance; antenna- \'II jointed, pale glassy green, in 

 iii.iture specimens the tip from the fifth joint is reddish; legs of the same uniform 

 pall- green; cauda small, conical. Beak does not (|uite reach to tip of middle coxw.' 



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

 e.iti only be distinguished by having wings, the veins of which are very pale. These 

 are rare, the majority being wingless. 



"The mature viviparous femah- continues breeding .ind e.iti often be found 

 surroimded by from twenty to thirty pale green young; occasionally a brown one 

 will be found among them. These continue bri-eding for several generations, ulti- 

 mately giving place to thi- original type, and by tlu- last of .\pril 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 Trioxi/s. T. te-ttaceipes Cresson, 



